Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
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
View Answer
A
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)
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
B