Switchgear and protection. Part – 1

1. Material suitable for manufacturing of fuse wire is

A. Copper

B. Silver

C. Zinc         

D. Aluminum 

2. For protection of parallel feeder fed from one end, the relay required are

A. Non directional relay source end, directional relay at load end

B. Non directional relay at both end

C. Directional relay at source end, non directional relay at load end

D. Directional relay at both end

3. Merz price protection is employed for protection at

A. Alternators

B. Transformer

C. transmission line

D. both A and B

4. The rating of fuse wire is always expressed in

A. Volts

B. Ampere

C. Ampere volt

D. Ampere hour

5. The most efficient torque producing actuating for induction type relay is

A. Shaded pole structure

B. Watt hour meter structure

C. Induction cup structure

D. Single induction loop structure

6. Zero-sequence fault current is absent when fault is

A. Single line to ground

B. Line to line to ground

C. Line to line fault

D. Line to line to line to ground

7. The circuit breaker is widely used for __

A. Make and break the circuit

B. To make circuit

C. To break circuit

D. To provide protection against lightning surge

8. For internal faults in generator the primary protection is provided by

A. Earth fault relay

B. Differential relay

C. Induction type inverse definite minimum time relay

D. Definite minimum time relay

9. For a normal wire, the approximate value of fusing current is given by

A. 1 = K(d)^3/2

B. 1 = K(d)³

C. 1 = K(d)^3/4

D. 1 = (Kd)^3/2

10. The rate of rise of restricting voltage (RRRV) depends upon the

A. Inductance and capacitance of the system

B. Capacitance of system

C. Inductance of system

D. Type of CB