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Electrician Practice Test: Relay And Circuit Breakers
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Electrician Practice Test: Relay And Circuit Breakers
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25 Questions

1. What is the pick-up voltage in a over voltage relay indicated?
2. In Which of the following device the load is protected by G’ series MCB?|
3. What is the name of circuit breaker?
4. The tripping circuit is__________
5. Which component ensures the safety of the line from damage
6. Arc interruption is done by
7. What is the cause for the defect if phase to ground fault on the transmission line?
8. What is the function of relay to the breaking operation of circuit breaker in control circuit
9. What is the purpose of back up protection?
10. Back up protection is needed for
11. Desired tripping of a circuit breaker is
12. What is the actuating quantity for the relays?
13. What is the defect in an air circuit breaker, if trips intermittently on loading?
14. Ionization in circuit breakers is facilitated by
15. What is the effect, if the test button marked as X’ is closed permanently in ELCB?
16. An instantaneous relay is
17. Which circuit breaker is used as a switch and protective device in the domestic wiring circuit?
18. An impedance relay is used for
19. Relay gets its operating energy from
20. Which relay hold their contacts in position after power is cutoff?
21. Time between energization of trip coil and separation of contacts is called
22. In circuit breaker, to facilitate arc quenching, dielectric strength can be increased by
23. Rate of rise restriking voltage depends upon
24. An ideal circuit breaker should offer
25. Relays for transmission line protection are

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