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MCQs 1: What is the major cause of the failure of the circuit breaker?

Trip circuit open Trip latch defective Spring defective All of these
Answer Explanation

MCQs 2: What is the purpose of back up protection?

To increase the speed To increase the reach To leave no blind spot To guard against failure of primary
Answer Explanation

MCQs 3: What is the actuating quantity for the relays?

Magnitude Frequency Phase angle All of these
Answer Explanation

MCQs 4: Protective relays can be designed to respond to ___________.

Light intensity, impedance Temperature, resistance, reactance Voltage and current All of these
Answer Explanation

MCQs 5: On what factor does the operating speed of the relay depend?

Rate of flux built up Armature core air gap Spring tension All of these
Answer Explanation

MCQs 6: Plug setting of a electromagnetic relay can be altered by varying

Number of ampere turns Air gap of magnetic path Adjustable back stop None of these
Answer Explanation

MCQs 7: The most efficient torque producing actuating structure for the induction type relays is

Shaded pole structure Watt hour meter structure Induction cup structure Single induction loop structure
Answer Explanation

MCQs 8: The fuse blows off by___________?

burning arcing melting none of the above
Answer Explanation

MCQs 9: H.R.C. fuse, as compared to a rewirable fuse, has_________________?

no ageing effect high speed of operation high rupturing capacity all of the above
Answer Explanation

MCQs 10: An isolator is installed_____________?

to operate the relay of circuit breaker as a substitute for circuit breaker always independent of the position of circuit breaker generally on both sides of a circuit breaker
Answer Explanation

MCQs 11: Protection by fuses is generally not used beyond__________?

20 A 50 A 100 A 200 A
Answer Explanation

MCQs 12: Oil switches are employed for_____________?

low currents circuits low voltages circuits high voltages and large currents circuits all circuits
Answer Explanation

MCQs 13: A fuse in a motor circuit provides protection against__________?

overload short-circuit and overload open circuit, short-circuit and overload none of the above
Answer Explanation

MCQs 14: On which of the following effects of electric current a fuse operates ?

Photoelectric effect Electrostatic effect Heating effect Magnetic effect
Answer Explanation

MCQs 15: The fuse rating is expressed in terms of_____________?

current voltage VAR kVA
Answer Explanation

MCQs 16: The power loss is an important factor for the design of_______________?

transmission line motor generator feeder
Answer Explanation

MCQs 17: The material used for fuse must have_____________?

low melting point and high specific resistance low melting point and -low specific resistance high melting point and low specific resistance low melting point and any specific resistance
Answer Explanation

MCQs 18: A fuse is connected_______________?

in series with circuit in parallel with circuit either in series or in parallel with circuit none of the above
Answer Explanation

MCQs 19: The steady state stability of the power system can be increased by_____________?

connecting lines in parallel connecting lines in series using machines of high impedance reducing the excitation of machines none of the above
Answer Explanation

MCQs 20: Series capacitors are used to_________________?

compensate for line inductive reactance compensate for line capacitive reactance improve line voltage none of the above
Answer Explanation

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