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Previous Year GATE problems based on Two Wattmeter Method & Energy Meter By- Pawan Chandani

Q1. In a 1-0 induction type energy meter, the lag adjustment is done to ensure that 90using shading rin a. Current coil flux lags the applied voltage by 90 b. Pressure coil flux lags the applied voltage by 90 c. Pressure coil flux is in phase with the applied voltage d. Current coil flux lags the pressure coil flux by 90

Q2. In a 1-0 induction type energy meter, the lag adjustment is done to ensure that using 'shad ing rin a. /Current coil flux lags the applied voltage by 90% Pressure coil flux lags the applied voltage by 90 Pressure coil flux is in phase with the applied voltage Current coil flux lags the pressure coil flux by 90 c. d. Pc I Pc

Q 2. Two Types of connections of Wattmeter pressure coil are shown in the figure. What is the value of the wattmeter current coil resistance r, which make the connection errors the same in the two cases is Re 20 20A !SIV-200V 10X2 Type-1 Type-2

Q 2. Two Types of connections of Wattmeter pressure coil are shown in the figure. What is the value of the wattmeter current coil resistance r, which make the connection errors the same in the two cases is LC MC 20 A 20A V-200V ol Type-1 Type-2 2002 2 N)

Q 3. The power of a 3-0,3- wire balanced system was measured by two wattmeter method. The reading of one of the Wattmeter was found to be double that of the other. What is the power factor of the system?

Q 3. The power of a 3-0,3- wire balanced system was measured by two wattmeter method. The reading of one of the Wattmeter was found to be double that of the other. What is the power factor of the system? 2 canp 3 = 30 N3 cosD COs 300.866 2

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