Exercise: Power Electronics

Questions for: Power Electronics

The total number of leads in MOS controlled thyristor is
A:
2
B:
3
C:
4
D:
2 or 3
Answer: B
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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
A:
(1 + cos a2)
B:
(2 + cos a2)
C:
(3 + cos a2)
D:
(4 + cos a2)
Answer: C
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In a single phase full wave regulator feeding a resistive load, the average current over one full cycle
A:
is always zero
B:
cannot be zero
C:
may be sometimes zero
D:
is always positive
Answer: A
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In a full bridge inverter fed by a battery of voltage V, the rms value of fundamental component of output voltage is
A:
B:
C:
D:
Answer: B
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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:
a° in each half cycle
B:
(p - a)° in each cycle
C:
a° in one full cycle
D:
(p + a)° in each half cycle
Answer: A
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