Tape recorder

Table fan

Hand operated drilling machine

Record player

reducing mechanical friction

increasing supply voltage

increasing number of poles

increasing supply frequency

squirrel cage induction motor

synchronous motor

slip ring induction motor

D.C. shunt motor

phase sequence is reversed

a D.C. source is connected to stator

one phase is open circuited

power is fed back to mains

improving the power factor

improving the starting torque

starting the motor

reducing the harmonics