Subject Engineering Electrical Engineering

Question

1. A three phase induction motor is operating at 440 Volts with a mechanical load of 10kW. If the operating power factor of 0.85 and the motor efficiency is 90%, then what is the current drawn by the motor?

2. A fan is drawing a power of 15 kW at 700 RPM. If the speed is reduced to 500 RPM then what would be the power drawn by the fan?

3. A conveyor drive is to be accelerated from zero to a speed of 1500 rev/min in 10 secs. The moment of inertia of the load JL = 4.0 kgm2. The torque of the conveyor load, referred to the motor shaft, is a constant at 520 Nm. The motor being considered is a 110 kW, 1480 rev/m motor with a JM = 1.3 kgm2. Is this motor adequate for this duty?

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Electrical Engineering Questions

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