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The input power to an electric motor is ...

The input power to an electric motor is `200 KW`. Its efficiency is `80%`. It operates a crane of efficiency `90%`. If the crane is lifting a load of `3.6` tonnes, the velocity with which the load moves is

A

`8 ms^(-1)`

B

`4 ms^(-1)`

C

`2 ms^(-1)`

D

`40 ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
`(2)`
`eta = eta_(1) xx eta_(2) , 72/100 P = FV here F = mg`
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