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Basic Electrical MCQs

Study 121 Electrical Engineering MCQs with correct answers and explanations.

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31Electrical EngineeringMedium

The minimum charge on an ion is________?

Aequal to the charge of an electron

Bequal to the atomic number of the atom

Cequal to the charge of the number of electrons in an atom (#) zero

Correct answer

A. equal to the charge of an electron

Explanation

The correct answer is equal to the charge of an electron.

32Electrical EngineeringMedium

A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will________

Aremain same

Bincrease

Cheater will burn out

Ddecrease

Correct answer

B. increase

Explanation

The correct answer is increase.

33Electrical EngineeringMedium

All of the following are equivalent to watt except________?

Aamperes/volt

Bamperes x volts

C(amperes) ohm

Djoules/seC.

Correct answer

A. amperes/volt

Explanation

The correct answer is amperes/volt.

34Electrical EngineeringMedium

Inductor does not allow the sudden change of

Acurrent

Bpower

Cvoltage

DNone of the above

Correct answer

A. current

Explanation

Voltage developed across an inductor is expressed bY Sudden change of current means di will change at dt → 0 (dt tends to zero), so sudden change of current means infinite voltage. Therefore it is not possible.

35Electrical EngineeringMedium

When electric current passes through a metallic conductor, its temperature rises. This is due to________?

Amutual collisions between metal atoms

Bcollisions between conduction electrons and atoms

Cmutual collisions between conducting electrons

Dthe release of conduction electrons from parent atoms

Correct answer

B. collisions between conduction electrons and atoms

Explanation

The correct answer is collisions between conduction electrons and atoms.

36Electrical EngineeringMedium

Insulating materials have the function of________?

Astoring very high currents

Bpreventing a short circuit between conducting wires

Cconducting very large currents

Dpreventing an open circuit between the voltage source and the load

Correct answer

B. preventing a short circuit between conducting wires

Explanation

The correct answer is preventing a short circuit between conducting wires.

37Electrical EngineeringMedium

When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is________?

AD. C.

BA. C.

Cnone of the above

Dany of above two

Correct answer

A. D. C.

Explanation

The correct answer is D. C..

38Electrical EngineeringMedium

A glass rod when rubbed with silk cloth is charged because________?

Aits atoms are removed

Bit takes in proton

Cit gives away positive charge

Dit gives away electrons

Correct answer

D. it gives away electrons

Explanation

The correct answer is it gives away electrons.

39Electrical EngineeringMedium

If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes________?

A0.4 ohm

B1.0 ohm

C0.6 ohm

D0.8 ohm

Correct answer

A. 0.4 ohm

Explanation

The correct answer is 0.4 ohm.

40Electrical EngineeringMedium

Voltage dependent resistors are usually made from________?

ACharcoal

BGraphite

CNichrome

DSilicon Carbide

Correct answer

D. Silicon Carbide

Explanation

The correct answer is Silicon Carbide.

When electric current passes through a metallic conductor, its temperature rises. This is due to________?

Amutual collisions between metal atoms

Bcollisions between conduction electrons and atoms

Cmutual collisions between conducting electrons

Dthe release of conduction electrons from parent atoms

Correct answer

B. collisions between conduction electrons and atoms

Explanation

The correct answer is collisions between conduction electrons and atoms.

Insulating materials have the function of________?

Astoring very high currents

Bpreventing a short circuit between conducting wires

Cconducting very large currents

Dpreventing an open circuit between the voltage source and the load

Correct answer

B. preventing a short circuit between conducting wires

Explanation

The correct answer is preventing a short circuit between conducting wires.