Two-wattmeter method is used to measure the power taken by a 3-phase induction motor on no load. The wattmeter readings are 375 W and –50 W. Calculate the reactive power taken by the load.

• A. 425√3 VAR
• B. 425/√3 VAR
• C. 325√3 VAR
• D. 325/√3 VAR

Answer: (A)

Reactive power taken, Q = √3*(W1 - W2)
Q = √3*(375 + 50)
Q = √3*425 kVAR