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GATE 2020 || Measurements || Quiz 6

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Question 1

A 50A, 230V meter on full load test, makes 61 revolutions in 37 sec normal disc speed is 520 rev/kWhr. The percentage error is

Question 2

The line-to-line input voltage to the 3 phase, 50 Hz, ac circuit shown in the following figure is 100 V rms. Assuming that the phase sequence is RYB, the wattmeters would read
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Question 3

watt hour meter has a constant current of 4 A passing through it for 6 hours at unity power factor. If the meter disc makes 2208 revolutions during this period, calculate the power factor of the load if the number of revolutions made by the meter are 1472 when operating at 230 V and 5 A for 4 hours.

Question 4

Find the individual readings of the wattmeter if the input power to a 3Φ load is 10 KW to 0.8 P.f. two watt meters are connected to measure the power?

Question 5

The declared constant of 5A, 220V DC watthour meter is 3275 Rev/kwh. In a test run at half load, the meter takes 59.5 sec to complete 30 revolutions. The error of meter is______

Question 6

The disc of a energy meter of 230 V, 5 A, 1-φ, 50 Hz having meter constant of 2400 rev/KWh and meter creeps at 1 rev/min, then find the error (in present) at full load with unity pf is __________%.

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ESE & GATE EE Electrical & Electronic Measurements

Dec 9ESE & GATE EE