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Electronic Mechanic Practice Test: Protection Devices
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Electronic Mechanic Practice Test: Protection Devices
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25 Questions

1. Which formula is used to find the fusing factor?
2. What is the cause of failure of contactor due to too much heating of the no-volt coil?
3. What is the current rating of tinned copper wire 40 SWG used for rewirable fuse?
4. What is the maximum voltage rating for ‘DC’ series MCBs?
5. What is the name of the current interrupted by the circuit breaker?
6. What is the name of the fuse cartridge part marked as ‘X’?
7. What is the fusing current for a rewirable fuse?
8. What is the maximum earth fault loop impedance if an ELCB with a rated tripping current of 30 mA?
9. Which function is performed by the isolator in an electrical circuit?
10. What is the breaking capacitor of a DC series MCB?
11. What is the type of miniature circuit breaker (MCB)?
12. How much time is taken by overload relay to open motor contact at 500 percentage of full load current?
13. Why the AC relay connected to DC supply draw more current?
14. Which type of relay is used in voltage stabilizer?
15. What is the type of relay?
16. Which device opens and closes an auxiliary circuit?
17. What is the fusing factor of rewirable HRC fuse?
18. What is the trip for clearing short circuits in MCB combination circuit breaker?
19. Which relay is used for the time delay purpose?
20. What is the cause of humming noise from the starter?
21. Which relay has contact arrangement to break make or transfer contact combination?
22. Which condition the MCB is breaking open of the electrical circuit?
23. What is the name of the part marked as ‘X’ in the MCB?
24. Which device is used in electrical installations to protect from electric shock?
25. What is the fusing factor of a rewirable fuse selected for over current protection in a circuit?

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