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

Looms operated by the electric motors

Two heat engines are operating in such a way that the heat rejected by the first engine is used as the heat input of the second. If both the engines are 40% efficient, then the overall efficiency of the system is

Two heat engines are operating in such a way that the heat rejected by the first engine is used as the heat input of the second. If both the engines are 40% efficient, then the overall efficiency of the system is

The efficiency of d.c. motor is given by eta =

A Carnot’s engine operates with an efficiency of 40% with its sink at 27^(@)C. With an aim to increase the efficiency to 50 %, the amount of increase in temperature of the source is……….K.

A Carnot’s engine operates with an efficiency of 40% with its sink at 27^(@)C. With an aim to increase the efficiency to 50 %, the amount of increase in temperature of the source is……….K.

A Carnot’s engine operates with an efficiency of 40% with its sink at 27^(@)C. With an aim to increase the efficiency to 50 %, the amount of increase in temperature of the source is……….K.

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