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Wireman
THREE PHASE CIRCUIT
Set 2
Set 2
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Q14225
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Which method is used for 3f power measurement when load is unbalanced?
A
One watt meter method
B
Voltmeter method
C
Ammeter method
D
Three watt meter method
Q14226
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What is the value of power factor when two watt meter readings are equal in 2 watt meter method of power measurement?
A
Unity
B
0.5 lagging
C
0.5 leading
D
Less than 0.5
Q14227
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What is the reading in second watt meter W2 if the first watt meter reading is W1 = 100W at the p.f 0.5?
A
200W
B
Zero
C
100W
D
50W
Q14228
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What is the formula for total power in three watt meter method of power measurement?
A
W1 - W2
B
W1+W2+W3
C
W1+W2
D
W1(W2+W3)
Q14229
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Where two watt meter method of power measurement is used?
A
Balanced load only
B
Unbalanced load only
C
Balanced and unbalanced load
D
Half full load
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