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All Electrical Engineering MCQs

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

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2421Electrical EngineeringMedium

1 angstrom is equal to________?

A10″6 cm

B10″10 m

C10-8 mm

D10~14 m

Correct answer

B. 10″10 m

Explanation

The correct answer is 10″10 m.

2422Electrical EngineeringMedium

The vafcie of transformation ratio of an induction motor can be found by________?

Anone of the above

Bopen-circuit test only

Cshort-circuit test only

Dstator resistance test

Correct answer

C. short-circuit test only

Explanation

The correct answer is short-circuit test only.

2423Electrical EngineeringMedium

Which of the following loss in a D.C. generator is dissipated in the form of heat?

AAll of the above

BCopper loss

CCore loss

DMechanical loss

Correct answer

A. All of the above

Explanation

The correct answer is All of the above.

2424Electrical EngineeringMedium

An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is________?

A0.75

B0.25

D0.5

Correct answer

D. 0.5

Explanation

The correct answer is 0.5.

2425Electrical EngineeringMedium

An ideal voltage source has________?

Aterminal voltage in proportion to load

Bopen circuit voltage equal to the voltage on full load

Cterminal voltage in proportion to current

Dzero internal resistance

Correct answer

D. zero internal resistance

Explanation

The correct answer is zero internal resistance.

2426Electrical EngineeringMedium

An open resistor, when checked with an ohm-meter reads________?

Azero

Bhigh but within tolerance

Clow but not zero

Dinfinite

Correct answer

D. infinite

Explanation

The correct answer is infinite.

2427Electrical EngineeringMedium

An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?

AfT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz

BfT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.

CfT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

DfT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

Correct answer

D. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

Explanation

The correct answer is fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz.

2428Electrical EngineeringMedium

A steam power station requires space________?

Aequal to diesel power station

Bless than diesel power station

Cmore than diesel power station

Correct answer

C. more than diesel power station

Explanation

The correct answer is more than diesel power station.

2429Electrical EngineeringMedium

The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is________?

A1.5Hzs

B1sec

C106sec

D1Hzs

Correct answer

D. 1Hzs

Explanation

The correct answer is 1Hzs.

2430Electrical EngineeringMedium

The only difference between construction of D.C generator and A.C generator is that of________?

Amagnetic field

Bcoil

Ccommutator

Dcarbon brushes

Correct answer

C. commutator

Explanation

The correct answer is commutator.

An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?

AfT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz

BfT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.

CfT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz

DfT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

Correct answer

D. fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

Explanation

The correct answer is fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz.