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Electrician Practice Test: Control Panel Wiring
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Electrician Practice Test: Control Panel Wiring
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25 Questions

1. What is the purpose of DIN-rail used in control panel wiring?
2. Why sequential control of motors is required in an industrial application?
3. Which cable ties are used to bunch the wires?
4. Which material is used to make open frame bimetallic adjustable thermostat contacts?
5. Which device controls the operations in sequential control systems?
6. What happens, if time delay relay of a auto star delta starter still in closed condition after starting?
7. What is the name of the accessory used in control panel wiring?
8. Which device is avoided in the panel board assembly?
9. What is the purpose of thermal over load relay in control panel?
10. What is the criteria to select the contactor?
11. Which supply indicates by the colour of conductor exhibited on Red, Blue and Black?
12. What is the purpose of control transformer used in control panel wiring?
13. Which switch is operated at OFF load condition?
14. Which is the correct sequence operation of contactors for operating automatic star delta strarter?
15. Which device prevents flare out of stripped and stranded cables in the panel board?
16. Which type of device protects motors from overheating and over loading in a panel board?
17. Why the motor is not changing the direction, if reverse push button is pressed in forward and reverse control star delta starter?
18. Which circuit, the limit switches are used?
19. What essential feature to be considered while designing a layout of control panel?
20. How the control circuit voltage and power in a contactor are to be selected?
21. What is the use of G’ channels in control panel?
22. What is the name of the device marked X’?
23. What is the name of the wiring accessory used in control panel wiring?
24. What is the function of limit switch in control panel wiring?
25. Which switch with an actuator is operated by the motion of a machine or part of an object?

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