Electrical Machines and Drives

20 to 30 m/s ✘ 10 to 15 m/s ✘ 5 to 10 m/s ✘ 1 to 2.5 m/s ✔

Squirrel cage induction motor ✘ Wound rotor induction motor ✘ Synchronous motor ✘ D.C. motor ✔

Synchronous motor ✘ D.C. differentially compound motor ✘ Ward-Leonard controlled D.C. shunt motor ✘ A.C. slip ring motor ✔

type of drive ✘ span ✘ tonnes ✘ any of the above ✔

Precise control ✘ Smooth movement ✘ Fast speed control ✘ All of the above ✔

Single phase motor ✘ Synchronous motor ✘ A.C. slip-ring motor ✘ Ward-Leonard controlled D.C. shunt motor ✔

Shaded pole motor ✘ Repulsion motor ✘ Capacitor start motor ✘ None of the above ✔

Unsuitable for heavy duty starting ✘ Torque varies as armature current ✘ Armature current is a straight line ✘ Torque is zero for zero armature current ✔

Oil expeller ✘ Floor mill ✘ Lifts and hoists ✘ Centrifugal pump ✔

Totally enclosed ✘ Totally enclosed fan cooled ✘ Open type ✘ Semi closed ✔