# Electrical Engineering: Power Electronics MCQ

##### 36. Question

In the circuit shown,the input V is a sinusoidal AC voltage having an RMS value of 230 ± 20%. The worst-case peak – inverse voltage seen across any diode is ____ V.

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##### 37. Question

A single -phase full – bridge inverter fed by a 325V DC produces a symmetric quasi-square waveform across `ab` as shown. To achieve a modulation index of 0.8 the angle θ expressed in degree should be ____

(Modulation index is defined as the ratio of the peak of the fundamental component of A single -phase full – bridge inverter fed by a 325V DC produces a symmetric quasi-square waveform across `ab` as shown. To achieve a modulation V_{ab} to the applied DC value)

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##### 38. Question

A CMOS Schmitt-trigger inverter has a low output level of 0V and a high output level of 5V. It has thresholds of 1.6 V and 2.4V. The input capacitance and output rsistance of the schmitt-trigger are negligible. The frequency of the oscillator shown is _____Hz

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##### 39. Question

consider the boost converter shown.Switch Q is operating at 25khz with a duty cycle of 0.6. Assume the diode and switch to be ideal.Under steady-state condition ,the average resistance R_{in} as seen by the source is ____Ω

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##### 40. Question

In the BJT circuit shown, beta of the PNP transistor is 100. Assume V_{BE} = -0.7 V. The voltage across R_{C} will be 5V when R_{2} is ____kΩ.

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