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Basic Electrical MCQs

Study 121 Electrical Engineering MCQs with correct answers and explanations.

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61Electrical EngineeringMedium

Resistance of a material always decreases if________?

Anumber of free electrons available become more

Btemperature of material is increased

Ctemperature of material is decreased

Dnone of the above is correct

Correct answer

A. number of free electrons available become more

Explanation

The correct answer is number of free electrons available become more.

62Electrical EngineeringMedium

Whether circuit may be AC. or D. C. one, following is most effective in reducing the magnitude of the current?

AReactor

BInductor

CResistor

DCapacitor

Correct answer

C. Resistor

Explanation

The correct answer is Resistor.

63Electrical EngineeringMedium

The insulation on a current carrying conductor is provided________?

Aboth of above factors

Bto prevent shock

Cnone of above factors

Dto prevent leakage of current

Correct answer

A. both of above factors

Explanation

The correct answer is both of above factors.

64Electrical EngineeringMedium

The resistance of a few meters of wire conductor in closed electrical circuit is________?

Alow

Bvery high

Chigh

Dpractically zero

Correct answer

D. practically zero

Explanation

The correct answer is practically zero.

65Electrical EngineeringMedium

Internal resistance of ideal current source is?

A100 ohms

Bzero

Cinfinite

Dfinite

Correct answer

C. infinite

Explanation

Ideal current source delivers energy at specified current, which is independent on voltage across the load. The internal resistance must become very high to deliver maximum current.

66Electrical EngineeringMedium

The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true________?

AThe voltage across each bulb is not same

BNone of the above

CThe current through each bulb in same

DThe power dissipation in each bulb is not same

Correct answer

C. The current through each bulb in same

Explanation

The correct answer is The current through each bulb in same.

67Electrical EngineeringMedium

The number of electrons in the outer most orbit of carbon atom is________?

Correct answer

D. 4

Explanation

The correct answer is 4.

68Electrical EngineeringMedium

When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will________?

Anone of the above

Bincrease

Cdecrease

Dremain constant

Correct answer

B. increase

Explanation

The correct answer is increase.

69Electrical EngineeringMedium

When current flows through heater coil it glows but supply wiring does not glow because________?

Asupply wiring is covered with insulation layer

Bsupply wires are made of superior material

Cresistance of heater coil is more than the supply wires

Dcurrent through supply line flows at slower speed

Correct answer

C. resistance of heater coil is more than the supply wires

Explanation

The correct answer is resistance of heater coil is more than the supply wires.

70Electrical EngineeringMedium

Conductance : mho :: ________?

Aresistance : ohm

Binductance : farad

Clumen : steradian

Dcapacitance : henry

Correct answer

A. resistance : ohm

Explanation

The correct answer is resistance : ohm.

When current flows through heater coil it glows but supply wiring does not glow because________?

Asupply wiring is covered with insulation layer

Bsupply wires are made of superior material

Cresistance of heater coil is more than the supply wires

Dcurrent through supply line flows at slower speed

Correct answer

C. resistance of heater coil is more than the supply wires

Explanation

The correct answer is resistance of heater coil is more than the supply wires.