Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 20
Q481:
What is the advantage of In-System Programming (ISP) capability in PLDs?
A. Allows programming after installation
B. Reduces programming time
C. Enhances device speed
D. Eliminates need for test vectors
Correct Answer:
A
Chapter: 21
Q482:
Q2 :=Q1 OR X OR Q3 The above ABEL expression will be
A. Q2:= Q1 $ X $ Q3
B. Q2:= Q1 # X # Q3
C. Q2:= Q1 & X & Q3
D. Q2:= Q1 ! X ! Q3
Correct Answer:
B
Chapter: 21
Q483:
What is the main purpose of the GAL16V8?
A. To replace microcontrollers
B. To replace existing PALs
C. To enhance data storage
D. To improve graphics processing
Correct Answer:
B
Chapter: 21
Q484:
How many input/output pins does the GAL16V8 have?
A. 10
B. 12
C. 16
D. 20
Correct Answer:
C
Chapter: 21
Q485:
In which mode does the GAL16V8 perform combinational logic?
A. Simple Mode
B. Complex Mode
C. Registered Mode
D. All of the above
Correct Answer:
A
Chapter: 21
Q486:
Which of the following is true about the tri-state buffer in GAL16V8?
A. It can only be connected to Vcc
B. It can be connected to GND only
C. It can be controlled externally
D. It can be connected to an external clock
Correct Answer:
C
Chapter: 21
Q487:
How many product terms can each OLMC in GAL16V8 handle?
A. 16
B. 32
C. 64
D. 8
Correct Answer:
B
Chapter: 21
Q488:
What does the feedback configuration in the OLMC allow?
A. Only combinational logic
B. Only sequential logic
C. Both combinational and sequential logic
D. No feedback configuration
Correct Answer:
C
Chapter: 21
Q489:
In Simple Mode, what configuration allows for a dedicated input?
A. Setting tri-state buffer to Vcc
B. Setting tri-state buffer to GND
C. Connecting feedback to AND gate
D. Configuring XOR gate for output polarity
Correct Answer:
B
Chapter: 21
Q490:
Which ABEL symbol represents the XOR operation?
A. !
B. &
C. #
D. $
Correct Answer:
D
Chapter: 21
Q491:
How are Boolean expressions represented in ABEL?
A. Using set notations only
B. Using equations and truth tables
C. Only using state diagrams
D. Using circuit diagrams
Correct Answer:
B
Chapter: 21
Q492:
What is a feature of the Complex Mode in GAL16V8?
A. It supports feedback only
B. It uses logical expressions for tri-state control
C. It can only use 4 product terms
D. It supports dedicated inputs only
Correct Answer:
B
Chapter: 21
Q493:
Which ABEL notation represents the AND operation?
A. !
B. &
C. #
D. $
Correct Answer:
B
Chapter: 21
Q494:
In ABEL, how are multiple input and output variables typically grouped?
A. Using sets
B. Using truth tables
C. Using state diagrams
D. Using simple equations
Correct Answer:
A
Chapter: 21
Q495:
What does the term "test vectors" refer to in ABEL?
A. The syntax for defining inputs and outputs
B. The method for simulating the logic circuit
C. The method for documenting the design
D. The format for device declarations
Correct Answer:
B
Chapter: 21
Q496:
What section in the ABEL input file specifies the PLD device to be programmed?
A. Declarations
B. Logic Descriptions
C. Test Vectors
D. Documentation
Correct Answer:
A
Chapter: 21
Q497:
How are state diagrams used in ABEL?
A. For Combinational Logic Circuits
B. For Sequential Logic Circuits
C. For input/output variable grouping
D. For defining sets
Correct Answer:
B
Chapter: 22
Q498:
What is the function of a Quad 1-of-4 MUX?
A. Select one of four inputs from a single output
B. Select one of four outputs from a single input
C. Route input to multiple outputs
D. Route multiple inputs to a single output
Correct Answer:
A
Chapter: 22
Q499:
How many multiplexers are in a Quad 1-of-4 MUX?
A. 2
B. 4
C. 8
D. 16
Correct Answer:
B
Chapter: 22
Q500:
What is the total number of inputs for a Quad 1-of-4 MUX?
A. 8
B. 12
C. 16
D. 4
Correct Answer:
C