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GATE 2019: Power Electronics Rapid Mini Mock
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Question 1
A dc chopper is equivalent to a
Question 2
A dc chopper is built employing an electronic switch as shown below. Determine the power absorbed by the switch. Assume switch to be ideal.
Question 3
A current signal with harmonics is supplied to an induction motor. Which of the following harmonic will create torque problems in the motor?
Question 4
In PWM inverters, which of the following harmonic is eliminated, if the pulse width is made equal to 72 °
Question 5
In the following circuit, the power P is consumed by the load in the absence of SCR. Then by what factor the power will reduce if the load is fed power in the presence of SCR at α=900.
Question 6
A single phase full converter is feeding a RLE load with R= 5ohms, L= 15mH and E = 100V. The AC source voltage is 230V, 50Hz. For continuous conduction, what will be the average load current for firing angle delay of 450?
Question 7
A single-phase full bridge inverter with square wave output voltage will have in its output waveform a fifth harmonic component. The maximum value of the fifth harmonic component is equal to x percentage of the source voltage, the value of x is _____%.
Question 8
A step-up chopper is used to feed a load at 400 V dc from a 250 V dc source. The inductor current is continuous. If the ‘off’ time of the switch is 20μs, the switching frequency of the chopper is kHz is __________.
Question 9
A single-phase SCR based ac regulator is feeding power to a load consisting of 5Ω resistance and 16 mH inductance. The input supply is 230 V, 50 Hz ac. The maximum firingangle at which the voltage across the device becomes zero all throughout and the rms value of current through SCR, under this operating condition, are
Question 10
A diode circuit feeds an ideal inductor as shown in the figure.Given Vs = 100sin(ωt) V, where ω=100π rad/sec and L = 31.83 mH. The initial value of inductor current is zero. Switch S is closed at t = 2.5 ms. The peak value of inductor current iL (in A) in the first cycle is ________.
Question 11
A single-phase voltage source inverter shown in figure is feeding power to a load. The triggering pulses of the devices are also shown in the figure.
If the load current is sinusoidal and is zero at 0, x, 2x...., the node voltage VAO has the waveform
If the load current is sinusoidal and is zero at 0, x, 2x...., the node voltage VAO has the waveform
Question 12
For a half-wave rectifier circuit with RL source load and supplying power to a DC source from an AC source,
the voltage and current waveforms are shown below.
Determine the value of α at which the diode starts conducting.
the voltage and current waveforms are shown below.
Determine the value of α at which the diode starts conducting.
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Mar 14ESE & GATE EE
