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AE 2019 || Day 5 || Power Electronics Quiz 1

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Question 1

In a TRIAC circuit shown, the purpose of resistor R1 is to:

Question 2

The E-MOSFET is normally-off MOSFET when:

Question 3

Which of the following is the fastest switching device?

Question 4

A resistor connected across the gate and cathode of an SCR

Question 5

The frequency of ripple in the output voltage of a three phase controlled bridge rectifier depends on

Question 6

Consider the following statements:
Phase controlled converters at small values of output voltage have
1. Large harmonics in utility system
2. Poor power factor
3. High efficiency
4. Nothces in line voltage waveform
Which of the above statements are correct?

Question 7

For the same voltage output, which one of the following has larger peak inverse voltage of the thyristor?

Question 8

When the firing angle ∝ of a single phase fully controlled rectifier feeding constant d.c. current into load is 30 °, what is the displacement factor of the rectifier?

Question 9

An ideal chopper is operating at a frequency of 500 Hz from a 60 V battery input. It is supplying a load having 3 Ω resistance and 9 mH inductance. Assuming the load is shunted by a perfect commutating diode and assuming battery is loss less, what is the mean load current at an on/off ratio of 1/1?

Question 10

For a 1-phase full-bridge inverter fed from 48 V dc and connected to load resistance of 2.4 Ω, the rms value of fundamental component of output voltage is

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ESE & GATE EE General

Jun 23ESE & GATE EE