GATE EE 2018 Paper 1 — page 21

Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.

A 3-phase 900 kVA,

(

/Y), 50 Hz transformer has primary (high voltage side) resistance per phase of 0.3

and secondary (low voltage side) resistance per phase of 0.02

. Iron loss of the transformer is 10 kW. The full load % efficiency of the transformer operated at unity power factor is ________ (up to 2 decimal places).

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A 200 V DC series motor, when operating from rated voltage while driving a certain load, draws 10 A current and runs at 1000 r.p.m. The total series resistance is 1

. The magnetic circuit is assumed to be linear. At the same supply voltage, the load torque is increased by 44%. The speed of the motor in r.p.m. (rounded to the nearest integer) is ______.

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A dc to dc converter shown in the figure is charge a battery bank, B2 whose voltage is constant at 150 V. B1 is another battery bank whose voltage is constant at 50 V. The value of the inductor, L is 5 mH and the ideal switch, S is operated with a switching frequency of 5 kHz with a duty ratio of 0.4. Once the circuit has attained steady state and assuming the diode D to be ideal, the power transferred from B1 to B2 (in Watt) is __________ (up to 2 decimal places).

Diagram for Electrical Engineering question 53

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2018 · Paper 1

Question 51

Question 52

Question 53