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1

### GATE EE 2014 Set 2

Numerical
A step-up chopper is used to feed a load at $$400$$ $$V$$ $$dc$$ from a $$250$$ $$V$$ $$dc$$ source. The inductor current is continuous. If the ‘off’ time of the switch is $$20\,\,\mu s,$$ the switching frequency of the chopper in $$kHz$$ is ________.

Correct answer is between 31 and 31.5
2

### GATE EE 2010

The power electronic converter shown in the figure has a single-pole double-throw switch. The pole $$P$$ of the switch is connected alternately to throws $$A$$ and $$B.$$ The converter shown is a A
step-down chopper (buck converter)
B
half-wave rectifier
C
step-up chopper (boost converter)
D
full-wave rectifier
3

### GATE EE 2002

A step down chopper is operated in the continuous conduction mode in steady state with a constant duty ratio $$D.$$ If $${V_0}$$ is the magnitude of the $$dc$$ output voltage and if $${V_s}$$ is the magnitude of the $$dc$$ input voltage, the ratio $${{{V_0}} \over {{V_s}}}$$ is given by
A
$$D$$
B
$$1-D$$
C
$${1 \over {1 - D}}$$
D
$${D \over {1 - D}}$$
4

### GATE EE 1996

In a thyristor $$dc$$ chopper which type of commutation results in best performance?
A
Voltage commutation
B
Current commutation
C
D
Supply commutation
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#### Questions Asked from Choppers and Commutation Techniques

On those following papers in Marks 1
Number in Brackets after Paper Indicates No. of Questions
GATE EE 2016 Set 1 (1)
GATE EE 2015 Set 1 (1)
GATE EE 2014 Set 2 (1)
GATE EE 2010 (1)
GATE EE 2002 (1)
GATE EE 1996 (1)
GATE EE 1995 (2)
GATE EE 1994 (1)
GATE EE 1993 (1)

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NEET

Class 12