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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
 10 - 20 W.
 200 - 250 W.
  50 - 150 W.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.9 Ω
 31.1 Ω
 15.1 Ω
 31.9 Ω

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Electrical Machines
What is the function of inter pole in DC generator?

  Both option B and C.
 To get a superior commutation.
 To serve the economical aspects.
 To neutralize the distortion of main field flux due to armature reaction.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  minimum.
  constant.
  maximum.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Shaded pole motor.
  Stepper motor.
 Hysteresis motor.
 Reluctance motor.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 Stepper motor.
 3 - Φ induction motor.
  1 - Φ synchronous motor.
 DC motor.

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