Power Electronics Questions and Answers – Type C Chopper

This set of Power Electronics Multiple Choice Questions & Answers (MCQs) focuses on “Type C Chopper”.

1. Name the below given circuit.

a) Type D chopper
b) Type B chopper

Explanation: It is a type C chopper or Two quadrant type A chopper. It operates in the first and second quadrant.

2. In the below given circuit output voltage will be 0 when

a) SW1 is on
b) FD is not conducting
c) D2 is conducting
d) SW2 is on

Explanation: Output voltage will be zero if SW 2 is on, because it will short circuit the load circuit and output voltage will be zero.

3. In the below given circuit

a) current can never be zero
b) current can flow in both the directions of the load
c) voltage can never be zero
d) none of the mentioned

Explanation: In type C chopper, current can flow in both the directions. It would be negative if SW2 in on or D2 conducts.

4. In the below given type C chopper circuit, _______ and _________ together operate like type A chopper.

a) CH1, FD
b) CH2, FD
c) CH1, D2
d) CH2, D2

Explanation: In the above shown type C chopper circuit, when CH1 is on and current flows VS-CH1-L-E-Vs. When CH1 is switched off, current freewheels through the FD. Hence, current and voltage both are positive giving type A chopper operation.

5. In the below given type C chopper circuit, ________ and ___________ together operate like type B chopper.

a) CH1, FD
b) CH2, FD
c) CH1, D2
d) CH2, D2

Explanation: In the above shown type C chopper circuit, when CH2 is on current flows in the negative direction E-L-CH2-E and hence voltage is zero. When D2 operates E and L deliver power to the supply Vs hence, giving a type B chopper operation.

6. Which type of chopper is used in the regenerative braking of DC motors?
a) type A
b) type B
c) type C
d) type D

Explanation: In regenerative braking of DC motors, power needs to flow from load to source as well as source to load depending on whether the machine is in the motoring mode or generative braking.

7. Type C chopper consists of
a) two diodes and two switches
b) one diode and one switch
c) one diode and three switches
d) three diodes and two switches

Explanation: Type C consists of, two diodes and two switches. One diode switch pair is used for operation in a particular quadrant.

8. In a type C chopper, if only one switch is operated
a) only one quadrant operation will be obtained
b) two quadrant operation can be obtained
c) the chopper won’t work
d) none of the mentioned

Explanation: Only one quadrant operation will be operated if only one switch is used. It can be either 1st and 2nd quadrant depending on which switch is operated.

9. A type C chopper is operated with only positive load current. Choose the correct statement.

a) CH1 would remain idle
b) D2 would remain idle
c) CH2 would remain idle
d) Both D2 and CH2 would remain idle

Explanation: It is a type C chopper or two quadrant type A chopper. It operates in the first and second quadrant. CH1 and FD in the first quadrant and CH2 and D2 in second quadrant.

10. A type C chopper is operated with only negative load current. Choose the correct statement.

a) CH1 would remain idle
b) FD would remain idle
c) CH2 would remain idle
d) Both FD and CH1 would remain idle

Explanation: It is a type C chopper or two quadrant type A chopper. It operates in the first and second quadrant. CH1 and FD in the first quadrant and CH2 and D2 in second quadrant.

Sanfoundry Global Education & Learning Series – Power Electronics.

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