Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 29
Q601:
How many cells are there in a 3-variable Karnaugh Map?
A. 4
B. 8
C. 16
D. 32
Correct Answer:
C
Chapter: 29
Q602:
In an Up/Down Counter, what does the UP/DOWN input determine?
A. The number of bits
B. The direction of counting
C. The frequency of the clock
D. The reset function
Correct Answer:
B
Chapter: 29
Q603:
What is the primary function of the MAX/MIN output in the 74HC190 IC?
A. To indicate the terminal count
B. To enable the counter
C. To reset the counter
D. To provide clock pulses
Correct Answer:
A
Chapter: 29
Q604:
How does an Up/Down counter switch between counting up and down?
A. By changing the clock frequency
B. By altering the state of the UP/DOWN input
C. By resetting the counter
D. By adjusting the flip-flops
Correct Answer:
B
Chapter: 29
Q605:
What is the purpose of the Ripple Clock Output (RCO) in a counter IC?
A. To provide the maximum count value
B. To enable multiple counter ICs in cascade
C. To set the counter to zero
D. To indicate a terminal count
Correct Answer:
B
Chapter: 29
Q606:
In a 74HC190 IC, what does the D/U input control?
A. The counter speed
B. The direction of counting
C. The clock frequency
D. The load function
Correct Answer:
B
Chapter: 29
Q607:
How are glitches in counter outputs typically removed?
A. By using a higher clock frequency
B. By enabling the decoder during the clock's positive phase
C. By adjusting the input signals
D. By changing the counter IC
Correct Answer:
B
Chapter: 29
Q608:
The divide-by-60 counter in digital clock is implemented by using two cascading counters:
A. Mod-6, Mod-10
B. Mod-50, Mod-10
C. Mod-10, Mod-50
D. Mod-50, Mod-6
Correct Answer:
A
Chapter: 29
Q609:
What does the 'strobing method' refer to in decoding counter outputs?
A. Enabling the decoder outputs before the clock signal
B. Enabling the decoder outputs after glitches have settled
C. Using a higher clock frequency
D. Resetting the counter at intervals
Correct Answer:
B
Chapter: 29
Q610:
In a frequency counter, how is the frequency of an unknown signal calculated?
A. By measuring the voltage
B. By counting the number of pulses in a sampling interval
C. By adjusting the clock signal
D. By analyzing the signal waveform
Correct Answer:
B
Chapter: 29
Q611:
How does a digital clock use a divide-by-60 counter?
A. To count hours
B. To count seconds and minutes
C. To measure frequency
D. To reset the clock
Correct Answer:
B
Chapter: 29
Q612:
What is the main function of the AND gate in a divide-by-60 counter circuit?
A. To count up to 100
B. To divide the clock signal
C. To enable the counter for each digit
D. To reset the counter
Correct Answer:
C
Chapter: 29
Q613:
How are the state transitions of a sequential circuit determined?
A. By the current input signals only
B. By the current state and the input signals
C. By the clock frequency
D. By the flip-flop type
Correct Answer:
B
Chapter: 29
Q614:
What does a state diagram represent in sequential circuit design?
A. The physical layout of the circuit
B. The sequence of states through which the circuit progresses
C. The timing diagram of the circuit
D. The logic gates used in the circuit
Correct Answer:
B
Chapter: 29
Q615:
In a 3-bit Up-Counter, what is the next state when the current state is 010 and X=0?
A. 11
B. 100
C. 1
D. 101
Correct Answer:
A
Chapter: 29
Q616:
What is the role of Karnaugh Maps in the design of sequential circuits?
A. To simplify the Boolean expressions for flip-flop inputs
B. To determine the clock frequency
C. To design the physical layout of the circuit
D. To analyze the signal timing
Correct Answer:
A
Chapter: 29
Q617:
How is a 3-bit Up/Down counter implemented using flip-flops?
A. By connecting flip-flops in series without additional logic
B. By connecting flip-flops and using additional logic for counting direction
C. By using a single flip-flop with a counter IC
D. By adjusting the clock frequency
Correct Answer:
B
Chapter: 29
Q618:
What is the purpose of the load input (LOAD) in a 74HC190 counter IC?
A. To clear the counter
B. To set the counter to a specific value
C. To enable counting
D. To provide the clock signal
Correct Answer:
B
Chapter: 29
Q619:
How are flip-flop inputs determined in a sequential circuit design?
A. From the next-state table
B. From the Karnaugh Maps
C. From the current state only
D. From the clock frequency
Correct Answer:
A
Chapter: 29
Q620:
In a frequency counter, what effect does reducing the sampling interval have on accuracy?
A. It improves accuracy
B. It decreases accuracy
C. It has no effect on accuracy
D. It increases the count value
Correct Answer:
B