Answer Any Two
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ANSWER ANY TWO. NO EXTRA SHEETS SHOULD BE USED. ANY ATTEMPT TO MALPRACTICE WILL CANCEL THE CANDIDATURE. PAPER COMMON FOR SECTION B & I. 1. Phase voltage and current of a star connected inductive load is 150V and 25A. Power factor of load is 0.707(lag). Assuming that the system is 3 wire and power is measured using two wattmeter method, find the readings of the both wattmeter. 2. In a balanced 3 phase load 400V circuit, the line current is 100 A. when power is measured by two wattmeter method, one meter reads 30kW and the other zero. What is the power factor of the load? If the power factor were unity and the line current the same, what would be the reading of each wattmeter? 3. Explain in detail, how three phase power can be measured using two-wattmeter method. How is it advantageous over single- wattmeter method and three-wattmeter method?
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Important GATE questions for CA
Transcript of Answer Any Two
ANSWER ANY TWO. NO EXTRA SHEETS SHOULD BE USED. ANY ATTEMPT TO MALPRACTICE WILL CANCEL THE
CANDIDATURE. PAPER COMMON FOR SECTION B & I.
1. Phase voltage and current of a star connected inductive load is 150V and 25A. Power factor of load is 0.707(lag). Assuming
that the system is 3 wire and power is measured using two wattmeter method, find the readings of the both wattmeter.
2. In a balanced 3 phase load 400V circuit, the line current is 100 A. when power is measured by two wattmeter method, one meter
reads 30kW and the other zero. What is the power factor of the load? If the power factor were unity and the line current the
same, what would be the reading of each wattmeter?
3. Explain in detail, how three phase power can be measured using two-wattmeter method. How is it advantageous over single-
wattmeter method and three-wattmeter method?
