GATE 2016 EE (EE2) – Question 64

Electrical and Electronic Measurements · Measurement of voltage, current, power, energy and power factor · 2 marks · Numerical answer

An energy meter with constant 1200 revolutions/kWh makes 20 revolutions in 30 seconds at constant load. The load in kW is ________.

Show answer and explanation

Correct answer: 1.9 to 2.1

Explanation

Twenty revolutions represent energy 20/1200=1/60 kWh. The elapsed time is 30/3600=1/120 hour.

Power is energy divided by time: (1/60)/(1/120)=**2 kW**, within the official 1.9–2.1 interval.

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