Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 22
Q501:
What device is used to implement a Quad 1-of-4 MUX according to the document?
A. GAL16V8
B. GAL20V8
C. GAL22V10
D. GAL10V8
Correct Answer:
B
Chapter: 22
Q502:
In the given implementation, which input pins are used for select lines in the Quad 1-of-4 MUX?
A. A0, A1
B. S0, S1
C. D0, D1
D. B0, B1
Correct Answer:
B
Chapter: 22
Q503:
What is the output of the Quad 1-of-4 MUX when S1 = 0, S0 = 1, A0 = 1, A1 = 0, A2 = 0, A3 = 0?
A. 1
B. zero
C. 1, 0, 0, 0
D. 0, 1, 0, 0
Correct Answer:
A
Chapter: 22
Q504:
What is the output of the Quad 1-of-4 MUX when S1 = 1, S0 = 0, B0 = 1, B1 = 0, B2 = 0, B3 = 0?
A. 1
B. zero
C. 1, 0, 0, 0
D. 0, 1, 0, 0
Correct Answer:
A
Chapter: 22
Q505:
Which logic gates are used in an S-R NAND latch?
A. NOR gates
B. NAND gates
C. AND gates
D. OR gates
Correct Answer:
B
Chapter: 22
Q506:
What happens when both inputs S and R are 0 in an S-R NAND latch?
A. Both outputs are set to 0
B. Both outputs are set to 1
C. One output is 1 and the other is 0
D. Both outputs are invalid
Correct Answer:
B
Chapter: 22
Q507:
What is the output when S=0 and R=1 for an S-R NAND latch?
A. Q = 1, Q = 0
B. Q = 0, Q = 1
C. Both outputs are invalid
D. Q = 1, Q = 1
Correct Answer:
A
Chapter: 22
Q508:
In an S-R NOR latch, what is the output when S=1 and R=0?
A. Q = 0, Q = 1
B. Q = 1, Q = 0
C. Both outputs are 1
D. Both outputs are 0
Correct Answer:
B
Chapter: 22
Q509:
What does the NOR gate based S-R latch do with inputs S=0 and R=1?
A. Sets Q to 1 and Q to 0
B. Sets Q to 0 and Q to 1
C. Maintains previous state
D. Invalid state
Correct Answer:
A
Chapter: 22
Q510:
What is a key difference between NAND and NOR based S-R latches?
A. NAND has active-high inputs, NOR has active-low inputs
B. NAND has active-low inputs, NOR has active-high inputs
C. NAND and NOR latches are identical
D. Both use the same input logic
Correct Answer:
B
Chapter: 23
Q511:
What is the purpose of an S-R latch in a digital system?
A. To amplify signals
B. To prevent switch bounce from affecting the digital circuit
C. To increase the voltage
D. To measure the frequency of a signal
Correct Answer:
B
Chapter: 23
Q512:
What happens to the output of a switch when it is moved up to connect the resistor to the ground?
A. It fluctuates between logic high and low briefly before settling
B. It immediately settles to logic high
C. It immediately settles to logic low
D. It remains unchanged
Correct Answer:
A
Chapter: 23
Q513:
In the context of an S-R latch, what does the latch do when the switch is bouncing between logic high and low?
A. It allows the signal to vary freely
B. It ignores the fluctuations and maintains a stable state
C. It amplifies the signal
D. It changes the frequency of the signal
Correct Answer:
B
Chapter: 23
Q514:
What does TTL stand for in digital electronics?
A. Transistor-Transistor Logic
B. Time-Triggered Logic
C. Transistor-Transmitter Logic
D. Time-Triggered Logic
Correct Answer:
A
Chapter: 23
Q515:
Which logic gate is known as a universal gate?
A. AND Gate
B. OR Gate
C. XOR Gate
D. NAND Gate
Correct Answer:
D
Chapter: 23
Q516:
What is the binary representation of the decimal number 10?
A. 0001 1010
B. 0000 1010
C. 0001 0010
D. 0010 0100
Correct Answer:
B
Chapter: 23
Q517:
What is the function of a multiplexer in digital circuits?
A. To amplify signals
B. To combine multiple signals into one signal
C. To separate one signal into multiple signals
D. To convert analog signals to digital signals
Correct Answer:
B
Chapter: 23
Q518:
Which component is used to store data in a digital circuit?
A. Transformer
B. Capacitor
C. Flip-Flop
D. Resistor
Correct Answer:
C
Chapter: 23
Q519:
The minimum time for which the input signal has to be maintained at the input of flip-flop is called ______ of the flip-flop.
A. Set-up time
B. Hold time
C. Pulse Interval time
D. Pulse Stability time (PST)
Correct Answer:
B
Chapter: 23
Q520:
In a flip-flop circuit, what is the primary role of the clock signal?
A. To amplify the signal
B. To synchronize changes in the state of the flip-flop
C. To provide power to the flip-flop
D. To measure the frequency of the signal
Correct Answer:
B