Power electronics refers to the study of electronic switching for controlling the flow of electric power.
A cycloconverter converts
A cycloconverter converts:
- AC to DC
- DC to AC
- DC to DC with different level
- 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:
- One terminal device
- Two terminal device
- Three terminal device
- Four terminal device
Correct answer: 2. Two terminal device
Snubber circuits are employed to
Snubber circuits are employed to:
- Reduce the switching power losses
- Control the device dv/dt
- Avoid breakdowns
- All of these
Correct answer: 4. All of these
The Number of PN junctions on thyristor
The Number of PN junctions on thyristor:
- Two
- Three
- Four
- Five
Correct answer: 2. Three
An Inverter converts
An inverter converts:
- AC to DC
- DC to AC
- DC to DC with different level
- 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:
- 230 V
- 460 V
- 920 V
- 1840 V
Correct answer: 2. 460 V
Solution: Formula: V(o) = 230/(1-0.5)
MCT is current or voltage controlled device
MCT is a __________ controlled device:
- Voltage
- Current
Correct answer: 1. Voltage
Layer and Junction number on DIAC
The DIAC is a ________ layer, ________ junction device:
- Two, Three
- Two, Four
- Five, Three
- Five, Four
Correct answer: 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
- Negative
- Positive
- None of the above
Correct answer: 2. Positive
Which of the following is not an advantage of using RC full wave Triggering Circuit with SCR
Which of the following is not an advantage of using RC full-wave Triggering Circuit with SCR:
- Range of firing angle (α) is from 0° to 180°
- It produces firing pulses during both cycles of supply
- Power dissipation in the gate circuit is more
- None of above
Correct answer: 3. Power dissipation in the gate circuit is more
Since the RC-triggering circuit produces prolonged pulses, so the power dissipation in the gate circuit is more