Exercise: Power Electronics

Questions for: Power Electronics

A fully controlled bridge converter is feeding an RLE load. The load current is I0. The input voltage is Vm sin ωt. The KVL equation to find firing angle a is
A:
cos a = E + I0R
B:
cos a = E + I0R
C:
cos a = E - I0R
D:
cos a = E - I0R
Answer: A
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A LASCR has
A:
4 semiconductor layers and 3 junctions
B:
3 semiconductor layers and 2 junctions
C:
2 semiconductor layers and 2 junctions
D:
any of these depending on the rating
Answer: A
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In Jone chopper, the commutating element
A:
is a capacitor
B:
is a capacitor and an inductor
C:
is a capacitor and an auto transformer
D:
none of the above
Answer: C
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A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to
A:
decrease the firing angle
B:
increase the firing angle
C:
either decrease or increase the firing angle depending on the required speed
D:
decrease the load torque
Answer: A
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When an SCR is reverse biased
A:
two junctions are reverse biased and one junction is forward biased.
B:
all the three junctions are reverse biased.
C:
one junction is reverse biased and two junctions are forward biased.
D:
any of the above depending on the magnitude of reverse bias.
Answer: A
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