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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:
![](https://gradeup-question-images.grdp.co/liveData/PROJ5952/1501908589970677.png)
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?
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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AE & JE ExamsMar 19AE & JE Exams