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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 8
46.

Assertion (A): Thyristors can be used in controlled heating, excitation systems of alternators, speed control of motors and HVDC

Reason (R): A static var system using thyristors is very commonly used in high voltage ac systems.

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.
47.
In a dual converter operated in circulating current mode, the circulating current flows
when load current is zero
when load current is non-zero
even when load current is zero
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
For a single phase half wave converter feeding a resistive load, the firing angle a. The waveshape in below figure is for
output voltage
input voltage
voltage drop across thyristor
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
A class B chopper operates in third quadrant.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
In a full bridge circuit supplying an RLC under damped circuit
the waveshapes of output voltage and load current are square
the waveshapes of output voltage and load current are sinusoidal
the waveshapes of output voltage is square but the waveshape of load current is nearly sinusoidal
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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