# Power Electronics MCQ

Power electronics refers to the study of electronic switching for controlling the flow of electric power.

## A cycloconverter converts

A cycloconverter converts:

1. AC to DC
2. DC to AC
3. DC to DC with different level
4. AC to AC at different frequencies

Correct answer: 4. AC to AC at different frequencies

## The power diode is a

The power diode is a:

1. One terminal device
2. Two terminal device
3. Three terminal device
4. Four terminal device

Correct answer: 2. Two terminal device

## Snubber circuits are employed to

Snubber circuits are employed to:

1. Reduce the switching power losses
2. Control the device dv/dt
3. Avoid breakdowns
4. All of these

Correct answer: 4. All of these

## The Number of PN junctions on thyristor

The Number of PN junctions on thyristor:

1. Two
2. Three
3. Four
4. Five

## An Inverter converts

An inverter converts:

1. AC to DC
2. DC to AC
3. DC to DC with different level
4. AC to AC at different frequencies

Correct answer: 2. DC to AC

## A step-up chopper operates at a duty cycle of 50%. Calculate the output voltage if Vs = 230 V

A step-up chopper operates at a duty cycle of 50%. Calculate the average output voltage of chopper if Vs = 230 V:

1. 230 V
2. 460 V
3. 920 V
4. 1840 V

Solution: Formula: V(o) = 230/(1-0.5)

## MCT is current or voltage controlled device

MCT is a __________ controlled device:

1. Voltage
2. Current

## Layer and Junction number on DIAC

The DIAC is a ________ layer, ________ junction device:

1. Two, Three
2. Two, Four
3. Five, Three
4. Five, Four

## During the normal operation of an SCR, the anode with respect to cathode is

During the normal operation of an SCR, the anode is ___________ w.r.t. cathode

1. Negative
2. Positive
3. None of the above