Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 81
Q1081:
What happens when the binary data element changes in FSK?
A. Amplitude changes
B. Frequency changes
C. Phase changes
D. Data rate doubles
Correct Answer:
B
Chapter: 81
Q1082:
Which of the following uses FSK for communication?
A. Wi-Fi
B. Low-speed modems
C. TV broadcasting
D. AM radio
Correct Answer:
B
Chapter: 81
Q1083:
What is the key characteristic of the carrier signal in Binary FSK?
A. Two distinct frequencies
B. Multiple phases
C. Variable amplitude
D. Constant bandwidth
Correct Answer:
A
Chapter: 81
Q1084:
Fill in the blank: FSK provides better _______ performance compared to ASK.
A. complexity
B. noise immunity
C. hardware cost
D. bandwidth usage
Correct Answer:
B
Chapter: 81
Q1085:
The carrier signal frequency for Binary FSK is _______ for binary 1 compared to binary 0.
A. the same
B. lower
C. higher
D. zero
Correct Answer:
C
Chapter: 82
Q1086:
In Frequency Shift Keying (FSK), which parameter is varied to represent data?
A. Amplitude
B. Frequency
C. Phase
D. Bit rate
Correct Answer:
B
Chapter: 82
Q1087:
What is the formula to calculate the carrier frequency in FSK when bandwidth is given?
A. B = 2 × (f1 + f2)
B. B = f1 − f2
C. B = 2 × Δf
D. B = 2 × (1 + d)
Correct Answer:
C
Chapter: 82
Q1088:
Fill in the blank: FSK uses _______ frequencies to represent binary 0 and 1.
A. two
B. three
C. one
D. multiple
Correct Answer:
A
Chapter: 82
Q1089:
What is the key advantage of FSK over ASK?
A. Better noise immunity
B. Lower bandwidth usage
C. Simple implementation
D. Faster modulation
Correct Answer:
A
Chapter: 82
Q1090:
If an available bandwidth is 100 kHz spanning from 200 kHz to 300 kHz, what is the carrier frequency for binary 0 and 1 in FSK with d = 1?
A. 200 kHz and 300 kHz
B. 150 kHz and 250 kHz
C. 220 kHz and 280 kHz
D. 250 kHz and 300 kHz
Correct Answer:
A
Chapter: 82
Q1091:
Fill in the blank: In FSK, the _______ of the carrier signal changes for each data element.
A. amplitude
B. phase
C. frequency
D. bit rate
Correct Answer:
C
Chapter: 82
Q1092:
What is the bandwidth requirement for FSK when d = 1 and Δf = 10 kHz?
A. 10 kHz
B. 40 kHz
C. 20 kHz
D. 60 kHz
Correct Answer:
C
Chapter: 82
Q1093:
Binary FSK is also referred to as _______.
A. On-Off Keying
B. Continuous Wave Modulation
C. Two-level FSK
D. Quadrature Modulation
Correct Answer:
C
Chapter: 82
Q1094:
In Binary FSK, if Δf = 20 kHz and bit rate = 10 kbps, what is the total bandwidth?
A. 10 kHz
B. 60 kHz
C. 40 kHz
D. 80 kHz
Correct Answer:
B
Chapter: 82
Q1095:
The frequency deviation (Δf) in FSK is defined as the _______.
A. Difference between two carrier frequencies
B. Average of two frequencies
C. Peak frequency divided by time
D. Frequency multiplied by bandwidth
Correct Answer:
A
Chapter: 82
Q1096:
Fill in the blank: FSK can be classified as _______ modulation.
A. Analog
B. Amplitude
C. Phase
D. Digital
Correct Answer:
D
Chapter: 82
Q1097:
If the bit rate is 5 kbps and Δf = 10 kHz, what is the minimum required bandwidth for Binary FSK?
A. 20 kHz
B. 30 kHz
C. 25 kHz
D. 40 kHz
Correct Answer:
B
Chapter: 82
Q1098:
Which of the following remains constant in FSK modulation?
A. Carrier amplitude
B. Carrier frequency
C. Bit rate
D. Data element
Correct Answer:
A
Chapter: 82
Q1099:
Fill in the blank: Binary FSK uses two distinct carrier frequencies to represent _______.
A. bit rate
B. amplitude modulation
C. phase shifts
D. binary data
Correct Answer:
D
Chapter: 82
Q1100:
What happens to the carrier frequency in FSK when the binary data changes?
A. It remains constant
B. It increases
C. It decreases
D. It alternates between two values
Correct Answer:
D