Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Multiple Choice Questions
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
View Answer
A
Q1112: How many phase shifts are used in Quadrature Phase Shift Keying (QPSK)?
- A: 2
- B: 4
- C: 8
- D: 16
View Answer
B
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
View Answer
B
Q1114: Which modulation scheme uses four distinct phase shifts to represent data?
- A: ASK
- B: FSK
- C: BPSK
- D: QPSK
View Answer
D
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
View Answer
C
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
View Answer
B
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°
View Answer
C
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
View Answer
C
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
View Answer
B
Q1120: Which of the following is an implementation of Binary Phase Shift Keying?
- A: OOK
- B: BPSK
- C: FSK
- D: ASK
View Answer
B