Q.1
The wattmeter method is used to measure power in a three-phase load. The wattmeter readings areand -35W. Calculate the total active power.
  • a) 360
  • b) 365
  • c) 370
  • d) 375
Q.2
The wattmeter method is used to measure power in a three-phase load. The wattmeter readings areand -35W. Find the power factor.
  • a) 0.43
  • b) 0.53
  • c) 0.63
  • d) 0.73
Q.3
The wattmeter method is used to measure power in a three-phase load. The wattmeter readings areand -35W. Find the reactive power.
  • a) 751.44
  • b) 752.44
  • c) 753.44
  • d) 754.44
Q.4
The input power to a three-phase load is 10kW at 0.8 Pf. Two watt meters are connected to measure the power. Find the reading of higher reading wattmeter.
  • a) 7.165
  • b) 6.165
  • c) 6.165
  • d) 4.165
Q.5
The input power to a three-phase load is 10kW at 0.8 Pf. Two watt meters are connected to measure the power. Find the reading of lower reading wattmeter.
  • a) 1.835
  • b) 2.835
  • c) 3.835
  • d) 4.835
Q.6
The readings of the two watt meters used to measure power in a capacitive load are -andrespectively. Calculate the input power. Assume RYB sequence.
  • a) 5
  • b) 50
  • c) 500
  • d) 5000
Q.7
The readings of the two watt meters used to measure power in a capacitive load are -andrespectively. Find the power factor.
  • a) 0.25
  • b) 0.5
  • c) 0.75
  • d) 1
Q.8
The wattmeter reading while measuring the reactive power with wattmeter is?
  • a) VLILsecØ
  • b) VLILsinØ
  • c) VLILtanØ
  • d) VLILcosØ
Q.9
The total reactive power in the load while measuring the reactive power with wattmeter is?
  • a) √3VLILcosØ
  • b) √3VLILtanØ
  • c) √3VLILsinØ
  • d) √3 VLILsecØ
Q.10
A single wattmeter is connected to measure the reactive power of a three-phase, three-wire balanced load. The line current isand the line voltage is 440V. Calculate the power factor of the load if the reading of the wattmeter isVAR.
  • a) 0.6
  • b) 0.8
  • c) 1
  • d) 1.2
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