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MCQs 1: Which among these systems is an auxiliary plant in a power system?

Fuel oil system Raw water system Transformer oil plant All of these None of these
Answer Explanation

MCQs 2: Which among these require a low voltage DC source?

Telemetering and communication Uninterrupted power supply The protective relays and the trip circuit All of these None of these
Answer Explanation

MCQs 3: Which circuit among the following requires a supply of 48 V DC source?

Trip coils and closing coils Micro wave protection and communication Dc measuring instruments All of these None of these
Answer Explanation

MCQs 4: How is an electrochemical cell rated if ‘n’ cells are connected in series?

Ah (ampere hour) n Ah Ah / n nV / Ah
Answer Explanation

MCQs 5: A primary cell is chemically _____________________.

Irreversible Reversible Reversible only once Reversible upto five times
Answer Explanation

MCQs 6: Which element is used as an anode in a dry cell?

Carbon Zinc Lead Zinc sulphate
Answer Explanation

MCQs 7: Which gel ensures the dryness of the incoming air in the breather?

Potassium gel Silica gel Carbon gel All of these
Answer Explanation

MCQs 8: Which cooling system is employed for large transformers?

Oil natural oil forced Oil natural air forced Oil forced air forced Both (b) and (c) All of these
Answer Explanation

MCQs 9: Which among the following safety devices are provided on the power transformers?

Marshalling kiosk Vacuum gauge Pressure relief gauge All of these None of these
Answer Explanation

MCQs 10: What is the use of current transformers?

Stepping up AC current Measuring and protection Stepping down AC current Both (b) and (c) All of these
Answer Explanation

MCQs 11: What is rated burden in current transformers?

The specified limits of ratio error and phase angle error. The ratio of rated short time current to rated primary current. A specification by the manufacturer at which CT performs with the specified accuracy. The phase angle between primary current vector and reversed secondary current vector.
Answer Explanation

MCQs 12: What is over current factor?

The specified limits of ratio error and phase angle error. The ratio of rated short time current to rated primary current. A specification by the manufacturer at which CT performs with the specified accuracy. The phase angle between primary current vector and reversed secondary current vector.
Answer Explanation

MCQs 13: What is the minimum deionisation time necessary for auto reclosing in a circuit breaker if the voltage of transmission line is 132 kV?

5 cycles 14 cycles 9 cycles 13 cycles
Answer Explanation

MCQs 14: Which among the following device is connected to provide protection against phase to earth insulation failure?

Earth fault relay connected in neutral to earth circuit. Earth fault relay connected in three phase residual secondary circuit of C T secondaries Differential protection All of these None of these
Answer Explanation

MCQs 15: What is the function of control cables?

For protective circuits between C Ts, V Ts, and relays To sense the fault and close trip circuit for circuit breaker Opening and fault clearing All of these None of these
Answer Explanation

MCQs 16: Which among these tests are performed periodically?

Repair tests Maintenance testing Manufacturers tests All of these None of these
Answer Explanation

MCQs 17: Which among these gases is not used as a coolant?

Hydrogen Nitrogen Carbon dioxide Helium
Answer Explanation

MCQs 18: Which enclosures are preferred for preventing entry of falling water or dirt?

Totally enclosed Drip splash or hose proof Open end bracket All of these
Answer Explanation

MCQs 19: What does IC 01 describe?

Self cooled open machine fan mounted on the shaft Totally enclosed machine frame cooled no extra fan Totally enclosed machines frame and tubes externally and internal fault. Inlet pipe self ventilated machines fan mounted on the shaft.
Answer Explanation

MCQs 20: What is the maximum permissible voltage drop that can be sustained while starting an electrical rotating machine?

15 – 20 % of the rated voltage 20 – 25 % of the rated voltage 5 – 10 % of the rated voltage 0 – 5 % of the rated voltage
Answer Explanation

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