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

 

1. The energy output of the crane (2)
2. The power output of the crane (2)
3. The output power of the motor. (2)
4. The input power to the motor. (2)
5. The current taken from a 240V supply (2)
6. The electrical energy consumed in kWh when the motor runs at this load for 4 hours.

Answer rating: 100% (QA)

1 Weight W 5 ton 5 907185 g 5 907185 98 444974 N Energy output w h 444974 50 h 50m 222487123 ... View the full answer