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GATE 2020 || Power Electronics || National Champion Test (App update required to attempt this test)
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Question 1
A non-sinusoidal load current expressed in Fourier series form as:
is produced when a sinusoidal voltage source of
is applied to a non-linear load.
Determine the distortion factor of the load current.
is produced when a sinusoidal voltage source of
is applied to a non-linear load. Determine the distortion factor of the load current.
Question 2
Figure (a) shows a 3-φ inverter fed by a constant voltage source Vs and connected to a balanced resistive load at the output. Each switching device may conduct for 120 ° or for 180 °. The waveform shown in figure (b) is,
Question 3
In the circuit shown below, 
If Vs = 200 V, R1 = 10 Ω and R2 = 100 Ω then the peak current through T2 in Amp ?
Question 4
Read the following statements carefully:
1- MOSFET is a majority carrier device.
2- IGBT is a unipolar device
3- BJT is a bipolar device.
4- MCT is a unipolar device.
From above, the correct statements are
1- MOSFET is a majority carrier device.
2- IGBT is a unipolar device
3- BJT is a bipolar device.
4- MCT is a unipolar device.
From above, the correct statements are
Question 5
A chopper circuit shown below has input dc voltage of 200 V and a load of R = 10 Ω in series with an inductor of L = 80 mH. If load current varies linearly between 12 A and 16 A, then time ratio 
for this chopper is ---------. 
Question 6
Find out the value of pulse width so that output is free from 5th harmonics?
Question 7
In the circuit shown all elements are ideal and the switch S is operated at 10 kHz and 60% duty ratio. The capacitor is large enough so that the ripple across it is negligible and at steady state acquires a voltage as shown. The peak current in amperes drawn from the 50 V DC source is ________. (Give the answer up to one decimal place.)
Question 8
In the circuit shown below.
If the chopper is switched at 1 kHz and with a duty cycle 0.5 then the peak to peak ripple in the load current is ________ A.
If the chopper is switched at 1 kHz and with a duty cycle 0.5 then the peak to peak ripple in the load current is ________ A.
Question 9
The switching waveforms of the transistor switch is shown in figure. duty cycle α is 50% and switching frequency is 10 kHz determine :
Average power loss [in Watt] due to collector current during turn on process :
Average power loss [in Watt] due to collector current during turn on process :
Question 10
A single phase diode bridge rectifier circuit has an AC source of Vm = 150 V at 50 Hz. It is connected to a series RL load with R = 18 Ω and L = 12 mH. Determine the average load current (in A).
Question 11
A single phase VSI is switched using SPWM technique. It is supplied by a dc source of 150V and pulse width of 1200. Find the rms value of fundamental component present in the output voltage waveform.
Question 12
For a power diode, the reverse recovery time is 3.9µs and the rate of diode current decay is 50A/ µs. For a softness factor of 0.3, the storage charge [in µC] in power diode is...?
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Nov 22ESE & GATE EE
