Rotation Of Universal Motor Multiple Choice Questions and Answers

11. A universal motor operates on

   A.Synchronous speed with varying load

   B.Constant load and varying speed

   C.Approximately constant speed and load

   D.Constant speed and varying load

12. In a universal motor, normally the ratio of width of brush to the width commutator segments is

   A.6:1

   B.4:1

   C.2:1

   D.1:1

13. The direction of rotation of universal motor can be reversed by

   A.Interchanging the brush leads

   B.Switching over from A.C. to D.C.

   C.Reversing the supply terminals

   D.Any of the above

14. When a universal motor is operated on no-load, its speed is limited by

   A.Supply voltage frequency

   B.Armature reaction

   C.Windage and friction

   D.Weight of the armature

15. What could be the size of a universal motor for use in vacuum cleaners

   A.2 H.P.

   B.1 H.P.

   C.3/4 H.P.

   D.1/4 H.P.

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