The wattmeter method is used to measure power in a three-phase load. The wattmeter readings are 400W and -35W. Find the reactive power.

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The wattmeter method is used to measure power in a three-phase load. The wattmeter readings are 400W and -35W. Find the reactive power.

asked Oct 17, 2021 in Education by JackTerrance

The wattmeter method is used to measure power in a three-phase load. The wattmeter readings are 400W and -35W. Find the reactive power. (a) 751.44 (b) 752.44 (c) 753.44 (d) 754.44 This question was addressed to me by my college professor while I was bunking the class. This intriguing question originated from Power Measurement in Three-Phase Circuits topic in portion Polyphase Circuits of Network Theory Select the correct answer from above options network theory questions and answers, network theory questions pdf, network theory question bank, network theory gate questions and answers pdf, mcq on network theory pdf, gate network theory questions and solutions, network theory mcq Test , ies network theory questions, Network theory Questions for GATE EC Exam, Network Theory MCQ (Multiple Choice Questions)

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JackTerrance · Answer 1 · 2021-10-17T03:07:12+0000

Correct option is (c) 753.44 For explanation I would say: Reactive power = √3VLILsinØ. We know that WR – WY = 400-(-35)) = 435 = VLILsinØ. Reactive power = √3 x 435 = 753.44 VAR.