Programmable Logic Controller (PLC) MCQ Questions and Answers Quiz

11. To protect a PLC from any incoming surges from the field, an isolated device such as ____________ is used.

  1. Transformer
  2. Transducer
  3. ADC
  4. DAC

12. In PLC programming, a retentive function is one that

  1. Default points to the On State
  2. Default points to the Off State
  3. is not reset after a power cycle
  4. cannot be edited or deleted

13. An OR function implemented in Ladder logic uses

  1. normally closed contacts in series
  2. normally open contacts in series
  3. normally closed contacts in parallel
  4. normally open contacts in parallel

14. A good application for a timed interrupt in a PLC program would be

  1. A math function block
  2. A PID function block
  3. A communication function block
  4. A motor start/stop rung

15. The __________________ instruction is used to turn an output ON or OFF after its time has been on for a preset time interval

  1. retentive time
  2. timer and delay
  3. timer off delay
  4. none of these
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Programmable Logic Controller (PLC) Question and Answer

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