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All Electrical Engineering MCQs

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

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1211Electrical EngineeringMedium

Two waves of the same frequency have opposite phase when the phase angle between them is________?

A360°

B90°

C0°

D180°

Correct answer

D. 180°

Explanation

The correct answer is 180°.

1212Electrical EngineeringMedium

Copper brushes in D.C. machine are used________?

Ain none of the above cases

Bwhere low voltage and high currents are involved

Cwhere high voltage and small cur-rents are involved

Din both of the above cases

Correct answer

B. where low voltage and high currents are involved

Explanation

The correct answer is where low voltage and high currents are involved.

1213Electrical EngineeringMedium

The input impedance of a transistor is________?

Avery high

Bhigh

Clow

Dalmost zero

Correct answer

C. low

Explanation

The correct answer is low.

1214Electrical EngineeringMedium

Battery operated trucks are used in________?

Anarrow gauge traction

Bsteel mills

Cfactories for material transportation

Dpower stations

Correct answer

C. factories for material transportation

Explanation

The correct answer is factories for material transportation.

1215Electrical EngineeringMedium

As the junction temperature increases, the voltage breakdown point for avalanche mechanism________?

ANone of the above

BDecrease

CIncreases

DRemains the same

Correct answer

C. Increases

Explanation

The correct answer is Increases.

1216Electrical EngineeringMedium

In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are________?

AThree

Btwo

CFour

DOne

Correct answer

B. two

Explanation

The correct answer is two.

1217Electrical EngineeringMedium

The absolute permittivity of free space is given by________?

A8.854 x KT11 F/m

B8.854 x 1(T10 F/m)

C8.854 x 10″12 F/m

D8.854 x 1(T9 F/m)

Correct answer

B. 8.854 x 1(T10 F/m)

Explanation

The correct answer is 8.854 x 1(T10 F/m).

1218Electrical EngineeringMedium

In a substation the following equipment is not installed?

Aseries capacitors

Bshunt reactors

Cvoltatre transformers

Dexciters

Correct answer

D. exciters

Explanation

The correct answer is exciters.

1219Electrical EngineeringMedium

Electric displacement is a________quantity

Aboth of the above

Bvector

Cnone of the above

Dscalar

Correct answer

B. vector

Explanation

The correct answer is vector.

1220Electrical EngineeringMedium

A balanced 3-phase system consists of________?

Anegative and zero sequence currents

Bzero sequence currents only

Czero, negative and positive sequence currents

Dpositive sequence currents only

Correct answer

D. positive sequence currents only

Explanation

The correct answer is positive sequence currents only.

Copper brushes in D.C. machine are used________?

Ain none of the above cases

Bwhere low voltage and high currents are involved

Cwhere high voltage and small cur-rents are involved

Din both of the above cases

Correct answer

B. where low voltage and high currents are involved

Explanation

The correct answer is where low voltage and high currents are involved.