Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Multiple Choice Questions
Q1381: In FHSS, how are the frequencies selected for transmission?
- A: Randomly from all frequencies
- B: Based on modulation amplitude
- C: In a sequence determined by a hopping pattern
- D: By user input
View Answer
C
Q1382: The process of changing carrier frequencies in FHSS is called ______.
- A: Frequency division
- B: Carrier modulation
- C: Frequency hopping
- D: Bit chipping
View Answer
C
Q1383: How many different carrier frequencies are used in FHSS?
- A: One
- B: Two
- C: Fixed number ‘M’
- D: Unlimited
View Answer
C
Q1384: FHSS helps avoid interference and interception by ______.
- A: transmitting at very low power
- B: using long wires for signal shifting
- C: randomly changing carrier frequency
- D: staying on one frequency
View Answer
C
Q1385: In DSSS, what replaces each data bit?
- A: Parity bit
- B: Encoded character
- C: ‘n’ bits from a spreading code
- D: Error checking code
View Answer
C
Q1386: What is the full form of DSSS?
- A: Direct Signal Spread Spectrum
- B: Digital Sequence Signal Spreading
- C: Direct Sequence Spread Spectrum
- D: Digital Signal Spectrum Spreading
View Answer
C
Q1387: In DSSS, the new bits that replace the data bit are called ______.
- A: chips
- B: codes
- C: pulses
- D: frames
View Answer
A
Q1388: What is the rate of chips compared to the original data rate in DSSS?
- A: Equal to data rate
- B: Lower than data rate
- C: Two times the data rate
- D: ‘n’ times the data rate
View Answer
D
Q1389: DSSS and FHSS both ______.
- A: use the same chip rate
- B: expand bandwidth of the original signal
- C: use amplitude modulation
- D: transmit at baseband frequency
View Answer
B
Q1390: Which spread spectrum method replaces each bit with a sequence of bits?
- A: FHSS
- B: TDMA
- C: DSSS
- D: FDM
View Answer
C