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UPSC Electrical Engineering PYQs 2024 | Vaidra | Vaidra
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Electrical Engineering UPSC PYQ 2024

67 questions from the UPSC 2024 examination. Showing a preview of 3 below — generate a full practice test to solve the rest.

3 questions

1Medium10 marks
The disc in a single-phase energy meter rotates 1320 times when monitoring a 110 V, 3 A load at unity power factor over a period of 8 hours. Calculate the meter constant. If the meter makes 750 revolutions when measuring the energy supplied to a 110 V, 5 A load for 3 hours, determine the load power factor.
2Medium10 marks
Explain the concept of a constellation diagram. Draw the PSK signal constellations for the value of M = 2, 4 and 8, if all have same transmitted signal energy E_s.
3Medium20 marks
(i) Draw the neat and properly labelled output voltage waveform of a three-phase, phase-controlled rectifier having firing angle \alpha. Also derive the relationship for average output voltage in terms of line voltage V_{LL} and firing angle \alpha.
(ii) A three-phase full-wave controlled rectifier is operated from a star-connected, 415 V, 50 Hz supply. This rectifier is feeding a constant current load of 15 kW. It is required to obtain an average output voltage of 80% of maximum possible output voltage. Find the firing angle, r.m.s. value of line current and input power factor. Assume devices are ideal.

64 more Electrical Engineering 2024 questions await

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