THREE PHASE CIRCUIT - Practice Mode

1) Which method is used for 3f power measurement when load is unbalanced?

One watt meter method Voltmeter method Ammeter method Three watt meter method

Correct Answer: Three watt meter method

2) What is the value of power factor when two watt meter readings are equal in 2 watt meter method of power measurement?

Unity 0.5 lagging 0.5 leading Less than 0.5

Correct Answer: Unity

3) What is the reading in second watt meter W2 if the first watt meter reading is W1 = 100W at the p.f 0.5?

200W Zero 100W 50W

Correct Answer: Zero

4) What is the formula for total power in three watt meter method of power measurement?

W1 - W2 W1+W2+W3 W1+W2 W1(W2+W3)

Correct Answer: W1+W2+W3

5) Where two watt meter method of power measurement is used?

Balanced load only Unbalanced load only Balanced and unbalanced load Half full load

Correct Answer: Balanced and unbalanced load

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