Exercise: Power Electronics

Questions for: Power Electronics

In a single phase full wave converter (M-2 connection) feeding on R - L load, the input voltage is v = Vm sin ωt. The expression for dc output voltage is
A:
B:
C:
D:
Answer: C

Due to inductive load the period of conduction is a to p + a in each half cycle.

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The number of leads in an SCR are :
A:
2
B:
3
C:
4
D:
5
Answer: B

Anode, cathode and gate.

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A single phase half wave rectifier is feeding a resistive load. Input voltage v = Vm sin ωt. The output dc voltage is Vdc and output rms voltage is Vrms . If firing angle is 180°, Vdc and Vrms respectively are
A:
0 and 0
B:
C:
0 and - Vm
D:
Answer: A

Put a = 180° in Eqs

Otherwise also a = 180° means no conduction.

Hence zero output voltage.

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Thyristors are not suitable for logic circuits.
A:
True
B:
False
C:
D:
Answer: B

Thyristors can be used for logic circuits.

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In a thyristor the gate current is increased, then
A:
anode current will increase
B:
anode current will decrease
C:
anode current will remain constant
D:
anode current may increase or decrease
Answer: C

Gate current does not affect the magnitude of anode current.

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