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MCQ on Power electronics – 1

May 25, 2017 by admin

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 1. Chopper is also known as
(A) AC transfromer.
(B) DC transformer.
(C) voltage changer.
(D) voltage reducer.

Answer ⇓

           B 

 2. A thyristor can be termed as
(A) AC switch.
(B) DC switch.
(C) both AC and DC switch.
(D) square wave switch.

Answer ⇓

           B 

 3. Which of the following semiconductor power device is not a current triggered device
(A) SCR.
(B) GTO.
(C) TRIAC.
(D) MOSFET.

Answer ⇓

           D 

 4. IGBT is a modern power semiconductor device, that combine the characteristics of
(A) BJT and SCR.
(B) SCR and MOSFET.
(C) MOSFET and BJT.
(D) GTO and Thyristor.

Answer ⇓

           C 

 5. Which of the following power electronic device can be used for high frequency switching application?
(A) BJT.
(B) Power MOSFET.
(C) Schottky diode.
(D) Microwave transistor.

Answer ⇓

           B 

 6. In a 3 phase fully controlled converter the firing frequency is
(A) 3 times the line frequency.
(B) 6 times the line frequency.
(C) 9 times the line frequency.
(D) 12 times the line frequency.

Answer ⇓

           B 

 7. Thyristor can be protected from over voltages by using
(A) voltage clamping device.
(B) fuse.
(C) heat sink.
(D) snubber circuit.

Answer ⇓

           A 

 8. Turn on and turn off times of transistor depends on
(A) applied voltage.
(B) current gain.
(C) junction capacitance.
(D) applied frequency.

Answer ⇓

           C 

 9. A thyristor controlled reactor is used to get
(A) variable resistance.
(B) variable capacitance.
(C) variable inductance.
(D) improved reactive power factor.

Answer ⇓

           D 

 10. A semiconductor device which act like a diode and two transistors is
(A) TRIAC.
(B) DIAC.
(C) UJT.
(D) MOSFET.

Answer ⇓

           C 

 11. UJT is known as
(A) voltage controlled device.
(B) current controlled device.
(C) relaxation oscillator.
(D) triggered device.

Answer ⇓

           A 

 12. A thyristor can termed as
(A) ac switches.
(B) dc switches.
(C) both ac and dc switches.
(D) square wave switches.

Answer ⇓

           B 

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