GATE EE 2019 Set 1 — Question 21
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Electrical Machines → Synchronous Machines → V-Curves
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Question
A three-phase synchronous motor draws 200 A from the line at unity power factor at rated load. Considering the same line voltage and load, the line current at a power factor of 0.5 leading is
Correct answer
(D) 400 A
Solution
For a three-phase synchronous motor, the real power is given by . Given:
Case 1: A, (unity power factor).
Case 2: (leading).Since the load and line voltage remain the same, :Thus, the line current is 400 A.
Case 1: A, (unity power factor).
Case 2: (leading).Since the load and line voltage remain the same, :Thus, the line current is 400 A.
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