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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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Network Analysis 259 0 0
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Control Systems 201 0 0
Analog Electronics 180 0 0
Digital Electronics 148 0 0
Electrical Machines 390 0 0
Power Electronics 237 0 0
Power Systems 343 0 0
EMFT EE 9 0 0
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