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All Electrical Engineering MCQs

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

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1181Electrical EngineeringMedium

In a p-n junction diode under reverse bias, the magnitude of electric field is maximum at________?

Athe edge of the depletion region on the p-side

Bthe p-n junction

Cthe center of the depletion region on the n-side

Dthe edge of the depletion region on the n-side

Correct answer

B. the p-n junction

Explanation

The correct answer is the p-n junction.

1182Electrical EngineeringMedium

For maximum transfer of power, internal resistance of the source should be________?

Aless than the load resistance

Bgreater than the load resistance

Cnone of the above

Dequal to load resistance

Correct answer

D. equal to load resistance

Explanation

The correct answer is equal to load resistance.

1183Electrical EngineeringMedium

When an a.c. signal is applied to an amplifier,,the operating point moves along________?

Aboth d.c. and a.c. load lines

Bnone of the above

Cc. load line

Correct answer

C. c. load line

Explanation

The correct answer is c. load line.

1184Electrical EngineeringMedium

In D.C. shunt motors as load is reduced________?

Athe speed will increase in proportion to reduction in load

Bthe speed will reduce

Cthe speed will increase abruptly

Dthe speed will remain almost/constant

Correct answer

D. the speed will remain almost/constant

Explanation

The correct answer is the speed will remain almost/constant.

1185Electrical EngineeringMedium

Which D.C. motor will be preferred for machine tools?

ACumulative compound motor

BShunt motor

CSeries motor

DDifferential compound motor

Correct answer

B. Shunt motor

Explanation

The correct answer is Shunt motor.

1186Electrical EngineeringMedium

A universal motor is one which________?

Acan be operated either on D.C. or A.C. supply at approximately the same speed and output

Bruns at dangerously high speed on no-load

Ccan be marketed internationally

Correct answer

A. can be operated either on D.C. or A.C. supply at approximately the same speed and output

Explanation

The correct answer is can be operated either on D.C. or A.C. supply at approximately the same speed and output.

1187Electrical EngineeringMedium

Which of the following types of motor enclosure is safest?

ATotally enclosed

BSemi closed

COpen type

DTotally enclosed fan cooled

Correct answer

D. Totally enclosed fan cooled

Explanation

The correct answer is Totally enclosed fan cooled.

1188Electrical EngineeringMedium

The value of flux involved m the e.m.f. equation of a transformer is________?

Amaximum value

Br.m.s. value

Caverage value

Dinstantaneous value

Correct answer

A. maximum value

Explanation

The correct answer is maximum value.

1189Electrical EngineeringMedium

The parallel combination of a 470 Ω resistor and a 1.2 kΩ resistor is in series with the parallel combination of three 3 kΩ resistors. A 200 V source is connected across the circuit. The resistor with the most current has a value of________?

A1.2 kΩ

B470 Ω

C470 Ω or 1.2 kΩ

D3 kΩ

Correct answer

B. 470 Ω

Explanation

The correct answer is 470 Ω.

1190Electrical EngineeringMedium

The maximum efficiency of transformer coupled class A power amplifier is ________?

A45%

B30%

C50%

D80%

Correct answer

C. 50%

Explanation

The correct answer is 50%.

A universal motor is one which________?

Acan be operated either on D.C. or A.C. supply at approximately the same speed and output

Bruns at dangerously high speed on no-load

Ccan be marketed internationally

Correct answer

A. can be operated either on D.C. or A.C. supply at approximately the same speed and output

Explanation

The correct answer is can be operated either on D.C. or A.C. supply at approximately the same speed and output.