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MCQs 1: What is switchgear?

An apparatus used for switching, controlling and protecting the electrical circuits and equipments. It detects the faults only. It corrects the faults only. All of the above.
Answer Explanation

MCQs 2: What is the primary principle of a fuse?

Open the circuit. Protect the appliance. Protect the line. Prevent excess current from flowing into the line.
Answer Explanation

MCQs 3: When does the circuit breaker operate in the line?

When power is to be supplied. When the line is to be tested. Whenever the fault occurs in the line. Whenever the switch and the relay has to be operated.
Answer Explanation

MCQs 4: Which device sends the information to the circuit breaker to interrupt the circuit in case of fault?

Switch Relay Circuit breaker itself does this function. Fuse
Answer Explanation

MCQs 5: Which material is used for the manufacture of bus bars?

Aluminium rods. Copper rods. Any conducting material. Made of silver.
Answer Explanation

MCQs 6: How is the bus bars rated?

Current only. Voltage only. Current, voltage and frequency. Current, voltage, frequency and short circuit current.
Answer Explanation

MCQs 7: Which among these are the main characteristics of a fuse element?

Low melting point High conductivity Least deterioration due to oxidation All of the above
Answer Explanation

MCQs 8: Which among the following statement is true related to fuse?

Greater the current smaller is the time taken by the fuse to blow out. Greater the current greater is the time taken by the fuse to blow out. The current is directly proportion to the blow out time of fuse. Is dependent on the temperature and atmospheric conditions.
Answer Explanation

MCQs 9: Which among these is the least expensive protection for over current in low voltage system?

Rewirable fuse. Isolator Circuit breaker. Air breaker switch.
Answer Explanation

MCQs 10: For a current upto 10A which material is used as the fusing element?

Copper Silver Alloy of lead and tin Zinc
Answer Explanation

MCQs 11: What is fusing factor?

The ratio of current rating of the fuse to the minimum fusing current The ratio of minimum fusing current to the current rating of the fuse The ratio of maximum fusing current to the current rating of the fuse The ratio of minimum fusing current to the voltage rating of the fuse
Answer Explanation

MCQs 12: What should be the value of fusing factor?

Equal to zero Equal to one Less than one More than one
Answer Explanation

MCQs 13: What is the maximum current upto which fuses can be used?

25 A 50 A 75 A 100 A
Answer Explanation

MCQs 14: What is the typical value of the pre arcing time?

0.1 0.01 0.001 0.0001
Answer Explanation

MCQs 15: A fuse wire of circular cross section has a radius of 0.8mm. The wire blows off at a current of 9A. What will be the radius of the wire that will blow off at a current of 1A?

0.2 mm 0.18 mm 0.28 mm 0.3 mm
Answer Explanation

MCQs 16: Which among these tests are performed to check the nation or international standards?

Type test. Production tests. Site checks. All of the above.
Answer Explanation

MCQs 17: If the strands of the fusing wire are twisted, what happens to the fusing current?

Increases Reduces No change/ remains same Depends on the value of current, increases or decreases.
Answer Explanation

MCQs 18: What is the cut off current in the fuse?

Maximum value actually reached. Rms value actually reached. Average value actually reached. None of the above
Answer Explanation

MCQs 19: What is the advantage of HRC fuses over Rewirable fuses?

High speed operation High rupturing capacity No ageing effect. All of the above.
Answer Explanation

MCQs 20: Which material is used in the liquid type of fuse?

SF6 Distilled water Carbon tetra chloride. Mineral oil / transformer oil
Answer Explanation

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