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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 6
31.
A thyristor circuit is feeding an R-L load. The turn on time can be reduced by
decreasing R
decreasing L
increasing L
decreasing R and L together
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
A single phase semiconverter is supplying RLE load and has a freewheeling diode across the load. The firing angle is a. The freewheeling diode conducts for
a° in each half cycle
(p - a)° in each cycle
a° in one full cycle
(p + a)° in each half cycle
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
In a full bridge inverter fed by a battery of voltage V, the rms value of fundamental component of output voltage is
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
In a single phase full wave regulator feeding a resistive load, the average current over one full cycle
is always zero
cannot be zero
may be sometimes zero
is always positive
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Two single phase semi-converters are connected in series to form a series converter. The input is v = Vm sin ωt and a1, a2 are the firing angles. If a1 = 0, the dc output voltage is
(1 + cos a2)
(2 + cos a2)
(3 + cos a2)
(4 + cos a2)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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