Data Communication And Networks 01

1. Data can be either

1. Images
2. Numbers
3. Words
4. All of these

2. The word ‘Data’ is derived from

1. Latin
2. Contextual
3. DB
4. None of these

3. How many types of data are

1. 1
2. 2
3. 3
4. 4

4. The types of  data are

1. Qualitative
2. Quantitative
3. Both a & b
4. None of these

5. Data are taken as ________ level of abstraction

1. Highest
2. Middle
3. Lowest
4. None of these

6. Information are taken as ________ level of abstraction

1. Highest
2. Middle
3. Lowest
4. None of these

7. Knowledge are taken as ________ level of abstraction

1. Highest
2. Middle
3. Lowest
4. None of these

8. The quantitative data is expressed in

1. Numerical form
2. Non-numerical form
3. Both a & b
4. None of these

9. The qualitative data is expressed in

1. Numerical form
2. Non-numerical form
3. Both a & b
4. None of these

10. The qualitative data may be

1. Things
2. Words
3. Text
4. None of these

11. Which type of data is hard, rigorous, credible and scientific

1. Qualitative data
2. Quantitative data
3. Both a & b
4. None of these

12. Which data are rich, poor, tall, short, good, bad, better

1. Qualitative data
2. Quantitative data
3. Both a & b
4. None of these

13. Data type is thought of as a set of

1. Values
2. Operations on values
3. Both a & b
4. None of these

14. Data type as defined in programming language are

1. Integers
2. Floating-point numbers
3. Characters
4. Alphanumeric strings
5. All of these

15.  The smallest addressable unit of data is defined as a group of ___ bits is known as a byte:

1. 4
2. 8
3. 16
4. 32

16. The unit processed by machine code instructions is called a _______

1. Word
2. Number
3. Bit
4. Byte

17.  The machine code unit may be _________ depending on the computer architecture:

1. 8 bit  or 16 bit
2. 16 bit  or 32 bit
3. 32 bit  or 64 bit
4. 64bit  or  128 bit 

18. In a 32-bit word it can represent unsigned integer values ranging from

1. 0 to 2³² -1
2. -2³¹ to 2³¹-1
3. 0 to 2⁶⁴ -1
4. 0 to 2³¹ -1       

19. In a 32-bit word it can represent signed integer values ranging from

1. 0 to 2³² -1
2. -2³¹ to 2³¹-1
3. 2³¹ to 2⁶⁴ -1
4. 0 to 2³¹ -1       

20. A signal is an

1. Electric current
2. Electromagnetic field
3. Electronic current
4. Both a & b

21. A signal is used to convey data from
1. One place to another place
2. One system to another system
3. Both a & b
4. None of these
22. In case of PSTN, signaling between

1. A telephone user
2. The telephone network
3. Both a & b
4. None of these

23. A channel is defined as a path between

a.       Transistor and receiver

b.      Transmitter and transistor

c.       Transmitter and receiver

d.      None of these

24. The path of channel may be

1. Physical
2. Logical
3. Both a & b
4. None of these

25. The path of channel may be

1. Hard wired
2. Wireless
3. Both a & b
4. None of these

26. Noise of channel noise___________ the quality of information and data

1. Upgrades
2. Degrades
3. Both a & b
4. None of these

27. In channel , the information may not be
1. Reproduced
2. Reach the receiver at all
3. Both a & b
4. None of these
28. In channel noise, data by affecting communications and files of all types including

1. Images
2. Audio
3. Text
4. Programs
5. Telemetry
6. All of these

29. Information and data may be treated as a signal in either

1. Electrical form
2. Electromagnetic form
3. Both a & b
4. None of these

30. The noise may be classified as ______________ based upon the sources

1. Internal
2. External
3. Both a & b
4. None of these

31. The noise generated because of electricity or atmospheric disturbances is of the order of

1. 300kHz
2. 300MHz
3. 300GHz
4. 300Hz

32. The noise generated which is lower than the high frequency range of ____ and may have more interface with the signal of information:

1. 300MHz
2. 300kHz
3. 300GHz
4. 300Hz

33. External noise is generally picked up from electrical appliances existing ____________________
1. In the vicinity
2. From the atmosphere
3. From electrical transformers
4. Also from outer space
5. All of these
34. Internal noise is generated in the

1. Channels
2. Receivers
3. Transmitter
4. Both a & b

35. Internal noise is less dependent on frequency, but has a significant effect at:

1. Higher frequency
2. Low frequency
3. Middle frequency
4. No frequency

36. External noise has _______ effect on higher frequencies

1. More
2. Less
3. No
4. None of these

37. Internal noise is fairly low in case of
1. Digital signal processing
2. Fiber optics technology
3. Both a & b
4. None of these
38. Noise is measured in terms of the signal to noise ratio

1. S/N
2. SNR
3. S/M
4.  Both a & b

39. The unit of noise is

1. decibels
2. Hertz
3. Micron
4. bits per second

5.  
39. ____________ defined as the size of the range of frequencies that can be transmitted through a channel
1. Channel Bandwidth
2. Channel Data Transmission Rate
3. Channel noise
4. Channel capacity
40. In other words channel bandwidth may be define it as the volume of information per unit time that a _____________________

1. Computer
2. Person
3. Transmission medium can handle
4. All of these

42. Channel Bandwidth is measured in

1. decibels
2. Hertz
3. Micron
4. bits per second

43. Bandwidth is expressed as data speed in ___________ digital systems:

1. decibels
2. Hertz
3. Micron
4. bits per second

44. In analog systems, bandwidth is expressed as the difference between the

1. Highest frequency
2. Lowest frequency
3. Both a & b
4. None of these

45. __________ is determined by the maximum number of bits that can be transmitted per unit time through the physical medium:
1. Channel Bandwidth
2. Channel Data Transmission Rate
3. Channel noise
4. Channel capacity
46. Channel Data Transmission Rate is measured in

1. decibels
2. Hertz
3. Micron
4. bits per second

47. Which gave the maximum data rate of a noiseless channel
1. H.Nyquist in 1924
2. H.Nyquist in 1934
3. Peter Sain in 1932
4. None of these
48. Channel latency depends on the
1. Signal propagation speed
2. Media characteristics
3. Transmission distance
4. All of these
49. _____________ is the amount of time that is needed for the information to propagate from the source to destination through the channel:
1.  

2. Propagation time
3. Channel Latency
4. Channel Utilization
5. Both a & b

50. Throughput may be defined as the number of _______________ through a data communication system over a period of time:

1. bits
2. characters
3. blocks passing
4. All of these

51. ___________ may be defined as range of frequencies assigned to a channel

1. Bandwidth
2. Channel noise
3. Bit rate
4. Channel latency

52. Higher the Bandwidth,________ will be the data transmission rate or throughput

1. More
2. Less
3. Medium
4. None of these

53. In transmission of a signal, the range of carrier frequencies depends on the
1. Nature of medium
2. Requirement of the applications supported
3. Nature of distance
4. Both a & b
54. ________ may be defined as the range of frequencies being supported by a particular transmission medium

1. Frequency
2. Frequency spectrum
3. Carrier frequency
4. None of these

55. The actual range of frequencies supporting a given communication  is known as

1. Baud rate
2. Pass band
3. Band data
4. Pass

56. Higher frequency signal offers _________ bandwidth

1. Lesser
2. Greater
3. Medium
4. None of these

57. ________ refers to the minimum or maximum spatial separation between devices over  a link, in the context of a complete, end to end circuit

1. Bandwidth
2. Channel
3. Distance
4. None of these

58. _________ is the rate over network speed which is used to detect errors while transmitting data

1. Bit rate
2. Data rate
3. Baud rate
4. Pass band

59.  What is the frequency range of gamma and cosmic rays

1. >1008GHz
2. <1018GHz
3. >1018GHz
4. <1008GHz

60. The most popular method for detecting errors in bit rate is ________ a parity bit alongside the data bit for a character

1. Deleting
2. Inserting
3. Modifying
4. Updating

61. TDM means
1. Total division multiplex
2. Time division modem
3. Time detect modem
4. Time division multiplex
62. FEC means
1. Formal Error Checking
2. Forward Error Checking
3. Forward Error Character
4. Formal Error Character
63. The net bit rate is also known as
1. Pass bit rate
2. Data bit rate
3. Useful bit rate
4. Network bit rate
64. The incorrect bit rate is also known as
1. Data bit rate
2. Useful bit rate
3. Network bit rate
4. Parity bit
65. The example of net bit rate are

1. TDM
2. FEC
3. Framing Bit
4. All of these

66. The speed of connection of bit rate is determined by

1. TDM
2. FEC
3. Framing Bit
4. All of these

67. The FEC is also refers to
1. Logical layer net bit rate
2. Physical layer net bit rate
3. Prefix layer net bit rate
4. None of these
68. The size of the multimedia file is the product of _______
1. Bit rate in bytes
2. Bit rate in kilobytes
3. Bit rate in gigabytes
4. None of these
69. The size of the multimedia file is the length of recording in seconds divided by:

1. 4
2. 8
3. 12
4. 16

5.  
69. The fundamentals of Bit rate:
1. The sample uses different number of bits
2. The data is encoded by different number of bits
3. The material is sampled at different frequencies
4. The information is digitally compressed by different algorithms
5. All of these
70. The bit rate is __________ for a specific network

1. Fixed
2. Uniform
3. Fixed and Uniform
4. None of these

72. The gross bit rate is the number of bits transmitted
1. per second by an ideal transmitter
2. per second by an ideal transistor
3. per min by an ideal transmitter
4. per min by an ideal transistor
73. The bit rate could be as high as

1. 1Gbit/s
2. 1Mbit/s
3. 1Mbyte/s
4. 1Gbyte/s

74. Bit rate is used to calculate the speed of time to access the network
1. Without getting error frames
2. Getting error frames
3. Without getting error format
4. Getting error format
75. Bit rate is always ________ to the baud rate

1. Equal
2. More
3. Equal or more
4. None of these

76. Baud rate determines the bandwidth required to transmit the ______

1. Signal
2. Data
3. Symbol
4. None of these

77. Lesser bandwidth is required to move these signal units with _____ bits for an efficient system

1. Less
2. Large
3. Equal
4. None of these

78. A character set was designed by
1. Jean-Maurice-Emile Baudot in 1874
2. Jean-Maurice-Emile Baudot in 1885
3. John-Maurice-Emile Baudot in 1864
4. John-Merry-Emile Baudot in 1894
79. Character set system was implemented using keyboard having ____

1. 8-key
2. 6-key
3. 5-key
4. 9-key

80. Who modified system using keyboard using 5-key
1. Donald Murray in 1901
2. Donald Merry in 1902
3. Donald Duck in 1904
4. Donald Murray in 1902
81. Donald Murray modification took a shape as
1. International Telegraph Alphabet 1
2. International Telephone Alphabet 1
3. International Television Alphabet 1
4. International Telegram Alphabet 1
82. International Telegraph Alphabet 1 was further developed to

1. ITA 1
2. ITA 2
3. ITA 3
4. ITA 4

83. In character code system, a 5-bit code is

1. 00011
2. 00101
3. 00010
4. 10101

84. A 5-bit code is signified a

1. Line Feed
2. Light Feed
3. Line Format
4. None of these

85. The basic idea behind coding was really workable if number of characters it had to handle do not require more than

1. 8 characters
2. 16 characters
3. 32 characters
4. 64 characters

86. For covering all the characters of alphabet with special
1. Characters
2. Punctuation marks
3. Other control characters
4. Other coding technique was needed
5. All of these
87. Encoding is done for data

1. Inside computer
2. Outside computer
3. Both  a & b
4. None of these

88. The following data techniques are used
1. Binary Coded Decimal(BCD)
2. Extended Binary Coded Decimal Interchange Code(EBCDIC)
3. American Standard Code for Information Interchange(ASCII)
4. Unicode
5. Manchester Code
6. Differential Manchester Encoding(DME)
7. Return to Zero(RZ)
8. Non Return to Zero(NRZ)
9. Non Return to Zero Invertive(NRZ-I)
10. MLT-3
11. 4B/5B
12. 5B/6B
13. All of these
89. Unicode Examples are

1. UTF-7
2. UTF-8
3. UTF-16
4. UTF-32
5. UTF-EBCDIC
6. All of these

90. Binary Coded Decimal system makes use of a series of _____ to represent a decimal number

1. 4
2. 8
3. 16
4. 32

5.  
90. Nibble is known as series of ____

1. 8 bits
2. 4 bits
3. 16 bits
4. 32 bits

92. Extended Binary Coded Decimal Interchange Code is developed by
1. Parallel to ASCII, IBM in 1964
2. Parallel to ASCII, IBM in 1974
3. Parallel to ASCII, IBM in 1962
4. Parallel to ASCII, IBM in 1964
93. EBCDIC is a coding system that uses

1. 8 bit
2. 4 bit
3. 16 bit
4. 32 bit

94. A byte in EBCDIC system of coding contained ___ nibbles

1. 3
2. 4
3. 2
4. 6

95. First nibble is known as

1. Zone
2. Digit
3. Byte
4. Bit

96. Second nibble is known as

1. Zone
2. Digit
3. Byte
4. Bit

97. First nibble represents category to which the __________

1. Characters belong
2. Integers belong
3. String belong
4. None of these

98. ASCII is a ___ bit coding for representing characters of English alphabets

1. 64 bit
2. 7 bit
3. 16 bit
4. 32 bit

5.  
98. ASCII was published in

1. 1964
2. 1965
3. 1963
4. 1966

100. Unicode was developed by

a.       Unicode Consortium

b.      Unique Consortium

c.       Unicode Constant

d.      None of these

101. Unicode is appeared in

a.       1992

b.      1991

c.       1993

d.      1994

102. The first version of Unicode

1. Unicode 1.0
2. Unicode 2.0
3. Unicode 3.0
4. None of these

103. Unicode version 5.0 appeared in

1. 2005
2. 2006
3. 2007
4. 2004

104. In Unicode there were codes for representing characters and their basic graphical representation are known as

1. Graphical
2. Graphemes
3. Graphs
4. None of these

105. The first 256 code points belong to __________ for conversion to Roman Text

1. ISO 5589-1
2. ISO 5569-1
3. ISO 5579-1
4. ISO 5559-1

106. Unicode mapping methods are of two types, namely are
1. UTF(Unicode Transformation Format)
2. UCS(Unicode Character Set)
3. Both a & b
4. None of these  
107. Every communication channel has a ________ which is defined as the frequency range

1. Channel
2. Bandwidth
3. Carrier
4. Data rate

108. The bandwidth is a _________ property of a transmission medium

1. Physical
2. Logical
3. Both a & b
4. None of these

109. A telephone wire has bandwidth of ______ for short distance

1. 1M
2. 2M
3. 3M
4. 4M

110. Data rate that can be achieved using a channel depends on the _____________ of a channel

1. Frequency
2. Bandwidth
3. Data rate
4. Capacity

111. The undesirable waveform is known as

1. Anti-Aliasing
2. Aliasing
3. Channel
4. Bandwidth

112. The word PCM stands for
1. Primary code mapping
2. Pulse code modulation
3. Primary channel modulation
4. None of these
113. How many way to communicate, display, store or manipulate information

1. 1
2. 2
3. 3
4. 4

114. The way to communicate, display, store or manipulate information are

1. Analog
2. Digital
3. Both a & b
4. None of these

115. The analog form of electronic communication represents the information in
1. Continuous electromagnetic wave form
2. Discrete form
3. Both a & b
4. None of these
116. The digital form of electronic communication represents the information in
1. Continuous electromagnetic wave form
2. Discrete form
3. Both a & b
4. None of these
117. The word AM stands for
1. Analog Modulation
2. Analog Manipulation
3. Amplitude Modulation
4.  Analog Modeling
118. The word FM stands for
1. Frequency Modulation
2. Fourier Manipulation
3. Frequency Manipulation
4. Frequency Modeling
119. The bandwidth of voice grade channel is approximately

1. 4000Hz
2. 5000Hz
3. 6000Hz
4. 3000Hz

120. The bandwidth of CATV video channel  is approximately

1. 2MHz
2. 4MHz
3. 6MHz
4. 8MHz

121. The advantages of FM over AM are
1. Improved signal to noise ratio(about 25dB)
2. Less radiated power
3. Well defined service areas for given transmitter power
4. Smaller geographical interference between neighboring stations
5. All of these
122.  The disadvantages of FM are
1. Much more bandwidth(as much as 20 times as much)
2. More Complicated receiver
3. More complicated transmitter
4. All of these
123. Computer are________ in nature

1. Analog
2. Digital
3. Both a & b
4. None of these

124. SS7 means
1. Signal Source7
2. Signaling source7
3. Signaling system7
4. Signal system7
125. SS7 is a

1. System
2. Source
3. Protocol
4. None of these

126. The PSTN provides a _________ path between the destination and source

1. Logical
2. Physical
3. Both a & b
4. None of these

127. The functions of SS7 are
1. Controlling network
2. Set up and tear down the call
3. Handles the routines decision
4. All of these
128. SS7 uses voice switches known as
1. SSWs(Service Switching websites)
2. SSPs(Service Switching Points)
3. SSNs(Service Switching Networks)
4. SSDs(Service Switching Data)
129. SSPs uses Query Service Control Point (SCP) database using Packet switches called
1. Signal Transfer Points(STPs)
2. SSWs(Service Switching websites)
3. SSPs(Service Switching Points)
4. SSNs(Service Switching Networks)
130. _____________ refers to correct detection by receiving equipment at the beginning  and end of data that was sent from sending equipment

1. Asynchronous
2. Synchronous
3. Synchronization
4. None of these

131. Synchronous systems can be classified into three categories:
1. Asynchronous systems
2. Character synchronous systems
3. Flag Synchronous systems
4. All of these
132. Asynchronous transmission is a _________ method of transmission in which a sign bit is added to the beginning:

1. Start
2. Stop
3. Start-stop
4. None of these

133. Manchester is also known as
1. MPE(Manchester Phase Encoding)
2. MPD(Manchester Phase Data)
3. MPN(Manchester Phase Network)
4. MPW(Manchester Phase Website)
134. Manchester coding is used in telecommunication by
1. Encoding standard 802.3
2. Ethernet standard 802.3
3. Ethernet standard 805.3
4. Encoding standard 805.3

135.  For 10Mbps Ethernet carrier frequency is

1. 20MHz
2. 15MHz
3. 10MHz
4. 5MHz

5.  
135. The another name of DME(Differential Manchester Encoding)
1. CDP(Conditioned Diphase Encoding)
2. MPE(Manchester Phase Encoding)
3. SSWs(Service Switching websites)
4. SSPs(Service Switching Points)
136. In DME, logical values are indicated by _______________ of transitions

1. Absence
2. Presence
3. Both a & b
4. None of these

138. In RZ, zero between each bit signifies a _____________

1. Rest Condition
2. Neutral Point
3. Both a & b
4. None of these

139. The NRZ-pulses contain ____ energy in comparison to that of a RZ code

1. less
2. more
3. either less or more
4. none of these

140. NRZ has no ___ state

1. Rest
2. Zero
3. Neutral
4. None of these

141. MLT-3 is an encoding scheme in which ____ voltage levels are used

1. 2
2. 3
3. 4
4. 5

142. Due to four transitions the maximum fundamental frequency requirement is reduced to ____
1. One-fourth of the baud rate
2. One-third of the baud rate
3. One-half of the baud rate
4. None of these
143. Who specified the committee scheme of coding
1. ANSI X3T9.7
2. ANSI X5T9.6
3. ANSI X3T9.5
4. ANSI X6T9.5
144. FDDI uses ANSI X3T9.5  for obtaining 100Mbps from a signal of ______

1. 32.25MHz
2. 31.25MHz
3. 31.24MHz
4. 32.26MHz

145. 4B/5B encoding scheme is also known as

1. Block coding
2. Bit coding
3. Byte coding
4. Block character

146. In 4B/5B scheme, we need a 125MHz clock for a signal of

1. 1000MHz
2. 100MHz
3. 10MHz
4. 99MHz

147. The 5B/6B scheme encodes the scrambled 5-bit data pattern into predetermined _____ bit symbol

1. 5
2. 4
3. 6
4. 3

148. Modulation is the technique used to translate 
1. Information from source to destination
2. Low frequency to higher frequency                                     
3. Source to higher frequency
4. Low frequency to destination
149. The low frequency signal are

1. Audio
2. Video
3. Music
4. Data
5. All of these

150. The modulation/demodulation is a

1. Linear process
2. Non-linear process
3. Both a & b
4. None of these

151. In character synchronous system ,_______ are added

1. Special character
2. Start bit
3. Stop bit
4. None of these

152. Special character are called

1. STN
2. SYN
3. SBN
4. SRN

153. The character string of the SYN character is

1. 01001111
2. 10001110
3. 00010110
4. 00110011

154. The character synchronous system receives _______ as one character

1. 2bit
2. 4bit
3. 8bit
4. 16bit

155. In the 4B/5B we need a 125MHz clock for a signal of

1. 100MHz
2. 10MHz
3. 1000MHz
4. 10000MHz

156. 5B/6B creates a data pattern that is placed with equal numbers of

1. 1
2. 0
3. Both a & b
4. None of these

157. How many encoding techniques we used today

1. 10
2. 100
3. 1000
4. 10000

158. Modulation is the technique used to translate low-frequency(base-band) signals like __________ to a higher frequency

1. Audio
2. Music
3. Video
4. Data
5. All of these

159. Modulation/ demodulation is a non linear process where two different sinusoids are _________

1. Addition
2. Subtraction
3. Multiplied
4. Division

160. Angular frequency id defined as _______ the frequency of carrier signal

1. Once
2. Twice
3. Thrice
4. None of these

161. The frequencies that comprise the message (base band) are translated into a _________ range of frequencies

1. Lower
2. Higher
3. Zero
4. None of these

162. Modulation also reduces the size of antenna for higher frequencies with ________ frequency

1. Lower
2. Greater
3. Middle
4. None of these

163. The non-linearity results in several ___________ harmonics

1. Even
2. Odd
3. Both a & b
4. None of these

164. Harmonics are the _________ of the frequency, that is the message frequency

1. Addition
2. Subtraction
3. Multiply
4. Division

165. The carrier frequency may be a ___________

1. Radio wave
2. Light wave
3. Both a & b
4. None of these

166. The amplitude of  carrier frequency ________  in accordance with the modulated signal

1. Can not change
2. Change
3. Either change or not
4. None of these

167.  The frequency of the carrier ___________and we get a complex wave
1. does not changed
2. Change
3. Either change or not
4. None of these
168. For demodulation, it needs the carrier frequency to be generated or derived at the receiving location known as

1. DSB-SC
2. DBS-CS
3. BDS-SC
4. BSD-CS

169. The full form of DSB-SC
1. Direct Side Band-Suppressed Carrier
2. Direct Side Base-Suppressed Carrier
3. Double Side Band-Suppressed Carrier
4. Double Slide Band-Suppressed Carrier
170. One more kind of analog modulation is called
1. Vestigial side band modulation
2. Vestigial side base modulation
3. Vestigial slide band modulation
4. Vestigial slide base modulation
171. Pulse code modulation is a method by which an audio signals are represented as

1. Direct data
2. Digital data
3. Device data
4. None of these

172. Pulse Code Modulation(PCM) requires bandwidth of ________

1. 32Kbps
2. 64Kbps
3. 128Kbps
4. 256Kbps

173. PCM is a coding scheme used in digital communication because of _____ sensitive to noise

1. Less
2. Middle
3. High
4. None of these

174. In digital signal the main source of noise is ___________, which introduces as the finite number of quantization levels during the conversion to  PCM code
1. Quantization noise
2. Equalization noise
3. Digital noise
4. None of these
175. The main parameters in determining the quality of a PCM system are the
1. Dynamic range
2. Signal-to-Noise Ratio(SNR)
3. Both a & b
4. None of these
176. The maximum error occurs between the

1. Original level
2. Quantized level
3. Both a & b
4. None of these

177. The maximum error occurs when the original level falls exactly halfway between ______ quantized levels

1. 2
2. 3
3. 4
4. 1

178. The dynamic range is the ratio of the
1. Largest possible signal magnitude
2. Smallest possible signal magnitude
3. Both a & b
4. None of these
179. For a six bits system the dynamic range will be approximately equal to ___       

1. 34dB
2. 36dB
3. 40dB
4. 38dB

180. In dynamic range, the largest voltage amplitude is _______ the smallest voltage amplitude

1. 32times
2. 64times
3. 125times
4. 256times

181. The disadvantages associated with the Delta Modulation PCM is
1. Slope overload
2. Granular noise
3. Both a & b
4. None of these
182. Communication channels like ____________ are usually analog media
1. Telephone lines
2. Television lines
3. Digital lines
4. None of these
183. Which is a bandwidth-limited channel

1. Digital media
2. Analog media
3. Both a & b
4. None of these

184. In the case of telephone lines, the usable bandwidth falls in the range of _______
1. 300Hz to 3000Hz
2. 300Hz to 3300Hz
3. 30Hz to 3300Hz
4. 33Hz to 3300Hz
185. Digital information signals have the shape of pulse and represented by   

1. 0
2. 1
3. both a & b
4. none of these

186. The following types of modulation are used in modems
1. ASK-Amplitude Shift Keying
2. FSK-Frequency Shifted Keying
3. PSK-Phase Shift Keying
4. DPSK-Differential Phase Shift Keying
5. BPSK-Binary Phase Shift Keying
6. QPSK-Quadrature Phase Shifted Keying
7. QAM- Quadrature Amplitude Modulation
8. All of these
187. The main advantage of this technique, it is easy to such

1. Signals
2. Also to detect them
3. Both a & b
4. None of these

188. Telephone lines limit amplitude changes to some _________ changes per second

1. 3000
2. 3300
3. 3100
4. 3330

189. In the Frequency Shift keying, the frequency of the carrier signal is changed according to the data

1. Modulation
2. Data
3. Signals
4. None of these

190. In the Phase Shift Keying method a sine wave is transmitted and the phase of the sine wave carries the ______

1. Analog data
2. Digital data
3. Signal data
4. None of these

191. For a 0, a __ degrees phase sine wave is transmitted

1. 0
2. 45
3. 90
4. 180

192. For a 1, a __ degrees phase sine wave is transmitted

1. 0
2. 45
3. 90
4. 180

193. A sub method of the phase modulation is
1. Differential phase modulation
2. Direct phase modulation
3. Double phase modulation
4. None of these
194. Differential phase modulation technique is also called
1. Amplitude Shift Keying
2. Phase Shift Keying
3. Frequency Shift Keying
4. None of these
195. In the differential phase shift keying, For a 0 the modem shifts the phase of each succeeding signal in a certain number of degrees

1. 0
2. 45
3. 90
4. 180

196. In the differential phase shift keying, For a 1 the modem shifts the phase of each succeeding signal and a different  certain number of degrees

1. 0
2. 90
3. 180
4. 270

197. In binary phase shift keying, the case of 4 different phase shifts, where each symbol represents ____, the modulation technique is called quadrature PSK(QPSK)

1. 2 bits
2. 4 bits
3. 8 bits
4. 16 bits

198. In binary phase shift keying, the case of 8 different phase shifts, where each symbol represents ____, the modulation technique is called

1. QPSK
2. 8PSK
3. 8QAM
4. 8FSK

199. Binary Phase Shift Keying is measured in

1. Decibel
2. Baud
3. Hertz
4. bits per second

200. In QPSK, the four angle are usually out of phase by

1. 0
2. 45
3. 90
4. 180

201.  The AM is considered as a

1. Linear process
2. Non-linear process
3. Both a & b
4. None of these

202. The FM is considered as a

1. Linear process
2. Non-linear process
3. Both a & b
4. None of these

203. The phase modulation is similar to the

1. Amplitude Modulation
2. Frequency Modulation
3. Angle Modulation
4. Pulse Code Modulation

204. In PM, ________ of the carrier wave changes

1. Frequency
2. Phase
3. Both a & b
4. None of these

5.  
204. PCM requires bandwidth of

1. 21Kbps
2. 24Kbps
3. 64Kbps
4. 65Kbps

206. In data communication using computers ,________ signal are normally converted into PCM

1. Analog
2. Digital
3. Both a & b
4. None of these

207. The PCM is a coding scheme used in __________ communication because of less sensitive to noise

1. Analog
2. Digital
3. Both a &b
4. None of these

208. ________ is a process where multiple analog message signals or digital data streams are combined into one medium over a shared medium

1. Multiplexing
2. Modulation
3. Encoding technique
4. De-multiplexing

209.  The various ways to multiplex are
1. Frequency Division Multiplexing(FDM)
2.  Time  Division Multiplexing(TDM)
3. Code Division Multiplexing(CDM)
4. Wavelength Division Multiplexing(WDM)
5. All of these
210. In which , Multiple channels are combined onto a single aggregate signal for transmission
1. Frequency Division Multiplexing(FDM)
2. Time  Division Multiplexing(TDM)
3. Code Division Multiplexing(CDM)
4. Wavelength Division Multiplexing(WDM)
211. In FDM , channels are separated in the aggregate by their

1. Bandwidth
2. Signal
3. Frequency
4. None of these

212. _________ was the foremost multiplexing scheme to have the benefits of wide scale network deployment and till today, such systems are still in use and are used with analog transmission
1. Frequency Division Multiplexing(FDM)
2.  Time  Division Multiplexing(TDM)
3. Code Division Multiplexing(CDM)
4. Wavelength Division Multiplexing(WDM)
213. The two alternative technologies of multiplexing for digital sources are
1. Frequency Division Multiplexing(FDM)
2.  Time  Division Multiplexing(TDM)
3. Code Division Multiplexing(CDM)
4. Wavelength Division Multiplexing(WDM)
5. Both b & c
6. Both a & b
7. Both c & d
214. _______ provides a means for merging data from the varied sources into a single channel to support communication over a microwave system , satellite system or a telephone lines
1. Frequency Division Multiplexing(FDM)
2.  Time  Division Multiplexing(TDM)
3. Code Division Multiplexing(CDM)
4. Wavelength Division Multiplexing(WDM)
215. The TDM are implemented in two ways are

1. Synchronous TDM
2. Asynchronous TDM
3. Both a & b
4. None of these

5.  
215. In which type of TDM , a single channel is divided into time slots and each transmitting device is assigned for least one of the time slots for its transmission

1. Synchronous TDM
2. Asynchronous TDM
3. Both a & b
4. None of these

217. The Asynchronous TDM is properly known as

1. Statistical TDM
2. Static TDM
3. Dynamic TDM
4. None of these

218. Which ways of Multiplex are more flexible

1. FDM
2. TDM
3. CDM
4. None of these

219. In which way of multiplex ,the whole amount for a certain amount of time is provided to the user and all user uses the same frequency but at different time

1. FDM
2. TDM
3. CDM
4. None of these

220. To overcome the inefficiency of standard TDM, a technique known as

1. CDM
2. FDM
3. STDM
4. CDMA

221. The word UHF means

1. Ultra -High –Form
2. Ultra –Half-Form
3. Ultra- High-Frequency
4. Ultra-Half-Frequency

222. ________ may be defined as the form of multiplexing where the transmitter encodes the signal using a pseudo random sequence

1. CDM
2. FDM
3. STDM
4. CDMA

223. The number of different frequency per bit are called

1. Bit rate
2. Data rate
3. Baud rate
4. Chip rate

224. If one or more bits are transmitted at the same frequency are called

1. Frequency doping
2. Frequency hopping
3. Frequency hoping
4. Frequency hipping

225. The main disadvantage of CDM is
1. Protection from interference
2. Tapping as only the sender know the spreading code
3. Tapping as only the receiver know the spreading code
4. All of these
226. The Code Division Multiple Access(CDMA) was widely introduced in

1. 1963
2. 1989
3. 1979
4. 1958

227. In CDMA system ,all user transmit in the ______ bandwidth simultaneously

1. Different
2. Same
3. Both a & b
4. None of these

5.  
227. The spread spectrum technology of CDMA  is ___________ than TDMA

1. More secure
2. Provides higher transmission quality
3. Both a & b
4. None of these

5.  
228. A CDMA call starts with a standard rate of ___________ bits per second

1. 9500
2. 9200
3. 9300
4. 9600

230. The code used with the signal for spreading have
1. Low cross-correlation values
2. Unique to every user
3. Higher transmission quality
4. Both a & b
231. In spread spectrum technique, a receiver is only capable of selecting the desired signal if it has the knowledge about the code of the intended

1. Receiver
2. Transmitter
3. Both a & b
4. Signal

232. The major advantage of spread spectrum technique may be enumerated as
1. Low power spectral density
2. Interference limited operation
3. Privacy due to unknown random codes
4. Reduction of multi path affects
5. All of these
233.    The word FHSS stands for
1. frequency hopping spread spectrum
2. file hopping spread spectrum
3. file hiding spread spectrum
4. frequency hopping special spectrum
234.   The word DSSS stands for
1. digital sequence spread spectrum
2. direct sequence spread spectrum
3. digital sequence special spectrum
4. direct signal spread spectrum
235. The pattern of switching from one channel to another channel is known as

1. Hipping
2. Hyping
3. Harping
4. Hopping

236. ________ is best known spread spectrum technique in which a pseudo random noise code multiples the signal

1. FHSS
2. FCSS
3. DSSS
4. DHSS

237. A pseudo random noise code is a sequence of chips valued________ with noise-like properties

1. -1 and1(polar)
2. 0 and 1(non-polar)
3. Both a & b
4. None of these

5.  
237. ________ time is the time spent on a channel with certain frequency

1. FDM
2. Dwell
3. Dowel
4. Dowry

5.  
238. FHSS includes_______ technology

1. FDM
2. TDM
3. CDM
4. Both a & b

5.  
239.  Individual  channels are

1. Data
2. Audio
3. Video or their combination
4. All of these

241. __________ a multi-channel system in which a number of individuals channels are multiplexed for transmission

1. System
2. Carrier
3. Carrier system
4. None of these

242. T-carrier signaling scheme was developed by

1. Bell Laboratory
2. Hell Laboratory
3. Dull Laboratory
4. None of these

243.                      T1 standards is widely used in

1. Japan
2. North America
3. Both a & b
4. None of these

244. T-carrier was digital  signal 1, DS1 or DS-1 which is known as

1. T1
2. E1
3. DS0
4. DS1

245. DS-1 conveys the meaning of
1. Direct Service-Level 1
2. Digital Service-Level 1
3. Double Service-Level 1
4. Digital Slide-Level 1
246. E1 signifies another carrier system that finds use outside

1. North America
2. Japan
3. South Korea
4. All of these

247. A DS1 circuit  comprises ________ , each of 8 bits

1. 24 channels
2. 26 channels
3. 28 channels
4. 30 channels

248. 24 channels are also called

1. Timeslots
2. DS0
3. Both a & b
4. None of these

249. DS0 channel is a ______ that is multiplexed

1. 68Kbit/s
2. 64Kbit/s
3. 62Kbit/s
4. 70Kbit/s

250. DS1 is full-duplex circuit in which the circuit does concurrent transmission and reception at a data rate of ___

1. 1.533Mbit/s
2. 1.544Mbit/s
3. 1.566Mbit/s
4. 1.555Mbit/s

251. By sampling each 8-bit frame for 8000 times per second, total bandwidth achieved is ________

1. 1.537Kbit/s
2. 1.536Kbit/s
3. 1.538Kbit/s
4. 1.539Kbit/s

252. Framing schemes are of two types:
1. Super Frame(SF)
2. Extended Super Frame(ESF)
3. Both a & b
4. None of these
253. Framing channel has been divided into two each with ______ in Super Frame

1. 2Kbit/s
2. 3Kbit/s
3. 4Kbit/s
4. 6Kbit/s

254. There are _____ contiguous frames of 193-bit each in a Super Frame

1. 10
2. 12
3. 14
4. 16

255. There are _____ contiguous frames of 193-bit each in a Extended Super Frame

1. 20
2. 22
3. 24
4. 26

256. Framing channel has been divided into two each with _______ in Super frame

1. 2Kbit/s
2. 4Kbit/s
3. 6Kbit/s
4. 8Kbit/s

257. One is used for alignment of ________

1. Terminal frame
2. Signaling frame
3. Super frame
4. Switching frame

5.  
257. Second is used for alignment of ________

1. Terminal frame
2. Signaling frame
3. Super frame
4. Switching frame

5.  
258. Alignment of terminal is carried out with frames having _______ in the super frame

1. Even-number
2. Odd-number
3. Prime-number
4. None of these

260. A frame having _________ in the super frame is used for signaling alignment of frame

1. Even-number
2. Odd-number
3. Prime-number
4. None of these

261. T1 is recognized by its original ______ line rate

1. 1.566Mbit/s
2. 1.544Mbit/s
3. 1.555Mbit/s
4. 1.533Mbit/s

262. T1 used the encoding technique _______

1. AMI
2. LAN
3. DS1
4. CEPT

263. AMI means
1. Analog Memory Interchange
2. Alternate Memory Interchange
3. Alternate Mark Inversion
4. Analog Mark Interchange
264. AMI requires less

1. Bandwidth
2. Signal
3. Both a & b
4. None of these

265. CEPT means
1. Conference European of Postal Telecommunications
2. European Conference of Postal and Telecommunications
3. European Control of Postal Telecommunications
4. None of these
266. CEPT after ten years of launch of T1 system used _____ for framing known as European E1

1. 2bits
2. 4bits
3. 8bits
4. 16bits

267. An E1 carrier carries digital information at ______

1. 2.084Mbps
2. 2.048Mbps
3. 2.044Mbps
4. 2.088Mbps

268. An E1 circuit has been divided into ____ time slots

1. 30
2. 32
3. 34
4. 36

269. 32 time slots implements an individual communication channel supporting a bit rate of ________

1. 60Kbps
2. 62Kbps
3. 64Kbps
4. 66Kbps

270. An E1 frame has a total of _________

1. 128bits
2. 256bits
3. 64bits
4. 192bits

271. Which is used to exchange information over the E1 carriers that connect remote zones

1. Protocols Frame Relay
2. Cell Relay
3. Both a & b
4. None of these

5.  
271. CEPT revised and improved the technology adopted by

1. T-carrier system
2. E-carrier system
3. Both a & b
4. None of these

5.  
272. Which was taken by International Telecommunications Union Telecommunication Standardization Sector(ITU-T)

1. T-carrier system
2. E-carrier system
3. E1 system
4. T1 system

274. ITU-T finds wide use all over the world except three nations namely
1. UK, USA, Japan
2. USA, Canada, Japan
3. Japan, America, USA
4. Japan, America, Canada
275. PDH means
1. Plesiochronous Digital Hierarchy
2. Plasma Digital Hierarchy
3. Pointer Double Hard disk
4. Plasma Double Hierarchy
276.  In 32 timeslots of E1, only ___ are used two of these are used for framing and signalling call setup

1.  20
2. 15
3. 30
4. 40

277. High quality of call is ensured since transmission takes place with a constant

1. Latency
2. Capacity
3. Both a & b
4. None of these

278. Another timeslot is reserved for signalling purposes

1. TS16
2. TS15
3. TS14
4. TS13

279. Which is controlled some standard protocols in the field of telecommunications

1. Teardown
2. Call setup
3. Both a & b
4. None of these

280. E1 is different from earlier T-carrier systems since all ___ of every sampling are available for every call

1. 4bits
2. 8bits
3. 16bits
4. 32bits

281. There are two general categories of transmission media
1. Bounded(guided) media
2. Unbounded(unguided) media
3. Both a & b
4. None of these
282. __________ are bounded media

1. Twisted pair
2. Coaxial cable
3. Fibre optic cables
4. All of these

283. ________ are known as unbounded transmission
1. microwave and satellite transmission
2. both travel through the air
3. which has no boundaries
4. all of these
284. Wireless transmission systems do not make use of a

1. Physical conductor
2. Guide to bind the signal
3. Logical conductor
4. Both a & b

285. Energy travels through the air rather than

1. Copper
2. Glass
3. Both a & b
4. None of these

5.  
285. The transmission systems addressed under this category include

1. Microwave
2. Satellite
3. Infrared
4. All of the above

287. Which are used in radio transmission in one form or another

1. Radio
2. TV
3. Cellular phones
4. All of these

288. _______ is the one example of long distance communication

1. Satellite signal
2. Satellite relay
3. Analog signal
4. Digital signal

289. The RF(Radio Frequency) is divided in different ranges starting from
1. Very low frequency(VLF)
2. Extremely high frequency(EHF)
3. Both a & b
4. None of these
290. Two transmitters cannot share the same frequency  band because of     

1. Mutual interference
2. Band usage is regulated
3. Both a & b
4. None of these

291. PDAs means
1. Personal Digital Assistants
2. Personal Double Assistants
3. Personal Digital Analogs
4. Power Digital Assistants
292. ADSL means
1. Analogs Digital Subscriber Lines
2. Asymmetric Digital Subscriber Lines
3. Assistants Digital Subscriber Lines
4.  Asymmetric Digital Subscriber language
293. A pair of copper wires twisted together and wrapped with a plastic coating as a twisted pair and which has a diameter of ____:

1. 0.2-0.6
2. 0.4-0.7
3. 0.2-0.8
4. 0.4-0.8

294. ______ are the substances used for insulation purposes

1. Teflon(r)
2. Flouropolymer resin
3. Polyvinyl chloride
4. Polyethylene
5. All of these

6.  
294. In modem data rate is restricted to approximately____:

1. 24Kbps
2. 28Kbps
3. 30Kbps
4. 32Kbps

5.  
295. _______ was first used in telephone system by Alexander Graham Bell

1. Copper medium
2. Copper signal
3. Copper set up
4. None of these

5.  
296. The unshielded twisted pair states the link between the end in the communication closet and the outlet which is further restricted to

1. 60metres
2. 90metres
3. 100metres
4. 190metres

298. A UTP cable contains __________ twisted pairs

1. 2 to 240
2. 2 to 4200
3. 2 to 2400
4. None of these

299.  The major disadvantage of UTP is
1. Bandwidth is lower
2. Bandwidth is higher
3. Bandwidth is limited
4. Bandwidth is dynamic
300. STP stands for
1. Shielded twisted pair
2. Signal transmission pair
3. Shielding twisted process
4. Shielded transmission pair
301. 150Ohms STP contains ________IBM connector or RJ45

1. 1 pair
2. 2 pairs
3. 3 pairs
4. 4 pairs

302. 100Ohm UTP contains _________ and 8-pin modular connector(ISDN)

1. 2 pairs
2. 3 pairs
3. 4 pairs
4. 5 pairs

303. ________ contains multi-mode fibre

1. 52.5/125
2. 72.5/125
3. 62.5/125
4. 82.5/125

304. What are the biggest advantage of UTP
1. Flexibility
2. Cost-effective media
3. Usability of both data communication and voice
4. All of these
305. LED means
1. Light Emitting Device
2. Light Emitting Diode
3. Light Exchange Device
4. Light Exchange Diode
306. The effective capacity of coaxial cable depends on the
1. Spacing of amplifiers
2. The length of the circuit
3. The gauge of the centre conductor
4. Other intermediate devices
5. All of these
307. LANs function over coaxial cable to the __________ specifications

1. 10BASE5
2. 10BASE2
3. 10BASET
4. All of these

308. Coaxial cables are of two types

1. Baseband
2. Broadband
3. Both a & b
4. None of these

309. The  gauge of coaxial cable is _____  than the twisted pair

1. Thicker
2. Thinner
3. Heavy
4. Bulky

310. Traditional coaxial cable is quite ________ of which Ethernet LAN 10Base5 is an example

1. Thick
2. Heavy
3. Bulky
4. All of these

311. Twin axial cables contains _____ such configurations within a single cable sheath

1. 2
2. 3
3. 4
4. 5

312. The mechanical protections cover the _________

1. Secondary buffer coating
2. Primary buffer coating
3. Both a & b
4. None of these

313. The bandwidth is typically ________ over a length of one kilometer of fibre expressed as ‘MHz-Km’

1. 10 to 20
2. 20 to 30
3. 30 to 40
4. 40 to 50

314. In which multimode fibre, light is refracted by an increasing amount as it moves away from the core
1. Single mode fibre
2. Step index multimode fibre
3. Graded index multimode fibre
4. All of these
315. The actual bandwidth of graded index multimode fibre depends on
1. How well a particular fibre’s index profile minimizes model dispersion
2. The wavelength of light launched into the fibre
3. Both a & b
4. None of these
316. The typical bandwidth of graded index multimode fibre range from
1. 100MHz-Km to over 1GHz-Km
2. 200 MHz-Km to over 1GHz-Km
3. 300 MHz-Km to over 1GHz-Km
4. 150 MHz-Km to over 1GHz-Km
317. Which multimode fibre has a thinner inner core
1. Single mode fibre/ Monomode fibre
2. Step index multimode fibre
3. Graded index multimode fibre
4. All of these
318. In which multimode fibre , different wavelength of light travel at a different speeds
1. Single mode fibre
2. Step index multimode fibre
3. Graded index multimode fibre
4. All of these
319. The single mode fibers have the
1. Very broadest bandwidth
2. Lowest cost
3. Lowest attenuation of any optical fibre
4. All of these
320. The advantage of single mode fibre are
1. Small size and light weight
2. Large bandwidth
3. Flexibility and high strength
4. Secure against signal leakage and interference
5. No short circuit problems
6. All of these
321. The fibre optic systems consists of a

1. Light sources
2. Cables
3. Light detectors
4. All of these

322. In a fiber optic system, ______ are opto-electric devices

1. Repeater
2. EMI
3. RMI
4. RFI

323. EMI/RFI means
1. Electro Magnetic Interference / Radio Frequency Interference
2. Electronics Magnetic Interference/Redundancy Frequency Interference
3. Electro Minute Intrinsically/ Radio Fibre Interference
4. None of these
324. Monomode fibre optic systems routinely are capable of transmitting signal over distances in excess of

1. 250Km
2. 350Km
3. 225Km
4. 325Km

325. CAD means
1. Computer aided distribution
2. Computer application design
3. Computer aided design
4. None of these
326. Bounded Media Comparison Chart

Media	Advantages	Disadvantage
Twisted pair cable	Inexpensive, well established , easy to add nodes	Sensitive to noise, short distances, limited bandwidth, security hazard because of easy interception
Coaxial cable (in comparison to twisted)	High bandwidth, long distances	Physical dimensions, noise immunity security is better in pair cable
Optical fibre cable	Very High bandwidth, long distances, noise immunity, high security, small size	Connections, cost

327. In data communication the signal has to travel through the transmission media that may be

1. Wired
2. Wireless
3. Both a & b
4. None of these

328. There exist three causes of impairment in transmission errors

1. Attenuation
2. Distortion
3. Noise
4. All of these

329. ___________  is the loss of the signal power while traversing a transmission media including electronic circuitry

1. Attenuation
2. Distortion
3. Noise
4. None of these

330. Attenuation is measured in terms of

1. Hertz
2. Micro
3. decibel
4. Kilometer

331. Distortion is calculated as the ratio of the
1. Signal at two different points
2. Relative power of two signals at the same point
3. Both a & b
4. None of these
332. A negative value of decibel indicates _______ of signal strength

1. Loss
2. Gain
3. Either loss or gain
4. None of these

333. A positive value of decibel indicates _______ of signal strength

1. Loss
2. Gain
3. Either loss or gain
4. None of these

5.  
333. The attenuation includes a number of factors like           
1. Transmitting and receiving antennas
2. Transmitter powers
3. Modulation techniques
4. Frequency of the transmission
5. Atmospheric conditions
6. All of these
334. Distortion is proportional to the square of the _________
1. Atmospheric conditions
2. Modulation techniques
3. Operating frequency
4. Operating system
335. Equalizing devices are ________ at intermediate points to keep the shape of the signal intact

1. Created
2. Inserted
3. Modified
4. Deleted

337. Data processing and transmission systems experience errors due to several reasons
1. Electrostatic interference can be caused from circuits or machines lying close by
2. Inductance and capacitance, loss in transmission due to leakages, impulses from static in the atmosphere, etc, lead to distortion
3. Resistance to current in a cable can be caused due to attenuation
4. All of these
338. The main constraints are due to the physical medium that produces

1. Noise
2. Distortion
3. Attenuation
4. Dropouts
5. All of these

339. The digital signals do not suffer from ___________ but they are susceptible to dropouts

1. Noise
2. Distortion
3. Both a & b
4. None of these

340. The use of several parity bits  are
1. Help to detect any error
2. Find if any bits are inverted
3. They should be re-inverted so that the original data is restored
4. All of these
341. SECDEC means
1. Single error correction, double error detection
2. Single exchange correction, double exchange detection
3. Single error code, double error detection
4. Single error character, double error detection
342. The types of errors are

1. Single Bit Errors
2. Burst Errors
3. Both a & b
4. None of these

5.  
342. A transmission cable has

1. Inductance
2. Capacitance
3. Resistance
4. All of these

344. The inductance and capacitance tends to
1. Causes the amplitude of the signal to reduce
2. Distort the shape of a signal
3. Both a & b
4. None of these
345. The resistance tends to
1. Causes the amplitude of the signal to reduce and therefore loss of power
2. Distort the shape of a signal
3. Both a & b
4. None of these
346. Which type of error corrupt the single bits of transmission

1. Burst errors
2. Single bit errors
3. Both a & b
4. None of these

5.  
346.  Which type of error corrupt the multiple bits of transmission

1. Burst errors
2. Single bit errors
3. Both a & b
4. None of these

348. ENQ means

1. Enquiry
2. Encryptions
3. Enquire
4. None of these

349. BER stands for

1. Byte Enquiry Rate
2. Bit Error Rate
3. Burst Enquiry resistance
4. Burst Error Rate

350. NAK means
1. None Acknowledge
2. Noise Acknowledge
3. Negative Acknowledgement
4. Network Acknowledgement
351. The No of bits that get affected in burst errors depends upon the
1. Duration of the noise
2. Transmission time of the no of bits of the transmitted packet
3. Both a & b
4. None of these
352.  The redundant bit enables

1. correction of errors
2. detection of errors
3. Redundancy check
4. All of these

353. The types of redundancy processes are

1. Parity check
2. Cyclic redundancy check
3. Checksum
4. All of these

5.  
353. __________ is the technique of providing a data string that is added to information packets used to detect errors in data packets

1. CRC
2. Parity check
3. Checksum
4. All of these

5.  
354. Which redundancy process can detect the more than 95 per cent of all errors

1. CRC
2. Parity check
3. Checksum
4. All of these

356. CRC means
1. Circuit Redundancy Check
2. Cyclic Redundancy Check
3. Checksum Rail Check
4. None of these
357. The Two-dimensional parity check method can not

1. Correct the errors
2. Detect the errors
3. Correct and detect the errors
4. None of these

358. When signal amplitude degrades along a transmission medium , this is called

1. Signal attenuation
2. Signal bandwidth
3. Frequency
4. Data rate

359. The CRC is validated by using _______ conditions

1. 1
2. 2
3. 3
4. 4

360. The two conditions of CRC are
1. It should possess exactly one bit less than the divisor
2. When CRC is appended to the end of the data stream
3. Both a & b
4. None of these