# Electrical Engineering: Power Electronics MCQ

##### 1. Question

In the converter circuit shown below, the switches are controlled such that the load voltage 0(t) is a 400 Hz square wave. The RMS value of the fundamental component of V0(t) in volts is _________ .

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##### 2. Question

For the power semiconductor devices IGBT, MOSFET. Diode and Thyristor, which one of the following statements is TRUE?

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##### 3. Question

The transfer function of a system is given by Vo(s) / Vi(s) =1-s / 1+s

Let the output of the system be V0(t) = Vmsin(ωt+Φ) for the input Vi(t) = Vmsin(ωt). Then the minimum and maximum values of Φ (in radians) are respectively

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##### 4. Question

For the circuit shown in the figure below, assume that diodes D1, D2 and D3 are ideal. `Answer`
##### 5. Question

The figure shows two buck converters connected in parallel. The common input dc voltage for the converters has a value of 100 V. The converters have inductors of identical value. The load resistance is 1 Ω. The capacitor voltage has negligible ripple. Both converters operate in the continuous conduction mode. The switching frequency is 1 kHz, and the switch control signals are as shown. The circuit operates in the steady state. Assuming that the converters share the load equally, the average value of i S1 , the current of switch S1 (in Ampere), is _____ (up to 2 decimal places). `Answer`