Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 346
Q401:
The key components of an FPGA are ________.
A. Logic blocks and Configurable Logic Blocks
B. Look Up Table and Configurable Logic Blocks
C. Flip Flops and LUTs
D. D flip flops and Look Up Tables
Correct Answer:
B
Chapter: 336
Q402:
A flip-flop used for storing data in binary format is _______.
A. D flip-flop
B. S-R flip-flop
C. J-K flip-flop
D. T flip-flop
Correct Answer:
A
Chapter: 349
Q403:
The configuration memory used to store configuration bits in an FPGA is _________
A. SRAM
B. DRAM
C. Flash memory
D. EPROM
Correct Answer:
A
Chapter: 245
Q404:
The output of a combinational circuit depends on ________.
A. Present input
B. Past output
C. Future input
D. Past input
Correct Answer:
A
Chapter: 356
Q405:
A Shift Register is used to ________.
A. Store data temporarily
B. Convert data from serial to parallel and vice-versa
C. Convert data from analog to digital
D. Store data permanently
Correct Answer:
B
Chapter: 245
Q406:
The output of a combinational logic circuit is determined by ________.
A. The previous state
B. The current state
C. The previous state and input
D. The current state and input
Correct Answer:
D
Chapter: 380
Q407:
A 4-bit counter will have a maximum count of ________.
A. 8
B. 12
C. 16
D. 24
Correct Answer:
C
Chapter: 16
Q408:
In a 2-to-4 decoder, how many output lines will be activated when two input lines are at logic 1?
A. 1
B. 2
C. 3
D. 4
Correct Answer:
A
Chapter: 373
Q409:
In a 4-bit binary counter, how many flip-flops are required?
A. 2
B. 3
C. 4
D. 5
Correct Answer:
C
Chapter: 374
Q410:
What is the number of distinct states that a 3-bit counter can have?
A. 6
B. 8
C. 10
D. 12
Correct Answer:
B
Chapter: 161
Q411:
A 3-to-8 decoder has how many possible output lines?
A. 3
B. 4
C. 8
D. 16
Correct Answer:
C
Chapter: 16
Q412:
A frequency divider circuit is used to ________.
A. Increase the frequency
B. Decrease the frequency
C. Maintain the frequency
D. Randomize the frequency
Correct Answer:
B
Chapter: 16
Q413:
In the 16-bit ALU with Look-Ahead Carry Generator, how is Carry In for ALU1 determined?
A. Directly from input A
B. From the Look-Ahead Carry Generator
C. From the previous ALU's Carry Out
D. Directly from input B
Correct Answer:
B
Chapter: 16
Q414:
What does the output C1 from the Look-Ahead Carry Generator represent?
A. Carry Out of ALU0
B. Carry In to ALU1
C. Group Carry for ALU0
D. Group Carry for ALU1
Correct Answer:
B
Chapter: 16
Q415:
What is the primary role of a 4-bit Comparator?
A. To compare two 4-bit numbers and determine equality
B. To perform arithmetic operations on 4-bit numbers
C. To generate carry bits
D. To count the number of 1s in a 4-bit number
Correct Answer:
A
Chapter: 16
Q416:
In a cascaded 4-bit Comparator, what happens if the most significant bits are equal?
A. The least significant bits are compared
B. The least significant bits are ignored
C. The comparison is reset
D. The system generates an error
Correct Answer:
A
Chapter: 16
Q417:
What is the main use of the 74HC85 MSI chip?
A. For 2-bit comparisons only
B. To decode 2-to-4 binary codes
C. For cascading multiple 4-bit Comparators
D. To perform 16-bit arithmetic operations
Correct Answer:
C
Chapter: 16
Q418:
What type of outputs does the 74LS139 MSI chip have?
A. Active-high outputs
B. Active-low outputs
C. Both active-high and active-low outputs
D. None of the above
Correct Answer:
B
Chapter: 16
Q419:
What happens to the outputs of a 2-to-4 Decoder when the input is 00?
A. O0 is activated, others are deactivated
B. O1 is activated, others are deactivated
C. O2 is activated, others are deactivated
D. O3 is activated, others are deactivated
Correct Answer:
A
Chapter: 16
Q420:
How are the cascading inputs of a 2-bit Iterative Circuit based Comparator connected?
A. To fixed logic inputs
B. To cascading outputs of the next module
C. To ground and Vcc
D. Directly to each other
Correct Answer:
A