Relays – 1 – 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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

5. The relay used for the feeder protection is :

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

ANSWER

EXPLANATION

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