Exercise: Power Electronics

Questions for: Power Electronics

In a parallel inverter
A:
the commutating capacitor C is across the primary of transformer and the load is across the secondary
B:
the commutating capacitor and load are connected across the secondary of transformer
C:
the commutating capacitor C and load are connected in series and the combination is across the secondary of transformer
D:
none of the above
Answer: A
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To protect an SCR against high di/dt we connect
A:
a capacitance in series with SCR
B:
a capacitance in parallel with SCR
C:
an inductance in parallel with SCR
D:
an inductance in series with SCR
Answer: D

current through inductance cannot change instantaneously.

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As regards single phase dual converter
A:
the change in operation from one quadrant to the other is faster in non-circulating current mode
B:
the change in operation from one quadrant to the other is faster in circulating current mode
C:
the time response to change in operation from one quadrant to other is the same in both the modes
D:
the time response to change in operation from one quadrant to the other may be faster in any of the two modes
Answer: B
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In a single phase full bridge converter (B - 2 connection), the input voltage is v = Vm sin ωt. The output dc voltage for resistive load
A:
B:
C:
D:
Answer: C

SCRs conduct from a to p in each half cycle.

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In a single phase full wave ac regulator, the firing angles in the two half cycles
A:
are always equal
B:
are sometimes equal
C:
are never equal
D:
may be equal or unequal
Answer: A
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