Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 82
Q1101:
If the available bandwidth is 80 kHz and bit rate is 15 kbps, what is the frequency deviation for Binary FSK?
A. 10 kHz
B. 20 kHz
C. 25 kHz
D. 15 kHz
Correct Answer:
A
Chapter: 82
Q1102:
Which type of noise is FSK most resistant to compared to ASK?
A. Phase noise
B. Amplitude noise
C. Frequency noise
D. Impulse noise
Correct Answer:
B
Chapter: 82
Q1103:
Fill in the blank: The _______ of the carrier wave alternates between two levels in Binary FSK.
A. frequency
B. amplitude
C. phase
D. bit rate
Correct Answer:
A
Chapter: 82
Q1104:
What is the minimum separation between two carrier frequencies in Binary FSK to avoid interference?
A. Equal to the bit rate
B. Double the bit rate
C. Equal to the frequency deviation
D. None of the above
Correct Answer:
A
Chapter: 83
Q1105:
In Phase Shift Keying (PSK), which parameter is varied to represent data?
A. Amplitude
B. Frequency
C. Phase
D. Bit rate
Correct Answer:
C
Chapter: 83
Q1106:
Which type of keying is more common than ASK or FSK?
A. Amplitude Shift Keying (ASK)
B. Frequency Shift Keying (FSK)
C. Phase Shift Keying (PSK)
D. On-Off Keying
Correct Answer:
C
Chapter: 83
Q1107:
Fill in the blank: Binary Phase Shift Keying (BPSK) uses _______ phase shifts to represent data.
A. two
B. four
C. eight
D. sixteen
Correct Answer:
A
Chapter: 83
Q1108:
What is the advantage of PSK over ASK?
A. Lower bandwidth usage
B. Better noise immunity
C. Higher data rate
D. Simple implementation
Correct Answer:
B
Chapter: 83
Q1109:
What is the phase difference between the two states in Binary Phase Shift Keying (BPSK)?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees
Correct Answer:
B
Chapter: 83
Q1110:
Fill in the blank: PSK is commonly used for _______ communication.
A. analog
B. digital
C. hybrid
D. audio
Correct Answer:
B
Chapter: 83
Q1111:
What is the bandwidth required for a signal transmitting at 12 Mbps using QPSK?
A. 6 MHz
B. 12 MHz
C. 18 MHz
D. 24 MHz
Correct Answer:
A
Chapter: 83
Q1112:
How many phase shifts are used in Quadrature Phase Shift Keying (QPSK)?
A. 2
B. 4
C. 8
D. 16
Correct Answer:
B
Chapter: 83
Q1113:
Fill in the blank: QPSK improves data transmission efficiency by transmitting _______ per symbol.
A. one bit
B. two bits
C. three bits
D. four bits
Correct Answer:
B
Chapter: 83
Q1114:
Which modulation scheme uses four distinct phase shifts to represent data?
A. ASK
B. FSK
C. BPSK
D. QPSK
Correct Answer:
D
Chapter: 83
Q1115:
What is the key benefit of QPSK over BPSK?
A. Better noise immunity
B. Higher bandwidth usage
C. Double the data rate
D. Simple implementation
Correct Answer:
C
Chapter: 83
Q1116:
If the bit rate of a signal is 20 Mbps and QPSK is used, what is the symbol rate?
A. 5 Mbps
B. 10 Mbps
C. 20 Mbps
D. 40 Mbps
Correct Answer:
B
Chapter: 83
Q1117:
What happens to the phase of the carrier signal in BPSK when the data changes?
A. It remains constant
B. It increases by 90°
C. It shifts by 180°
D. It decreases by 90°
Correct Answer:
C
Chapter: 83
Q1118:
Fill in the blank: In PSK, a higher number of phase shifts allows for _______ data rates.
A. lower
B. same
C. higher
D. reduced
Correct Answer:
C
Chapter: 83
Q1119:
What is the minimum bandwidth required for a signal transmitting at 8 Mbps using BPSK?
A. 4 MHz
B. 8 MHz
C. 12 MHz
D. 16 MHz
Correct Answer:
B
Chapter: 83
Q1120:
Which of the following is an implementation of Binary Phase Shift Keying?
A. OOK
B. BPSK
C. FSK
D. ASK
Correct Answer:
B