Power Electronics (3140915) MCQs

MCQs of DC-DC converters - Switching Voltage Regulators

Showing 1 to 10 out of 51 Questions
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1.
In the ___________ type of chopper, two stage conversions takes place.
(a) AC-DC
(b) AC link
(c) DC link
(d) None of the mentioned
Answer:

Option (b)

2.
Choppers converts
(a) AC to DC
(b) DC to AC
(c) DC to DC
(d) AC to AC
Answer:

Option (c)

3.
A chopper may be thought as a
(a) Inverter with DC input
(b) DC equivalent of an AC transformer
(c) Diode rectifier
(d) DC equivalent of an induction motor
Answer:

Option (b)

4.
Which device can be used in a chopper circuit?
(a) BJT
(b) MOSFET
(c) GTO
(d) All of the mentioned
Answer:

Option (d)

5.
What is the duty cycle of a chopper ?
(a) Ton/Toff
(b) Ton/T
(c) T/Ton
(d) Toff x Ton
Answer:

Option (b)

6.
The load voltage of a chopper can be controlled by varying the
(a) duty cycle
(b) firing angle
(c) reactor position
(d) extinction angle
Answer:

Option (a)

7.
The values of duty cycle (δ) lies between
(a) 0<δ<1
(b) 0>δ>-1
(c) 0<=δ<=1
(d) 1<δ<100
Answer:

Option (c)

8.
If T is the time period for a chopper circuit and δ is its duty cycle, then the chopping frequency is
(a) Ton/δ
(b) Toff/δ
(c) δ/Toff
(d) δ/Ton
Answer:

Option (d)

9.
Find the output voltage expression for a step down chopper with Vs as the input voltage and δ as the duty cycle.
(a) Vo = Vs/δ
(b) Vo = Vs x δ
(c) Vo = Vs2/δ
(d) Vo = 2Vs/δ.π
Answer:

Option (b)

10.
In a step down chopper, if Vs = 100 V and the chopper is operated at a duty cycle of 75 %. Find the output voltage.
(a) 100 V
(b) 75 V
(c) 25 V
(d) none of the mentioned
Answer:

Option (b)

Showing 1 to 10 out of 51 Questions
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