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Previous Year GATE problems based on Energy Meter By- Pawan Chandani

Q 5. A DC ampere-hour meter is rated 15A, 250V. The meter constant is 14.4 A-sec/rev. The meter constant at rated voltage may be expressed as

Q 5. A DC ampere-hour meter is rated 15A, 250V. The meter constant is 14.4 A-sec/rev. The meter constant at rated voltage may be expressed as K. _ .yx 1448 250-3.6 kW-sec/rev 3.6 3600 IooKwr

Q 6. The disc of a house service energy meter of 230V, 1-0, 50Hz, 5A, 2400 rev/kWh creeps at 1 rev/min. The creep error ( in percentage) of full load unity pf is

Q 6. The disc of a house service energy meter of 230V, 1-0, 50Hz, 5A, 2400 rev/kWh creeps at 1 rev/min. The creep error ( in percentage) of full load unity pf is 1000 N = 2400 x1.15 revjhr N (creeped) = 1 reu/min - 60 rev/ Creepin. Error %Ex 60 - -X100- + 2.17% s4v . 2400 XI.15

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