Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q711: How is a PLD device configured for Sequential operation?
- A: Using Combinational Logic Mode
- B: By setting the OLMC to Registered Mode
- C: By programming external memory
- D: By adjusting the MUX inputs
View Answer
B
Q712: What does setting the S1 and S0 select inputs to 01 configure in a PLD?
- A: Combinational Mode
- B: Sequential Mode
- C: Registered Active-low Mode
- D: Registered Active-high Mode
View Answer
D
Q713: What is the purpose of the ISTYPE statement in a PLD device?
- A: Assigns clock inputs
- B: Declares input as Registered or Combinational
- C: Configures memory allocation
- D: Adjusts power levels
View Answer
B
Q714: Which operator is used in logic descriptions to indicate a Registered output?
- A: :=
- B: :>
- C: =
- D: &
View Answer
A
Q715: What does the ‘.CLK’ extension in an ABEL statement indicate?
- A: Clear signal
- B: Inverted output
- C: Clocked flip-flop
- D: Enable input
View Answer
C
Q716: What is an 8-bit Serial In/Parallel Out shift register used for?
- A: Parallel data storage
- B: Serial data output
- C: Serial data input
- D: Converting serial data to parallel data
View Answer
D
Q717: How is the clear signal used in an 8-bit Serial In/Parallel Out shift register?
- A: To enable the shift register
- B: To clear all flip-flops asynchronously
- C: To start data input
- D: To set the clock signal
View Answer
B
Q718: What type of output does the Q0 output in an ABEL statement represent?
- A: Active-low
- B: Active-high
- C: Inverted output
- D: Enable output
View Answer
B
Q719: What operation does the first vector specify in the test vectors of an ABEL file?
- A: Inhibits the shift operation
- B: Resets the counter
- C: Shifts in logic 1
- D: Clears the register
View Answer
D
Q720: In a 4-bit Parallel In/Serial Out shift register, what is the purpose of the SHLD input?
- A: Shift data
- B: Load data
- C: Clear register
- D: Enable clock
View Answer
B