EEE MCQ: Switchgear and Protection

A switchgear or electrical switchgear is a generic term which includes all the switching devices associated with mainly power system protection. It also includes all devices associated with control, protecting (switches, relays, fuses or circuit breakers used to control & Protect), metering and regulating of electrical power system. Assembly of such devices in a logical manner forms a switchgear. This is a very basic definition of switchgear.

1. In a circuit breaker the current which exists at the instant of contact separation is known as....
2. Bucholz relay used on..
3. The SF6 gas is...
4. The rating of a wire is always expressed in
5. Oil immersion of contacts is the method of ...
6. Air blast circuit breakers for 400 kV. Power system are designed to operate in
7. Which of the following contact point metals has the highest melting point ?
8. HRC fuses are....
9. A material best suited for manufacturing of fuse wire is...
10. A fuse is normally a ...
11. The basic function of a circuit breaker is to.
12. A differential relay measures the vector difference between.
13. Thermal overload relays are used to protect the motor against over current due to.
14. Breaking capacity of the circuit breaker is usually expressed in.
15. Which of the following circuit breakers produce least arc energy?
16. Which of the following is not a part of the circuit breaker ?
17. A Merz-price protection is suitable for....
18. Which relay is used for transformer protection?
19. Which relay is used for feeders ?
20. The over-voltage surges in power systems may be caused by...
21. In a circuit breaker the current which exists at the instant of contact separation is known as
22. Oil immersion of contacts is the method of
23. The arc voltage produced in the circuit breaker is always...
24. Sparking occurs when a load is switched off because the circuit has

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