Choppers - Electrical Engineering (MCQ) questions and answers

1)   In a flyback converter, the inductor of the buck-boost converter has been replaced by a

a. Flyback capacitor
b. Flyback resistor
c. Flyback transformer
d. Flyback transistor
Answer  Explanation 

ANSWER: Flyback transformer

Explanation:
No explanation is available for this question!
2)   For bidirectional operation of converters

a. A parallel combination of controllable switch and a diode is used
b. A parallel combination of controllable switch and capacitor is used
c. A series combination of controllable switch and a diode is used
d. A series combination of controllable switch and a capacitor is used
Answer  Explanation 

ANSWER: A parallel combination of controllable switch and a diode is used

Explanation:
No explanation is available for this question!
3)   For a buck converter to reduce the conduction losses in diode

a. A high on - resistance switch can be added in parallel
b. A low on - resistance switch can be added in parallel
c. A high on - resistance switch can be added in series
d. A low on - resistance switch can be added in series
Answer  Explanation 

ANSWER: A low on - resistance switch can be added in parallel

Explanation:
No explanation is available for this question!
4)   A step - down choppers can be used in

a. Electric traction
b. Electric vehicles
c. Machine tools
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
5)   The output current in PWM DC - DC converters is equal to

a. Average value of the output inductor current
b. Product of an average inductor current and a function of duty ratio
c. Either (a) or (b)
d. None of these
Answer  Explanation 

ANSWER: Either (a) or (b)

Explanation:
No explanation is available for this question!
6)   Advantages of Cuk converter is / are

a. Large number of reactive component
b. Low stress on switch
c. Low stress on capacitor
d. None of these
Answer  Explanation 

ANSWER: None of these

Explanation:
No explanation is available for this question!
7)   In a push - pull converter, the filter capacitor can be obtained as

a. Cmin = V / ( Vr L f2 )
b. Cmin= ( 1 – D ) V / ( Vr L f2 )
c. Cmin= ( 1 – 2 D ) V / 32 ( Vr L f2 )
d. Cmin= ( 1 – 2 D ) V / 42 ( Vr L f2 )
Answer  Explanation 

ANSWER: Cmin= ( 1 – 2 D ) V / 32 ( Vr L f2 )

Explanation:
No explanation is available for this question!
8)   The control method used for PWM dc - dc converter is

a. Voltage mode control
b. Current mode control
c. Hysteric control
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
9)   The average value of the output voltage in a step - down dc chopper is given by

a. V 0 = V s
b. V 0 = D V s
c. V 0 = V s / D
d. V 0 = V s / ( 1 - D )
Answer  Explanation 

ANSWER: V 0 = D V s

Explanation:
No explanation is available for this question!
10)   Choppers is a

a. AC - DC converters
b. AC - AC converters
c. DC - AC converters
d. DC - DC converters
Answer  Explanation 

ANSWER: DC - DC converters

Explanation:
No explanation is available for this question!

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