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Power Electronics

Study 217 Electrical Engineering MCQs with correct answers and explanations.

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51Electrical EngineeringMedium

A crowbar is a circuit which is used to protect a________?

Avoltage sensitive load from excessive dc power supply output voltages

Bvoltage sensitive load from excessive ac power supply output voltages

Ccurrent sensitive load from excessive dc power supply output voltages

Dcurrent sensitive load from excessive ac power supply output voltages

Correct answer

A. voltage sensitive load from excessive dc power supply output voltages

Explanation

The correct answer is voltage sensitive load from excessive dc power supply output voltages.

52Electrical EngineeringMedium

Regulator sampling PWM is usually used in________?

ALow power inverters

BOnly A. and B.

CHigh power inverters

DRectifiers

Correct answer

B. Only A. and B.

Explanation

The correct answer is Only A. and B..

53Electrical EngineeringMedium

What happen due to high di / dt________?

ANone of these

BInsulation failure

CLocal hot spot

DBreakdown of junction

Correct answer

C. Local hot spot

Explanation

The correct answer is Local hot spot.

54Electrical EngineeringMedium

Ripple factor is the ratio of________?

ARms value of the ac component of load voltage to the dc voltage

BPeak value of the dc component of load voltage to the ac voltage

CAverage value of the ac component of load voltage to the peak value of voltage

DAverage value of the dc component of load voltage to the ac voltage

Correct answer

A. Rms value of the ac component of load voltage to the dc voltage

Explanation

The correct answer is Rms value of the ac component of load voltage to the dc voltage.

55Electrical EngineeringMedium

A Triac is a ________?

A3 terminal bilateral switch

B2 terminal switch

C2 terminal bilateral switch

D3 terminal bidirectional switch

Correct answer

D. 3 terminal bidirectional switch

Explanation

The correct answer is 3 terminal bidirectional switch.

56Electrical EngineeringMedium

The maximum di/dt in a SCR is________?

ADirectly proportional to inductance in the circuit

BInversely proportional to supply voltage

CDirectly proportional to supply voltage

DBoth A and B

Correct answer

D. Both A and B

Explanation

The correct answer is Both A and B.

57Electrical EngineeringMedium

SITH is also known as________?

AFilled controlled diode

BNone of these

CFilled controlled rectifier

DSilicon controlled rectifier

Correct answer

A. Filled controlled diode

Explanation

The correct answer is Filled controlled diode.

58Electrical EngineeringMedium

Anode of an operational SCR is ________?

AAlways negative w.r.t cathode

BAlways positive w.r.t anode

CAlways positive w.r.t cathode

DAlways negative w.r.t anode

Correct answer

C. Always positive w.r.t cathode

Explanation

The correct answer is Always positive w.r.t cathode.

59Electrical EngineeringMedium

IGBT stands for________?

AInductive gate bidirectional transistor

BInsulated gate bidirectional transistor

CInsulated gate bipolar transistor

DInductive gate bipolar transistor

Correct answer

C. Insulated gate bipolar transistor

Explanation

The correct answer is Insulated gate bipolar transistor.

60Electrical EngineeringMedium

After proper turn on of thyristor________?

Agate signal should present but can be removed

Bgate signal must be removed

Cnone of the above.

Dgate signal is always present

Correct answer

B. gate signal must be removed

Explanation

The correct answer is gate signal must be removed.

A crowbar is a circuit which is used to protect a________?

Avoltage sensitive load from excessive dc power supply output voltages

Bvoltage sensitive load from excessive ac power supply output voltages

Ccurrent sensitive load from excessive dc power supply output voltages

Dcurrent sensitive load from excessive ac power supply output voltages

Correct answer

A. voltage sensitive load from excessive dc power supply output voltages

Explanation

The correct answer is voltage sensitive load from excessive dc power supply output voltages.

Ripple factor is the ratio of________?

ARms value of the ac component of load voltage to the dc voltage

BPeak value of the dc component of load voltage to the ac voltage

CAverage value of the ac component of load voltage to the peak value of voltage

DAverage value of the dc component of load voltage to the ac voltage

Correct answer

A. Rms value of the ac component of load voltage to the dc voltage

Explanation

The correct answer is Rms value of the ac component of load voltage to the dc voltage.