A quarter horse power motor runs at a speed of 600 r . p . m . Assuming 40% efficiency the work done by the motor in one rotation will be

A quarter horse power motor runs at a speed of 600 Ep.m. Assuming 40% efficiency the work done by the motor in one rotation will be:

A quater horse power motor runs at a speed of 600 rpm. Assuming 40% efficiency, the work done by the motor in one rotation will be

The shaft of a motor rotates at a constant speed of 1800 rpm. What is the angle in radians it has turned through in one second ?

A small d.c. motor operating at 200 V draws a current of 5.0 amp.at its full speed of 3000 r.p.m. The resistance of the armature of the motor is 8.5 Omega . Determine the back e.m.f. of the motor. Obtain the power input, power output and efficiency of motor.

A small d.c. motor operating at 200 V draws a current of 5.0 A at its full speed of 3,000 r.p.m. The resistance of the armature of the motor is 8.5 Omega. Determine the back e.m.f. of the motor. Obtain the power input, power output (mechanical) and the efficiency of the motor.

A motor rotates at a constant speed of 25 rev/s. The power delivered by the motor, if it supplies a torque of 60 Nm, is

A pump is used to lift 500 kg of water from a depth of 80 m in 10 s .Calculate : (a)the work done by the pump . (b)the power at which the pump works,and (c )the power rating of the pump if its efficiency is 40% (Take g =10 m s^(-2) ) [Hint :Efficiency= ("use power")/("power input")]

The force needed to pull the tape through an audio cassette player is 0.98 N. In operation the tape travels at a constant speed of 2.5 cm//s The motor consumes a power of 1.8 W. what percentage of the power input to the motor is required to pull the tape at its operating speed ?