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All Electrical Engineering MCQs

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

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1861Electrical EngineeringMedium

Riunting in a synchronous motor takes place________?

Amotor is under loaded

Bwhen supply voltage fluctuates

Cwhen power factor is unity

Dwhen load varies

Correct answer

D. when load varies

Explanation

The correct answer is when load varies.

1862Electrical EngineeringMedium

Buchholz’s relay gives warning and protection against________?

Aelectrical fault outside the transformer in outgoing feeder

Bnone of the above

Celectrical fault inside the transformer itself

Dfor both outside and inside faults

Correct answer

C. electrical fault inside the transformer itself

Explanation

The correct answer is electrical fault inside the transformer itself.

1863Electrical EngineeringMedium

A voltage of about 200 V can be measured________?

Aa D.C. potentiometer in conjunction with a volt ratio box

Ba D.C. potentiometer in conjunction with a known resistance

Cnone of the above

Ddirectly by a D.C. potentiometer

Correct answer

A. a D.C. potentiometer in conjunction with a volt ratio box

Explanation

The correct answer is a D.C. potentiometer in conjunction with a volt ratio box.

1864Electrical EngineeringMedium

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

Correct answer

D. 4

Explanation

The correct answer is 4.

1865Electrical EngineeringMedium

Which D.C. motor is preferred for elevators?

ASeries motor

BDifferential compound motor

CShunt motor

DCumulative compound motor

Correct answer

D. Cumulative compound motor

Explanation

The correct answer is Cumulative compound motor.

1866Electrical EngineeringMedium

Natural rubber is obtained from milky sap of tropical trees

ANo

BYes

Correct answer

B. Yes

Explanation

The correct answer is Yes.

1867Electrical EngineeringMedium

In D.C. generators, the brushes on commutator remain in contact with conductors which________?

Alie under south pole

Bare farthest from the poles

Clie under north pole

Dlie under interpolar region

Correct answer

D. lie under interpolar region

Explanation

The correct answer is lie under interpolar region.

1868Electrical EngineeringMedium

If the crystal frequency changes with temperature, we say that crystal has________temperature coefficient?

APositive

BZero

CNone of the above

DNegative

Correct answer

A. Positive

Explanation

The correct answer is Positive.

1869Electrical EngineeringMedium

jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?

A6.6 kV (r.m.s. value)/cm

B22 kV (maximum value)/cm

C30 kV (maximum value)/cm

D11 kV (r.m.s. value)/cm

Correct answer

C. 30 kV (maximum value)/cm

Explanation

The correct answer is 30 kV (maximum value)/cm.

1870Electrical EngineeringMedium

Materials exhibiting zero value of resistivity are known as ________?

Ainsulators

Bconductors

Csuperconductors

Dsemiconductors

Correct answer

C. superconductors

Explanation

The correct answer is superconductors.

Buchholz’s relay gives warning and protection against________?

Aelectrical fault outside the transformer in outgoing feeder

Bnone of the above

Celectrical fault inside the transformer itself

Dfor both outside and inside faults

Correct answer

C. electrical fault inside the transformer itself

Explanation

The correct answer is electrical fault inside the transformer itself.

A voltage of about 200 V can be measured________?

Aa D.C. potentiometer in conjunction with a volt ratio box

Ba D.C. potentiometer in conjunction with a known resistance

Cnone of the above

Ddirectly by a D.C. potentiometer

Correct answer

A. a D.C. potentiometer in conjunction with a volt ratio box

Explanation

The correct answer is a D.C. potentiometer in conjunction with a volt ratio box.