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Power Electronics

Study 217 Electrical Engineering MCQs with correct answers and explanations.

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211Electrical EngineeringMedium

DIAC are specifically designed to trigger________?

ASCR

BGTO

CTRIAC

DOnly (a) and (b)

Correct answer

D. Only (a) and (b)

Explanation

The correct answer is Only (a) and (b).

212Electrical EngineeringMedium

An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be________?

A6000 A.

B2121.32 A.

C1500 A.

D4242.64 A.

Correct answer

B. 2121.32 A.

Explanation

The correct answer is 2121.32 A..

213Electrical EngineeringMedium

A modern power semiconductor device that combines the characteristic of BJT and MOSFET is________?

AMCT

BFCT

CIGBT

DGTO

Correct answer

C. IGBT

Explanation

The correct answer is IGBT.

214Electrical EngineeringMedium

Advantages of HVDC transmission over AC system is / are________?

AAll of these

BThey can link two AC system operating unsynchronized

CVery good dynamic behavior

DReversal of power can be controlled by firing angle

Correct answer

A. All of these

Explanation

The correct answer is All of these.

215Electrical EngineeringMedium

Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of________?

ADC output power to the transformer volt – amp rating required by primary

BDC output power to the transformer volt – amp rating required by secondary

CAC input power to the transformer volt – amp rating required by primary

DAC input power to the transformer volt – amp rating required by secondary

Correct answer

B. DC output power to the transformer volt – amp rating required by secondary

Explanation

The correct answer is DC output power to the transformer volt – amp rating required by secondary.

216Electrical EngineeringMedium

Under over voltage condition impedance offered by the voltage clamping device is________?

AHigh

Binfinity

Cmoderate

Dlow

Correct answer

D. low

Explanation

The correct answer is low.

217Electrical EngineeringMedium

In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes________?

AResult in net current flow component into the base

BOnly (b) and (c)

CDo not contribute to the collector current

DOnly (a) and (b)

EContribute to the collector current

Correct answer

D. Only (a) and (b)

Explanation

The correct answer is Only (a) and (b).

Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of________?

ADC output power to the transformer volt – amp rating required by primary

BDC output power to the transformer volt – amp rating required by secondary

CAC input power to the transformer volt – amp rating required by primary

DAC input power to the transformer volt – amp rating required by secondary

Correct answer

B. DC output power to the transformer volt – amp rating required by secondary

Explanation

The correct answer is DC output power to the transformer volt – amp rating required by secondary.