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Power Electronics

Study 217 Electrical Engineering MCQs with correct answers and explanations.

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61Electrical EngineeringMedium

The opposite of susceptibility is________?

AInterference

BImmunity

CElectromagnetic compatibility

DEmission

Correct answer

B. Immunity

Explanation

The correct answer is Immunity.

62Electrical EngineeringMedium

With gate open, the maximum anode current at which SCR is turned off from ON condition is called________?

Alatching current

Bholding current

Cpeak reverse voltage

Dbreakdown voltage

Correct answer

B. holding current

Explanation

The correct answer is holding current.

63Electrical EngineeringMedium

In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output

AZero

BSwitches between 0 and + 1

CSwitches between – 1 / 2 and + 1 / 2

DSwitches between – 1 and + 1

Correct answer

C. Switches between – 1 / 2 and + 1 / 2

Explanation

The correct answer is Switches between – 1 / 2 and + 1 / 2.

64Electrical EngineeringMedium

Under normal operating condition voltage clamping device offers impedance of________?

Alow value.

Bzero value.

Cmoderate value.

Dhigh value.

Correct answer

D. high value.

Explanation

The correct answer is high value..

65Electrical EngineeringMedium

In current commutated DC-DC choppers, the voltage spike appears across the load when________?

AThe capacitance voltage adds to the supply voltage

BBoth A. and B.

CVoltage across the commutating inductances collapses

DNone of these

Correct answer

B. Both A. and B.

Explanation

The correct answer is Both A. and B..

66Electrical EngineeringMedium

The most suited gate pulses given to the AC regulator with R – L load can be in the form of________?

ALarge isolating pulse transformer

BA train of pulses

CNone of these

DContinuous signal

Correct answer

B. A train of pulses

Explanation

The correct answer is A train of pulses.

67Electrical EngineeringMedium

Double edge modulation eliminates certain harmonics when the reference is a________?

ASine wave

BSquare wave

CTrapezoidal wave

DTriangular wave

Correct answer

A. Sine wave

Explanation

The correct answer is Sine wave.

68Electrical EngineeringMedium

The maximum firing angle in the half wave controlled regulator is________?

A180 degree

B210 degree

C190 degree

D200 degree

Correct answer

B. 210 degree

Explanation

The correct answer is 210 degree.

69Electrical EngineeringMedium

Thyristor can be protected from over voltages by using________?

Asnubber circuit.

Bvoltage clamping device.

Cheat sink.

Dfuse.

Correct answer

B. voltage clamping device.

Explanation

The correct answer is voltage clamping device..

70Electrical EngineeringMedium

In a three phase converter, the number of notches per cycle is________?

ASix

BOne

CNine

DThree

Correct answer

A. Six

Explanation

The correct answer is Six.

61Electrical EngineeringMedium

The opposite of susceptibility is________?

AInterference

BImmunity

CElectromagnetic compatibility

DEmission

Correct answer

B. Immunity

Explanation

The correct answer is Immunity.

62Electrical EngineeringMedium

With gate open, the maximum anode current at which SCR is turned off from ON condition is called________?

Alatching current

Bholding current

Cpeak reverse voltage

Dbreakdown voltage

Correct answer

B. holding current

Explanation

The correct answer is holding current.

63Electrical EngineeringMedium

In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output

AZero

BSwitches between 0 and + 1

CSwitches between – 1 / 2 and + 1 / 2

DSwitches between – 1 and + 1

Correct answer

C. Switches between – 1 / 2 and + 1 / 2

Explanation

The correct answer is Switches between – 1 / 2 and + 1 / 2.

64Electrical EngineeringMedium

Under normal operating condition voltage clamping device offers impedance of________?

Alow value.

Bzero value.

Cmoderate value.

Dhigh value.

Correct answer

D. high value.

Explanation

The correct answer is high value..

65Electrical EngineeringMedium

In current commutated DC-DC choppers, the voltage spike appears across the load when________?

AThe capacitance voltage adds to the supply voltage

BBoth A. and B.

CVoltage across the commutating inductances collapses

DNone of these

Correct answer

B. Both A. and B.

Explanation

The correct answer is Both A. and B..

66Electrical EngineeringMedium

The most suited gate pulses given to the AC regulator with R – L load can be in the form of________?

ALarge isolating pulse transformer

BA train of pulses

CNone of these

DContinuous signal

Correct answer

B. A train of pulses

Explanation

The correct answer is A train of pulses.

67Electrical EngineeringMedium

Double edge modulation eliminates certain harmonics when the reference is a________?

ASine wave

BSquare wave

CTrapezoidal wave

DTriangular wave

Correct answer

A. Sine wave

Explanation

The correct answer is Sine wave.

68Electrical EngineeringMedium

The maximum firing angle in the half wave controlled regulator is________?

A180 degree

B210 degree

C190 degree

D200 degree

Correct answer

B. 210 degree

Explanation

The correct answer is 210 degree.

69Electrical EngineeringMedium

Thyristor can be protected from over voltages by using________?

Asnubber circuit.

Bvoltage clamping device.

Cheat sink.

Dfuse.

Correct answer

B. voltage clamping device.

Explanation

The correct answer is voltage clamping device..

70Electrical EngineeringMedium

In a three phase converter, the number of notches per cycle is________?

ASix

BOne

CNine

DThree

Correct answer

A. Six

Explanation

The correct answer is Six.