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Basic Electrical MCQs

Study 121 Electrical Engineering MCQs with correct answers and explanations.

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111Electrical EngineeringMedium

The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is________?

Apositive

Babout 2 ohms per degree

Czero

Dnegative

Correct answer

A. positive

Explanation

The correct answer is positive.

112Electrical EngineeringMedium

If the efficiency of a machine is to be high, what should be low ________?

ARatio of output to input

BTrue component of power

CInput power

DLosses

EkWh consumed

Correct answer

D. Losses

Explanation

The correct answer is Losses.

113Electrical EngineeringMedium

If a parallel circuit is opened in the main line, the current________?

Aincreases in the branch of the lowest resistance

Bis zero in the highest resistive branch

Cincreases in each branch

Dis zero in all branches

Correct answer

D. is zero in all branches

Explanation

The correct answer is is zero in all branches.

114Electrical EngineeringMedium

Electric pressure is also called________?

Avoltage

Benergy

Cresistance

Dpower

Correct answer

A. voltage

Explanation

The correct answer is voltage.

115Electrical EngineeringMedium

Capacitor does not allow the sudden change of?

Avoltage

Bpower

Ccurrent

DNone of the above

Correct answer

A. voltage

Explanation

The expression of current through a capacitor is For sudden change of voltage infinite current is required. But practically it is not possible. Practical capacitor circuit has finite value of time constant

116Electrical EngineeringMedium

Which of the following statement is true both for a series and a parallel D. C. circuit?

AElements have individual currents

BVoltages are additive

CPower are additive

DCurrents are additive

Correct answer

C. Power are additive

Explanation

The correct answer is Power are additive.

117Electrical EngineeringMedium

The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around________?

A1.8 x 10″8 Q-m

B1.4 x 10~8 Q-m

C1.2 x 10~8 Q-m

D1.6 x 10″”8 Q-m

Correct answer

D. 1.6 x 10″”8 Q-m

Explanation

The correct answer is 1.6 x 10″”8 Q-m.

118Electrical EngineeringMedium

An electric filament bulb can be worked from________?

ABattery supply only

BAll above

CA. C. supply only

DD. C. supply only

Correct answer

B. All above

Explanation

The correct answer is All above.

119Electrical EngineeringMedium

International ohm is defined in terms of the resistance of________?

Aa cube of copper

Ba column of mercury

Ca cube of carbon

Dthe unit length of wire

Correct answer

B. a column of mercury

Explanation

The correct answer is a column of mercury.

120Electrical EngineeringMedium

A substance whose molecules consist of dissimilar atoms is called________?

Asuper-conducto

Binsulator

Csemi-conductor

Dcompound

Correct answer

D. compound

Explanation

The correct answer is compound.

111Electrical EngineeringMedium

The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is________?

Apositive

Babout 2 ohms per degree

Czero

Dnegative

Correct answer

A. positive

Explanation

The correct answer is positive.

112Electrical EngineeringMedium

If the efficiency of a machine is to be high, what should be low ________?

ARatio of output to input

BTrue component of power

CInput power

DLosses

EkWh consumed

Correct answer

D. Losses

Explanation

The correct answer is Losses.

113Electrical EngineeringMedium

If a parallel circuit is opened in the main line, the current________?

Aincreases in the branch of the lowest resistance

Bis zero in the highest resistive branch

Cincreases in each branch

Dis zero in all branches

Correct answer

D. is zero in all branches

Explanation

The correct answer is is zero in all branches.

114Electrical EngineeringMedium

Electric pressure is also called________?

Avoltage

Benergy

Cresistance

Dpower

Correct answer

A. voltage

Explanation

The correct answer is voltage.

115Electrical EngineeringMedium

Asuper-conducto

Binsulator

Csemi-conductor

Dcompound

Correct answer

D. compound

Explanation

The correct answer is compound.