Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 19
Q461:
What distinguishes a Programmable Logic Array (PLA) from a PROM?
A. The PLA has programmable AND and OR arrays
B. The PLA has a fixed OR array and a programmable AND array
C. The PLA is not programmable at all
D. The PLA has only a programmable OR array
Correct Answer:
A
Chapter: 19
Q462:
Which type of PLD is designed to overcome delays and complex circuitry associated with PLAs?
A. Programmable Array Logic (PAL)
B. Programmable Read-Only Memory (PROM)
C. Generic Array Logic (GAL)
D. Programmable Logic Array (PLA)
Correct Answer:
A
Chapter: 19
Q463:
What is a key difference between a Generic Array Logic (GAL) and a Programmable Array Logic (PAL)?
A. The GAL has a reprogrammable AND array
B. The PAL has a reprogrammable AND array
C. The GAL uses a fixed OR array
D. The PAL uses a reprogrammable AND array
Correct Answer:
A
Chapter: 19
Q464:
What type of output does a PAL typically provide?
A. Combinational Output, Combinational I/O, Programmable Polarity
B. Only Combinational Output
C. Only Combinational I/O
D. Only Programmable Polarity
Correct Answer:
A
Chapter: 19
Q465:
In a PAL, how is the output logic configured for a combinational function?
A. By activating or deactivating a tri-state buffer
B. By connecting the output to a fixed OR gate
C. By programming an XOR gate
D. By reprogramming the AND array
Correct Answer:
A
Chapter: 19
Q466:
How are outputs configured in a PAL for programmable polarity?
A. By using an XOR gate at the output
B. By using a fixed OR array
C. By using a reprogrammable AND array
D. By using a fixed AND array
Correct Answer:
A
Chapter: 19
Q467:
What does the numbering of a PAL device indicate?
A. Number of inputs, active-low/high, or programmable polarity
B. Number of outputs and the type of logic gates used
C. Only the type of package and speed
D. Only the temperature range of the device
Correct Answer:
A
Chapter: 19
Q468:
What is the purpose of the input buffers in a PLA?
A. To provide both complemented and un-complemented input signals
B. To amplify the input signals
C. To store the input signals
D. To route input signals to multiple outputs
Correct Answer:
A
Chapter: 19
Q469:
How does a PLA differ from a PAL in terms of programming?
A. A PLA has both programmable AND and OR arrays
B. A PLA has only a programmable AND array
C. A PLA has a fixed OR array and a programmable AND array
D. A PLA has fixed AND and OR arrays
Correct Answer:
A
Chapter: 20
Q470:
What is the output of the first OR gate in the 4x3 PLA device when P1 is 0?
A. 1
B. zero
C. 1 or 0
D. Depends on inputs
Correct Answer:
B
Chapter: 20
Q471:
Which Odd-Prime numbers can be detected by a 4x3 PLA with six product terms?
A. 1, 3, 5, 7, 11, 13
B. 1, 2, 3, 5, 7, 11, 13, 17
C. 1, 2, 4, 7, 11, 13
D. 1, 3, 5, 7
Correct Answer:
A
Chapter: 20
Q472:
What type of logic is used in the GAL instead of fuses E2?
A. CMOS logic
B. Bipolar logic
C. TTL logic
D. ECL logic
Correct Answer:
A
Chapter: 20
Q473:
How many inputs and outputs does the GAL22V10 have?
A. 12 inputs, 10 I/Os
B. 10 inputs, 12 I/Os
C. 12 inputs, 12 I/Os
D. 8 inputs, 10 I/Os
Correct Answer:
A
Chapter: 20
Q474:
In GAL22V10, what does the select input S1 control in the 2-to-1 MUX?
A. Routing the input to the AND array
B. Selecting the output of the OR gate
C. Switching between input and output
D. Controlling the tri-state buffer
Correct Answer:
C
Chapter: 20
Q475:
What does the OLMC in the GAL22V10 consist of?
A. A flip-flop and MUX
B. A simple buffer
C. An AND gate array
D. A shift register
Correct Answer:
A
Chapter: 20
Q476:
How does the Simple Mode in GAL16V8 configure outputs?
A. As dedicated combinational outputs
B. As sequential outputs
C. As analog outputs
D. As variable outputs
Correct Answer:
A
Chapter: 20
Q477:
Which ABEL notation represents an XOR operation?
A. A$B
B. A&B
C. A#B
D. !A$B
Correct Answer:
A
Chapter: 20
Q478:
The capability that allows the PLDs to be programmed after they have been installed on a circuit board is called ________
A. Radiation-Erase programming method (REPM)
B. In-System Programming (ISP)
C. In-chip Programming (ICP)
D. Electronically-Erase programming method(EEPM)
Correct Answer:
B
Chapter: 20
Q479:
The ABEL symbol for “OR” operation is
A. !
B. &
C. #
D. $
Correct Answer:
C
Chapter: 20
Q480:
In the ABEL notation, what does the symbol “!” represent?
A. NOT operation
B. AND operation
C. OR operation
D. XOR operation
Correct Answer:
A