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All Electrical Engineering MCQs

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

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3071Electrical EngineeringMedium

As load on an induction motor goes on increasing________?

Aits power factor goes on increasing even after full load

Bits power factor goes on decreasing

Cits power factor goes on increasing up to full load and then it falls again

Dits power factor remains constant

Correct answer

C. its power factor goes on increasing up to full load and then it falls again

Explanation

The correct answer is its power factor goes on increasing up to full load and then it falls again.

3072Electrical EngineeringMedium

A voltage divider consists of two 68 kΩ resistors and a 24 V source. The unknown output voltage is________?

A0 V

B24 V

C12 V

D6 V

Correct answer

C. 12 V

Explanation

The correct answer is 12 V.

3073Electrical EngineeringMedium

The output voltage of a charger is________?

Aless than the battery voltage

Bnone of the above

Chigher than the battery voltage

Dthe same as the battery voltage

Correct answer

C. higher than the battery voltage

Explanation

The correct answer is higher than the battery voltage.

3074Electrical EngineeringMedium

There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is________?

A490 mA

B800 mA

C0 A

D310 mA

Correct answer

A. 490 mA

Explanation

The correct answer is 490 mA.

3075Electrical EngineeringMedium

In CE arrangement, the value of input impedance is approximately equal to ________?

ANone of the above

BHre

CHoe

DHie

Correct answer

D. Hie

Explanation

The correct answer is Hie.

3076Electrical EngineeringMedium

In lap winding, the number of brushes is always________?

Atwo

Bhalf the number of poles

Csame as the number of poles

Ddouble the number of poles

Correct answer

C. same as the number of poles

Explanation

The correct answer is same as the number of poles.

3077Electrical EngineeringMedium

Pressure cables are generally not used beyond________?

A66 kV

B132 kV

C11 kV

D33 kV

Correct answer

A. 66 kV

Explanation

The correct answer is 66 kV.

3078Electrical EngineeringMedium

The operation of a D.C. machine with large air gap lengths is comparatively________?

Anoisy

Beither of the above

Cnone of the above

Dquiet

Correct answer

D. quiet

Explanation

The correct answer is quiet.

3079Electrical EngineeringMedium

The household energy meter is________?

Aan indicating instrument

Ban integrating instrument

Ca recording instrument

Dnone of the above

Correct answer

B. an integrating instrument

Explanation

The correct answer is an integrating instrument.

3080Electrical EngineeringMedium

The number of stages that can be directly coupled is limited because________?

ANone of the above

BChanges in temperature cause thermal instability

CCircuit becomes heavy and costly

DIt becomes difficult to bias the circuit

Correct answer

B. Changes in temperature cause thermal instability

Explanation

The correct answer is Changes in temperature cause thermal instability.

As load on an induction motor goes on increasing________?

Aits power factor goes on increasing even after full load

Bits power factor goes on decreasing

Cits power factor goes on increasing up to full load and then it falls again

Dits power factor remains constant

Correct answer

C. its power factor goes on increasing up to full load and then it falls again

Explanation

The correct answer is its power factor goes on increasing up to full load and then it falls again.