Electrical Engineering
GATE EE year:2021 PYQs
Build your understanding with focused practice from past exam papers.
Questions 61–65 of 65. Imported answers require independent review unless marked reviewed.
Question 51
Open questionEENAT2 marksNeeds review
A 100 Hz square wave, switching between 0 V and 5 V, is applied to a CR high-pass filter circuit as shown. The output voltage waveform across the resistor is 6.2 V peak-to-peak. If the resistance R is 820 Ω, then the value C is _____ μF. (Round off to 2 decimal places.)
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Open questionEENAT2 marksNeeds review
A CMOS Schmitt-trigger inverter has a low output level of 0 V and a high output level of 5 V. It has input thresholds of 1.6 V and 2.4 V. The input capacitance and output resistance of the Schmitt-trigger are negligible. The frequency of the oscillator shown is ________ Hz.
(Round off to 2 decimal places.)
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Open questionEENAT2 marksNeeds review
Consider the boost converter shown. Switch Q is operating at 25 kHz with a duty cycle of 0.6. Assume the diode and switch to be ideal. Under steady-state condition, the average resistance
as seen by the source is ________
.
(Round off to 2 decimal places.) 
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Open questionEENAT2 marksNeeds review
Consider the buck-boost converter shown. Switch Q is operating at 25 kHz and 0.75 duty-cycle. Assume diode and switch to be ideal. Under steady-state condition, the average current flowing through the inductor is ________ A.
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Open questionEENAT2 marksNeeds review
A single-phase full-bridge inverter fed by a 325 V DC produces a symmetric quasi-square waveform across ‘ab’ as shown. To achieve a modulation index of 0.8, the angle
expressed in degrees should be ________.
(Round off to 2 decimal places.)
(Modulation index is defined as the ratio of the peak of the fundamental component of
to the applied DC value.) 
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