Exercise: Power Electronics

Questions for: Power Electronics

The two-transistor model of a thyristor consists of two transistors :
A:
one n-p-n and other p-n-p
B:
both p-n-p
C:
both n-p-n
D:
one n-p-n and other UJT
Answer: A
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In brushless excitation system of modern alternators, the main exciter is
A:
dc generator
B:
ac generator
C:
either dc or ac generator
D:
induction generator
Answer: B
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A full bridge inverter is fed by a battery of 30 V. The rms value of output voltage is
A:
15 V
B:
152 V
C:
30 V
D:
302 V
Answer: C
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In the circuit of figure, the load current when thyristor is off
A:
is constant
B:
increases exponentially
C:
decreases exponentially
D:
zero
Answer: C
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In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle
A:
is zero
B:
is 60°
C:
is more than 60°
D:
is more than 90°
Answer: C
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