Power Electronics
Previous year question paper with solutions for Power Electronics
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- An SCR is a __________ terminals and __________ junctions device.
- A TRIAC is normally turned ON by___________.
- The number of PN junctions in a UJT are___________.
- A DIAC is used to __________ TRIAC.
- When large quantity of ac power is required to be converted into dc________ are used.
- The value of firing angle cannot be more than___________.
- Natural commutation is only possible in case of________ circuits.
- The average output voltage of a chopper circuit is determined by__________ durations.
- To obtain smooth speed control of ac motors,_________control devices are employed.
- In a UPS, the source of power is__________.
- A DIAC is used to __________ TRIAC.
- In the continuous conduction mode, at least ________ thyristors conduct at all times.
- A chopper converts ___________.
- A main advantage of a bridge inverter is that it does not use any __________.
- Dc motors provide _________ starting torque.
- The speed of the motor increases with the increase in __________.
- SMPS stands for __________
- The power carrying capability reduces with _________ in distance.
- A UJT is a _________ device.
- Three types of UPS are __________, __________ and __________ .