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

Q7. A 220V, one-phase watt hour meter records a constant load of 8A for five hours at 0.9 pf. If the meter disc makes 2400 revolutions during this period, what is the meter constant in revolutions/kWh? a) 203 rev/kWh b) 303 rev/kWh (PSPCL JE, 2018) c) 103 rev/kWh d) 403 rev/kWh

Q7. A 220V, one-phase watt hour meter records a constant load of 8A for five hours at 0.9 pf. If the meter disc makes 2400 revolutions during this period, what is the meter constant in revolutions/kWh? a) 203 rev/kWh b) 303 rev/kWh (PSPCL JE, 2018) c) 103 rev/kWh d) 403 rev/kWh 220 x 8 X o.9 1.584kn 1000 2400 E (kWh) 303.03 rev/KWh 7.92

Q 8. lf an energy meter disc makes 30 revolutions in 200 seconds when a load of 850W is connected to it, the meter constant is rev/kWh.

Q 8. If an energy meter disc makes 30 revolutions in 200 seconds when a load of 850W is connected to it, the meter constant is rev/kWh. P 850 0.850 Kn) 3600 30 E (kWh) 0.047 22

Q 9. An energy meter is designed to make hundred revolutions of disc for 1 unit energy. Calculate the number of revolutions made by the disc when connected to load carrying 50A at 230V and 0.6 pf for an hour. a) 690 revolutions b) 575 revolutions c) 920 revolutions d) 1150 revolutions (Coal India MT 2017)

Q 9. An energy meter is designed to make hundred revolutions of disc for 1 unit energy. Calculate the number of revolutions made by the disc when connected to load carrying 50A at 230V and 0.6 pf for an hour. a) 690 revolutions b) 575 revolutions c) 920 revolutions d) 1150 revolutions (Coal India MT 2016-17) 10DrevK 10D 1 unit - 1 KWh 0 6.9 kW 1000

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