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All Electrical Engineering MCQs

Study 3,658 Electrical Engineering MCQs with correct answers and explanations.

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3191Electrical EngineeringMedium

When both the inductance and resistance of a coil are doubled the value of________?

Ainitial rate of rise of current is doubled

Btime constant remains unchanged

Cfinal steady current is doubled

Dtime constant is halved

Correct answer

B. time constant remains unchanged

Explanation

The correct answer is time constant remains unchanged.

3192Electrical EngineeringMedium

When SCR is OFF, the current in the circuit is ________?

ASmall leakage current

BExactly zero

CNone of the above

DLarge leakage current

Correct answer

A. Small leakage current

Explanation

The correct answer is Small leakage current.

3193Electrical EngineeringMedium

At series resonance, the net reactive component of circuit current is ________?

ANone of the above

BInductive

CZero

DCapacitive

Correct answer

C. Zero

Explanation

The correct answer is Zero.

3194Electrical EngineeringMedium

All the rules and laws of D.C. circuit also apply to A.C. circuit containing________?

Aresistance only

Binductance only

Ccapacitance only

Dall above

Correct answer

A. resistance only

Explanation

The correct answer is resistance only.

3195Electrical EngineeringMedium

For a purely inductive circuit which of the following is true?

AApparent power is zero

BAny capacitance even if present in the circuit will not be charged

CActual power of the circuit is zero

DRelative power is.zero

Correct answer

C. Actual power of the circuit is zero

Explanation

The correct answer is Actual power of the circuit is zero.

3196Electrical EngineeringMedium

Rise time is defined by the interval when________?

Aboth B and C

Banode current rises 10 % to 90 % of its final value

Cgate current rises from 90 % to 100 % of it final value

Danode voltage drops from 90 % to 10 % of its initial value

Correct answer

A. both B and C

Explanation

The correct answer is both B and C.

3197Electrical EngineeringMedium

Which of the following are the passive elements?

ABoth

BResistor

CNone of these.

DBulb

Correct answer

A. Both

Explanation

When the element is not capable of delivering energy independently, are called as passive element. Both resistor and bulb are the passive elements and they can’t increase the energy level of a circuit

3198Electrical EngineeringMedium

The first goal to accomplish in analyzing a complex series-parallel circuit is to________?

Asolve for all the voltage drops

Bequate all series components

Cequate all parallel components

Dsolve for the total current and resistance

Correct answer

D. solve for the total current and resistance

Explanation

The correct answer is solve for the total current and resistance.

3199Electrical EngineeringMedium

A load curve indicates________?

Aaverage power used during the period

Beither of the above

Cnone of the above

Daverage kWh (kW) energy consumption during the period

Correct answer

D. average kWh (kW) energy consumption during the period

Explanation

The correct answer is average kWh (kW) energy consumption during the period.

3200Electrical EngineeringMedium

The pointer of an indicating instrument should be________?

Aeither A. or B.

Bvery heavy

Cneither A. nor B.

Dvery light

Correct answer

D. very light

Explanation

The correct answer is very light.

3191Electrical EngineeringMedium

When both the inductance and resistance of a coil are doubled the value of________?

Ainitial rate of rise of current is doubled

Btime constant remains unchanged

Cfinal steady current is doubled

Dtime constant is halved

Correct answer

B. time constant remains unchanged

Explanation

The correct answer is time constant remains unchanged.

3192Electrical EngineeringMedium

When SCR is OFF, the current in the circuit is ________?

ASmall leakage current

BExactly zero

CNone of the above

DLarge leakage current

Correct answer

A. Small leakage current

Explanation

The correct answer is Small leakage current.

3193Electrical EngineeringMedium

At series resonance, the net reactive component of circuit current is ________?

ANone of the above

BInductive

CZero

DCapacitive

Correct answer

C. Zero

Explanation

The correct answer is Zero.

3194Electrical EngineeringMedium

All the rules and laws of D.C. circuit also apply to A.C. circuit containing________?

Aresistance only

Binductance only

Ccapacitance only

Dall above

Correct answer

A. resistance only

Explanation

The correct answer is resistance only.

3195Electrical EngineeringMedium

For a purely inductive circuit which of the following is true?

AApparent power is zero

BAny capacitance even if present in the circuit will not be charged

CActual power of the circuit is zero

DRelative power is.zero

Correct answer

C. Actual power of the circuit is zero

Explanation

The correct answer is Actual power of the circuit is zero.

3196Electrical EngineeringMedium

Rise time is defined by the interval when________?

Aboth B and C

Banode current rises 10 % to 90 % of its final value

Cgate current rises from 90 % to 100 % of it final value

Danode voltage drops from 90 % to 10 % of its initial value

Correct answer

A. both B and C

Explanation

The correct answer is both B and C.

3197Electrical EngineeringMedium

Which of the following are the passive elements?

ABoth

BResistor

CNone of these.

DBulb

Correct answer

A. Both

Explanation

3198Electrical EngineeringMedium

The first goal to accomplish in analyzing a complex series-parallel circuit is to________?

Asolve for all the voltage drops

Bequate all series components

Cequate all parallel components

Dsolve for the total current and resistance

Correct answer

D. solve for the total current and resistance

Explanation

The correct answer is solve for the total current and resistance.

3199Electrical EngineeringMedium

A load curve indicates________?

Aaverage power used during the period

Beither of the above

Cnone of the above

Daverage kWh (kW) energy consumption during the period

Correct answer

D. average kWh (kW) energy consumption during the period

Explanation

The correct answer is average kWh (kW) energy consumption during the period.

3200Electrical EngineeringMedium

The pointer of an indicating instrument should be________?

Aeither A. or B.

Bvery heavy

Cneither A. nor B.

Dvery light

Correct answer

D. very light

Explanation

The correct answer is very light.