Exercise: Power Electronics

Questions for: Power Electronics

In pulse width modulation of chopper
A:
T is kept constant and Ton is varied
B:
Ton is kept constant T is varied
C:
both T and Ton are varied
D:
either T or Ton is varied
Answer: A
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In a stud mounted SCR, the stud is
A:
in thermal contact with heat sink
B:
insulated from heat sink
C:
in electrical and thermal contact with heat sink
D:
in either electrical or thermal contact with heat sink
Answer: C
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In a 3 phase full converter, the firing angle is less than 60°. The instantaneous output voltage
A:
will have positive part only
B:
will have both positive and negative parts
C:
may have both positive and negative parts
D:
will have negative part if load is inductive
Answer: A
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The gate lead, in a thyristor is welded to :
A:
p layer to which anode is connected
B:
n layer nearest to the anode terminal
C:
p layer nearest to the cathode terminal
D:
outside n layer
Answer: B
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In a thyristor, the forward breakover voltage
A:
is constant
B:
may be constant or may depend on gate current
C:
decreases as gate current is increased
D:
increases as gate current is increased
Answer: C
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