Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 33
Q681:
In the Karnaugh Map for D flip-flop inputs of the second state assignment, what is the expression for D1?
A. Q2 + Q0X + Q1Q0
B. Q2Q0 + Q1Q0 + Q1X
C. Q2Q1Q0X + Q1Q0X
D. Q1Q0X + Q2Q0X + Q1Q0
Correct Answer:
A
Chapter: 34
Q682:
What is the primary function of a shift register?
A. Store data
B. Perform arithmetic
C. Perform logical operations
D. Provide power
Correct Answer:
A
Chapter: 34
Q683:
How does a Serial In/Shift Right/Serial Out shift register work?
A. Data is shifted left
B. Data is shifted right
C. Data is shifted in parallel
D. Data is shifted out in parallel
Correct Answer:
B
Chapter: 34
Q684:
How many clock pulses are needed to shift a 4-bit data completely out of a Serial In/Shift Right/Serial Out register?
A. 4
B. 8
C. 16
D. 32
Correct Answer:
B
Chapter: 34
Q685:
In a Serial In/Shift Left/Serial Out operation, data enters from which side?
A. Left
B. Right
C. Center
D. Bottom
Correct Answer:
B
Chapter: 34
Q686:
What type of shift operation involves moving data left or right in a register?
A. Serial operation
B. Parallel operation
C. Bidirectional operation
D. Asynchronous operation
Correct Answer:
C
Chapter: 34
Q687:
How is a Bi-directional Shift Register controlled?
A. By setting clock signals
B. By setting RIGHT/LEFT signals
C. By enabling CLR input
D. By applying parallel inputs
Correct Answer:
B
Chapter: 34
Q688:
The key advantage of using CMOS technology is its low power consumption and ________
A. High speed
B. High noise margin
C. High reliability
D. High integration density
Correct Answer:
B
Chapter: 34
Q689:
What does the 74HC164 shift register do?
A. Serial In/Parallel Out
B. Parallel In/Serial Out
C. Serial In/Serial In
D. Parallel In/Parallel Out
Correct Answer:
A
Chapter: 34
Q690:
How is the 74HC164 shift register cleared?
A. By applying a high signal to CLR
B. By applying a low signal to CLR
C. By applying a clock pulse
D. By enabling the SHIFT input
Correct Answer:
B
Chapter: 34
Q691:
What operation is performed by the 74HC165 shift register?
A. Parallel In/Serial Out
B. Serial In/Parallel Out
C. Serial In/Serial Out
D. Parallel In/Parallel In
Correct Answer:
A
Chapter: 34
Q692:
In a Parallel In/Serial Out shift register, how is data entered into the register?
A. Serially
B. Parallelly
C. Asynchronously
D. Synchronously
Correct Answer:
B
Chapter: 34
Q693:
What is the main purpose of a Rotate Right operation in a shift register?
A. To shift data left
B. To shift data right
C. To clear the register
D. To load data parallelly
Correct Answer:
B
Chapter: 34
Q694:
How is the 74HC195 shift register controlled?
A. By setting shift/load signals
B. By adjusting clock frequency
C. By varying the data input
D. By applying a clear signal
Correct Answer:
A
Chapter: 34
Q695:
What is unique about the Johnson Counter?
A. It rotates data left
B. It rotates data right
C. It sequences through 2^n states
D. It sequences through 2n states
Correct Answer:
D
Chapter: 34
Q696:
How does a Ring Counter start its operation?
A. With all flip-flops set low
B. With all flip-flops set high
C. With only the first flip-flop set high
D. With all flip-flops set randomly
Correct Answer:
C
Chapter: 34
Q697:
In the Johnson Counter, how many states does a 4-bit counter have?
A. 8
B. 10
C. 16
D. 4
Correct Answer:
A
Chapter: 34
Q698:
How does a Parallel In/Parallel Out shift register work?
A. Shifts data in serial
B. Loads and outputs data in parallel
C. Clears data asynchronously
D. Loads data in serial
Correct Answer:
B
Chapter: 35
Q699:
A 8-bit serial in / parallel out shift register contains the value “8”, _____ clock signal(s) will be required to shift the value completely out of the register.
A. 1
B. 2
C. 4
D. 8
Correct Answer:
D
Chapter: 35
Q700:
In asynchronous transmission when the transmission line is idle, _________
A. It is set to logic low
B. It is set to logic high
C. Remains in previous state
D. State of transmission line is not used to start transmission
Correct Answer:
B