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Practice over 1000+ GATE-level questions from this topic!

Designed to match the latest GATE pattern with topic-wise precision, difficulty tagging, and detailed solutions.

Q#1 Synchronous Machines GATE EE 2000 MCQ +2 marks -0.66 marks

A 2300V, 3-phase synchronous motor driving a pump is provided with a line ammeter and a field rheostat. When the rheostat is adjusted such that the ac line current is minimum, the armature reads 8.8A.
(a) What is the power being delivered to the pump, neglecting losses?

(b) How should the rheostat be adjusted so that the motor operates at 0.8 leading power factor?
(c) How many KVARs is the motor supply to the system at this new power factor?

(a) P=35.056kW,
(b) we should decrease field resistance using rheostat until line ammeter reads 11A

(c) Q=26.29kVAR

(a) P=35.056kW,
(b) we should increase field resistance using rheostat until line ammeter reads 11A

(c) Q=26.29kVAR

(a) P=45.056kW,
(b) we should decrease field resistance using rheostat until line ammeter reads 21A

(c) Q=26.29kVAR

(a) P=45.056kW,
(b) we should decrease field resistance using rheostat until line ammeter reads 11A

(c) Q=16.29kVAR

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