92.An electric motor operate on 50V supply and current of 12A if the efficiency of motor is 30% what is resistance of winding of motor?

Q. An electric motor operating on $50V$ D.C. supply draws a current of $10A$. If the efficiency of the motor is $40\%$, then the resistance of the winding of the motor is:

Q. 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:

Q. An electric motor driven pump fills an overhead tank placed at a height of 20 m from the ground-level sump at a rate of 20,000 litre water per hour.The motor has an operating resistance of $22\Omega$ and is connected across a 220 V source.The efficiency of this motor is (Use$g=9.8m/s^2)$