MCQ Quiz: Data Communication! Test
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Think you are an expert in digital communication? Can you pass this quiz? Data communication is the transmission of digital data between two or more computers and a computer network. It is a network that allows computers to exchange information. The physical connection between networked computing devices is established using either cable media or wireless media. Computer systems are connected to form a network. This quiz will explain all the variables of data communication.
- 1.Sampling is process to convert _________ to ____________
- A.
Analog signal to digital signal
- B.
Continous time signal to discrete time signal
- C.
Signal to message
- D.
None of the above
- 2.If even parity is being used then the value of parity bit should be ______ for data sequence 101010.
- A.
1
- B.
0
- C.
2
- D.
3
- 3.Asynchronous transmission is ________ efficient as compared to synchronous transmission.
- A.
More
- B.
Equally
- C.
Less
- D.
None
- 4.CRC code is ____________ technique.
- A.
Error detection
- B.
Error correction
- C.
Flow control
- D.
Encryption
- 5.Consider data word 1110 is to transmitted using CRC code and if the pattern P= 1101 then how many redundant bits will be added to data word to make code word?
- A.
Three
- B.
Four
- C.
Two
- D.
One
- 6.If the generator polynomial is X^4 + X^3 + 1 then the corresponding binary pattern will be:
- A.
11001
- B.
11010
- C.
10011
- D.
110
- 7.The signal-to-noise ratio (in dB) for n-bit PCM can be expressed as:
- A.
6.02n + 1.76
- B.
20log 2 + 1.76
- C.
1.76n + 6.02
- D.
20nlog 2 + 1.76
- 8.The ratio of data rate R, to transmission bandwidth is referred to as the:
- A.
Baud Rate
- B.
Bandwidth efficiency
- C.
Signal efficiency
- D.
Bit Rate Efficiency
- 9.In asynchronous transmission, assume that data rate 10 kbps & the receiver clock is fast by 6%, then the receiver samples the incoming character at every:
- A.
100 micro seconds
- B.
47 micro seconds
- C.
94 micro seconds
- D.
50 micro seconds
- 10.If R is the bit rate and r is related to the technique by which the signal is filtered to establish a bandwidth for transmission, then transmission bandwidth for ASK is equal to:
- A.
(1+ r)R
- B.
(1+ r)/R
- C.
(1+ R)r
- D.
(1+ R)/r
- 11.The ________ between two words is the number of differences between corresponding bits.
- A.
HAMMING RULE
- B.
HAMMING DISTANCE HAMMING DISTANCE
- C.
HAMMING CODE
- D.
NONE OF THE ABOVE
- 12.In block coding, we divide our message into blocks, is called
- A.
CODEWORDS
- B.
ERROR CODES
- C.
PACKET BLOCKS
- D.
DATAWORDS
- 13.Find parity bit for 1001011.
- A.
1
- B.
2
- C.
3
- D.
0
- 14.Which error detection method consists of just one redundant bit per data unit?
- A.
CRC
- B.
CheckSum
- C.
Simple Parity
- D.
Hamming Distance
- 15.In ________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remain constant.
- A.
PSK
- B.
ASK
- C.
FSK
- D.
QAM
- 16._______ conversion is the process of changing one of the characteristics of an analog signal based on the information in the digital data.
- A.
Analog-to-analog
- B.
Digital-to-digital
- C.
Digital-to-Analog
- D.
None of these
- 17.In ________, the phase of the carrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant.
- A.
PSK
- B.
ASK
- C.
FSK
- D.
QAM
- 18.ASK, PSK, FSK, and QAM are examples of ________ conversion.
- A.
Analog-to-analog
- B.
Digital-to-digital
- C.
Analog-to-digital
- D.
Digital-to-analog
- 19.If the value of checksum is 0, then the message is:
- A.
Accepted
- B.
Rejected
- C.
Sendback
- D.
None of these
- 20.If the generator of cyclic code has at least two terms and rightmost bit is 1 then error cannot be divided by:
- A.
Syndrome
- B.
Error
- C.
Dataword
- D.
Generator
- 21.In bit pattern, shifting to right means:
- A.
Adding extra 0s as rightmost bits
- B.
Deleting some rightmost bits
- C.
Adding extra 1s as rightmost bits
- D.
Deleting some leftmost bits
- 22.The _______ of a polynomial is the highest power in the polynomial.
- A.
Range
- B.
Power
- C.
Degree
- D.
None
- 23.In cyclic redundancy checking, the divisor is _______ the CRC.
- A.
The same size as
- B.
One bit less than one bit less than one bit less than one bit less than one bit less than
- C.
One bit more than
- D.
None
- 24.In cyclic redundancy checking, what is the CRC?
- A.
The divisor The Divisor
- B.
The Dividend
- C.
The Reminder
- D.
The Quotient
- 25.Which can detect two-bit errors?
- A.
Parity check
- B.
Parity & Cyclic redundancy check
- C.
Cyclic redundancy check
- D.
None of the mentioned
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