A crane driven by an electric motor lifts 5 ton of building material in one minute to a height of 50m.

QUESTION:

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A crane driven by an electric motor lifts 5 ton of building material in one minute to a height of 50m. The motor has an efficiency of 92% and the crane has an efficiency of 96%. Sketch the block diagram of the cascaded system and calculate the following:

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Figure 1:

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1. The energy output of the crane.

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2. The power output of the crane.

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3. The output power of the motor.

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4. The input power to the motor.

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5. The current taken from a 240V supply.

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6. The electrical energy consumed in kWh when the motor runs at this load for 4 hours?

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