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Instrument Mechanic Practice Test: Programmable Logic Controller
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Instrument Mechanic Practice Test: Programmable Logic Controller
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25 Questions

1. Which of the following cannot be an input that is given to the PLC?
2. How is the speed of operation of conventional relay system as compared to digital controllers?
3. ____________ language can be generated separately and then downloaded separately in the PC
4. PLC means ____________ Logic controller.
5. Unitary PLC has 20 inputs and ____________ outputs.
6. A good application for a timed interrupt in a PLC program would be:
7. The _____________ instruction is used to turn an output on or off after its timer has been on for a preset time interval.
8. In PLC the scan time refers to the amount of time in which
9. Ladder logic programming consists primarily of
10. _____________ of PLCs can be done in very little time.
11. Which one of the following is not a PLC manufacturer?
12. In a PLC, the scan time refers to the amount of time in which ........
13. PLC’s analog input/output has
14. When __________ contacts are actuated , they disrupt the power supply through them.
15. The PLC is used in ___________
16. Solenoid, lamps, motors are connected to
17. Ladder logic programming consists of :
18. To protect a PLC from any incoming surges from the field , isolates devices such as _____________ are used.
19. PLCs having less than ____________ inputs and outputs are called as small PLC
20. In OR function implemented in ladder logic uses:
21. What is the first designing an effective PLC control system
22. PLC can be ____________ in plant to change the sequence of operation.
23. Programming language of PLC is
24. The difference between online and offline PLC programming is .........
25. In PLC programming , a retentive function is one that:

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