The input power to an elctric 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

800 kW power is supplied to a motor of 70% efficiency. This motor is in turn connected to a crane, whose efficiency is also 70%. If this crane lifts a 20 ton rock, its velocity is

An electric motor operates with an efficiency of 90% . A pump operated by the motor has an efficiency of 80% . The overall efficiency of the system is

Transformer works on 220V. Its efficiency is 80% Output power is 8 kW. Primary current is approximately

The efficiency of a rough inclined plane is 90%. The energy spent in raising a load of 225 N through 2 m is

Initial voltage and input power of a transformer of effieciency 80% are 100 V and 4 kW, respectively. IF the voltage of the secondary coil is 200 V, determine the currents flowing through the primary and the second ary coils?

A hoist powered by a 15 kW motor is used to raise a 500 kg bucked to a height of 80 m. If the efficiency is 80% . Find the time required.

A lifting machine, having an efficiency of 80 % uses 2500 J of energy in lifting a 10 kg load over a certain height. If the load is now allowed to fall through that height freely, its velocity at the end of the fall will be (g =10 m//s^(2))

The efficiency of a simple machine having mechanical advantage 5 is 80% . If the displacement of the effort in lifting a load by using the machine is 20 cm, find the displacement of the load.

A transormer has an efficiency of 80%. It is connectes to a power input of 5 kW at 200 V. It the secondary voltage is 250 V, the primary and secondary currents are respectively