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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Field.
 Coupling mounted on the shaft.
 Motor frame.
 Armature.

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Electrical Machines
Transformer oil is used as

 both A and B.
 inert medium.
 a coolant.
 an insulator.

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  eliminate noise.
  balance the rotor dynamically.
  facilitate cooling of rotor.
  none of these.

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

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

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 both Eb and Td are unchanged
 Eb is zero, but Td is unchanged
 both Eb and Td are zero
 Eb is unchanged, but Td is zero

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Electrical Machines
The direction of rotation of a DC motor can be determined by

  Fleming's left hand rule.
 Ampere's law.
 Fleming's right hand rule.
 Lenz's law.

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