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GATE 2022 : Electrical Measurement Quiz 6

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Question 1

For single-phase induction energy meter Pressure coil lags voltage by 88°. If circuit is having power factor of unity, then error in measuring Power is ________%. (Take sin88° = 0.99939)

Question 2

A 230 V, 10 A, 1-ϕ energy meter makes 90 revolution in 3 minutes at half load rated voltage and unity power factor. If meter constant is 1800 rev/kWh. Then error at half load will be

Question 3

Two wattmeters are connected to measure the power consumed by a 3- phase balanced load. One of the wattmeters read 1500 W and the other 700 W. Find power factor of the load, when (a) both the readings are positive, and (b) when the reading of the second wattmeter is obtained after reversing its current coil connection.

Question 4

The meter constant of a single phase 230 V, induction energy meter is 600 rev/kWh. The speed of rotation of meter disc for a current of 15 A at 0.8 power factor lagging will be

Question 5

The power consumed by a 3-phase load is measured by two wattmeter method. The power factor of the load is 0.866 and total power consumed is 60 kW. The difference between two wattmeter reading is

Question 6

A single-phase energy meter having meter constant of 300 rev./kWh is operating on 250 V. The load having the load current of 15 A and operating at 0.8 PF lagging for a 3 hour continuously . Find the Number of revolution made by energy meter during this duration.
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Oct 7ESE & GATE EE