Study mode · no timer

All Electrical Engineering MCQs

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

Answers and explanations are always visible Take this quiz

2191Electrical EngineeringMedium

In the breakdown region, a zener didoe behaves like a ________source?

Aconstant resistance

Bconstant voltage

Cnone of the above

Dconstant current

Correct answer

B. constant voltage

Explanation

The correct answer is constant voltage.

2192Electrical EngineeringMedium

Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250,are cascaded.The open circuit voltage gain of combined amplifier is________?

A49dB

B98dB

C102dB

D51dB

Correct answer

B. 98dB

Explanation

The correct answer is 98dB.

2193Electrical EngineeringMedium

In repulsion motor, maximum torque is developed when________?

Abrush axis is at 45° electrical to the field axis

Bbrush axis is at 90° electrical to the field axis

Cbrush axis coincides with the field axis

Dnone of the above

Correct answer

A. brush axis is at 45° electrical to the field axis

Explanation

The correct answer is brush axis is at 45° electrical to the field axis.

2194Electrical EngineeringMedium

In induction motor, percentage slip depends on________?

Asupply voltage

Bcopper losses in motor

Csupply frequency

Dnone of the above

Correct answer

B. copper losses in motor

Explanation

The correct answer is copper losses in motor.

2195Electrical EngineeringMedium

Tuned class C amplifiers are used for RF signals of________?

ANone of the above

BLow power

CVery high power

DHigh power

Correct answer

A. None of the above

Explanation

The correct answer is None of the above.

2196Electrical EngineeringMedium

Which of the following material has nearly zero temperature co-efficient of resistance________?

APorcelain

BCarbon

CManganin

DCopper

Correct answer

C. Manganin

Explanation

The correct answer is Manganin.

2197Electrical EngineeringMedium

The voltage control in electric supply networks in required on account of which of the following reasons?

AAdjustment of voltage at consumers premises within statutory limits

BAdjustment of short period daily and seasonal voltage variations in accordance with variations of load

CAll of the above

DControl of active and reactive power

Correct answer

C. All of the above

Explanation

The correct answer is All of the above.

2198Electrical EngineeringMedium

In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.

Aany of the above

Baccelerates

Cnone of the above

Ddecelerates

Correct answer

B. accelerates

Explanation

The correct answer is accelerates.

2199Electrical EngineeringMedium

At low value of power factor, the cost of generation of a power station will be________?

Ahigh

Bremain same

Cnone of the above

Dlow

Correct answer

A. high

Explanation

The correct answer is high.

2200Electrical EngineeringMedium

In a radio receiver, noise is generally developed at ________?

AReceiving antenna

BAudio stage

CRF stage

DIF stage

Correct answer

C. RF stage

Explanation

The correct answer is RF stage.

In repulsion motor, maximum torque is developed when________?

Abrush axis is at 45° electrical to the field axis

Bbrush axis is at 90° electrical to the field axis

Cbrush axis coincides with the field axis

Dnone of the above

Correct answer

A. brush axis is at 45° electrical to the field axis

Explanation

The correct answer is brush axis is at 45° electrical to the field axis.

The voltage control in electric supply networks in required on account of which of the following reasons?

AAdjustment of voltage at consumers premises within statutory limits

BAdjustment of short period daily and seasonal voltage variations in accordance with variations of load

CAll of the above

DControl of active and reactive power

Correct answer

C. All of the above

Explanation

The correct answer is All of the above.