Practice MCQ Questions and answers on Maintenance & Testing of Electrical Equipment Test Question

A. The specified limits of ratio error and phase angle error.

B. The ratio of rated short time current to rated primary current.

C. A specification by the manufacturer at which CT performs with the specified accuracy.

D. The phase angle between primary current vector and reversed secondary current vector.

A. The specified limits of ratio error and phase angle error.

B. The ratio of rated short time current to rated primary current.

C. A specification by the manufacturer at which CT performs with the specified accuracy.

D. The phase angle between primary current vector and reversed secondary current vector.

A. 5 cycles

B. 14 cycles

C. 9 cycles

D. 13 cycles

A. Earth fault relay connected in neutral to earth circuit.

B. Earth fault relay connected in three phase residual secondary circuit of C T secondaries

C. Differential protection

D. All of these

E. None of these

A. For protective circuits between C Ts, V Ts, and relays

B. To sense the fault and close trip circuit for circuit breaker

C. Opening and fault clearing

D. All of these

E. None of these

A. Repair tests

B. Maintenance testing

C. Manufacturers tests

D. All of these

E. None of these

A. Hydrogen

B. Nitrogen

C. Carbon dioxide

D. Helium

A. Totally enclosed

B. Drip splash or hose proof

C. Open end bracket

D. All of these

A. Self cooled open machine fan mounted on the shaft

B. Totally enclosed machine frame cooled no extra fan

C. Totally enclosed machines frame and tubes externally and internal fault.

D. Inlet pipe self ventilated machines fan mounted on the shaft.

A. 15 – 20 % of the rated voltage

B. 20 – 25 % of the rated voltage

C. 5 – 10 % of the rated voltage

D. 0 – 5 % of the rated voltage