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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 8
21.
In a modified series inverter
the maximum output frequency is less than frequency of damped oscillations
the output frequency can be even higher than the frequency of damped oscillations
the output frequency cannot exceed the frequency of damped oscillations
any of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.

Assertion (A): Light triggering is very suitable for HVDC transmission.

Reason (R): Light triggering has the advantage of complete electrical isolation of gate circuit.

Both A and R are correct and R is correct explanation of A
Both A and R correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Class A and class B chopper
operate in first quadrant
operate in second quadrant
class A chopper operates in first quadrant while class B operates in second quadrant
may operate in either first or second quadrant
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
To turn off an SCR, it is necessary to reduce its current to less than :
trigger current
holding current
breakover current
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
When a single phase dual converter is operating in circulating current mode
both converters are working as rectifiers simultaneously
one converter is always working as rectifier and the other as inverter
only one converter is working at one time
both converters are either working as rectifiers or as inverters simultaneously
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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