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Programmable Logic Devices MCQs

Practice Programmable Logic Devices MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Digital ElectronicsProgrammable Logic Devices

In a programmable logic array (PLA), which logic planes are normally programmable?

  • AAND plane only
  • BOR plane only
  • CBoth AND and OR planes
  • DNeither plane
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Correct Answer: C. Both AND and OR planes
Explanation: A PLA generally has programmable AND and programmable OR arrays, providing more flexible sum-of-products implementation than a PAL with a fixed OR structure.
Reference: Standard digital electronics: PLA architecture
Question 2
Digital ElectronicsProgrammable Logic Devices

Compared with a PLA, a traditional PAL typically uses?

  • AProgrammable AND array and fixed OR array
  • BFixed AND array and programmable OR array
  • CProgrammable RAM cells only
  • DNo AND-OR structure
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Correct Answer: A. Programmable AND array and fixed OR array
Explanation: A conventional PAL has a programmable AND plane feeding a fixed OR plane, while a PLA normally allows both planes to be programmed.
Reference: Standard digital electronics: PAL architecture
Question 4
Digital ElectronicsProgrammable Logic Devices

In a conventional PROM, which part is programmed by the user?

  • AThe connections representing stored data
  • BThe number of address pins after fabrication
  • CThe semiconductor supply voltage
  • DThe clock frequency only
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Correct Answer: A. The connections representing stored data
Explanation: A PROM is manufactured with a fixed decoding structure and user-programmable storage connections, allowing a desired data pattern or truth table to be permanently programmed.
Reference: Standard digital electronics: PROM