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ESE 2021 Technical Quiz || Measurement of Power & Energy, Power Factor

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Question 1

There will be serious errors if power factor of non-sinusoidal waveform is measured by electrodynamometer power factor meter. This is true for

Question 2

The meter constant of single phase 220 V Induction type wattmeter is 500 rev/kWh. The speed of the meter disc for a current of 10 A at 0.8 power factor lagging will be

Question 3

A single phase energy meter of the induction type is rated 230 V, 10 A, 50 Hz and has a meter constant of 600 rev/kWhr when currently adjusted. If quadrature adjustment is slightly disturbed so that the lag is 85°, calculate the percentage error of full load, 0.8 pf lag?

Question 4

The voltage flux adjustment in a certain single phase 200 V induction watt-hour meter is altered so that the phase angle between the applied voltage and the flux is due to it is 85⁰. Find the % error in the reading when current through the meter is 6 A at 0.75 lagging power factor.

Question 5

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
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May 31ESE & GATE EE