Special Electrical Machines

1. Which of the following applications make use of a universal motor

• A.Portable tools

• B.Lathe machines

• C.Oil expeller

• D.Floor polishing machine

A variable reluctance stepper motor is constructed of .................. material with salient poles.

• (a) paramagnetic

• (b) ferromagnetic

• (c) diamagnetic

• (d) non-magnetic

A universal motor is one which

• Is available universally

• B.Can be marketed internationally

• C.Can be operated either on dc or ac supply

• D.Runs at dangerously high speed on no-load