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UPPCL EE : Power electronics Quiz 2

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Question 1

The ratio of average to RMS freewheeling diode current in case of single phase semi-converter that is delivering a separately existed DC motor is _______, provide

(i) Armature current = 20 Amp

(ii) Firing angle Delay = 45°

(Consider Armature current is Ripple Free)

Question 2

In order to simplify the design of a converter transformer, the two converters in a dual converter should be connected using:

Question 3

A 1–Փ Halfwave rectifier is supplying power to a RL-Load. If a free-wheeling diode is connected across load then input power factor will:

Question 4

Size of transformer in HWR (Half wave rectifier) as compared to FWR (Full wave rectifier) is:

Question 5

In the triggering pattern of thyristor, the time delay between gating signals of thyristors will be:

Question 6

The effects of source inductance in a phase-controlled rectifier are:

1) Reduction in average output voltage.

2) Increase the reverse bias duration of a thyristor.

3) Reduction in displacement factor.

Question 7

When we compare the half bridge converter and full bridge converter
1) The maximum collector current of a full bridge is only double that of the half bridge.
2) Full bridge uses 4-power switches instead of 2, as in the double bridge.
3) Output power of a full bridge is twice that of a half bridge with the same input voltage and current.
Which of the above statements are correct?

Question 8

While finding various factors of single-phase diode rectifiers, the transformer utilization factor of a half-wave rectifier is

Question 9

For a single phase asymmetrical semi-converter, firing angle is increased from 30° to 45°. Its output voltage will

Question 10

In a 3ϕ semi-converter, for firing angle of 80°, conduction of freewheeling diode, no of pulse obtain will be

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