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Quiz 1
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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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