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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 7
26.
An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be
25 A
12.5 A
less than 25 A
less than 12.5 A
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
The output wave of a cycloconverter consists of a number of segments derived from the input wave.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
A class A chopper has an input voltage of 200 V. Ton = 1.5 ms and Toff = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are
0.5, 100 V and 1
0.25, 50 V and 3
0.25, 50 V and 1
0.5, 100 V and 3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
In a parallel inverter the turn off time tq of thyristor and values of commutating elements L and C are related as
tq = pLC
tq = LC
tq = LC
tq = LC
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
A TRIAC can be turned on :
by applying a positive signal to gate
by applying a negative signal to gate
by applying either positive or negative signal to gate
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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