Relays – Exercise – 1

1. The relay best suited for phase fault relaying for medium transmission lines is :

(a) Mho relay
(b) Reactance relay
(c) Impedance relay
(d) None of the above

Answer
Answer : (c)
Explanation
No answer description available for this question. Let us discuss.

2. Thermal relays are used for the protection of motors against over-current owing to :

(a) Short circuit
(b) Heavy loads
(c) Earth fault
(d) All the above

Answer
Answer : (b)
Explanation
No answer description available for this question. Let us discuss.

3. For ground fault, which of the relay is preferred :

(a) Plain impedance relay
(b) Directional relay
(c) Reactance relay
(d) Over-current relay

Answer
Answer : (c)
Explanation
No answer description available for this question. Let us discuss.

4. Buchholz relay is :

(a) Located in the conservator tank
(b) Located in the transformer tank itself
(c) Connected in the pipe connecting main tank of transformer and conservator
(d) Installed in the circuit breaker

Answer
Answer : (c)
Explanation
No answer description available for this question. Let us discuss.

5. The relay used for the feeder protection is :

(a) Under-voltage relay
(b) Translay relay
(c) Thermal relay
(d) Buchholz relay

Answer
Answer : (b)
Explanation
No answer description available for this question. Let us discuss.
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