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ELECTRICAL MACHINES

Electrical Machines
The type of DC motor used for shears and punches is

 Shunt motor.
  Cummulative compound motor.
 Differential compound motor.
 Series motor.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  Ia.
  √Ia.
  1/Ia.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to armature current.
 Proportional to the square of armature current.
 Inversely proportional to armature current.
  Constant.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Oscillates around the rated speed.
  Decreases.
 Increases.
 Remains unchanged.

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Electrical Machines
A DC series motor must started on no load because it would

  Run at dangerously high speed.
 Draw more current without producing sufficient torque.
 Not develop starting torque.
 Fail to start without load.

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