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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 V²
 applied voltage V
 1/V

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Electrical Machines
Universal motors are used in

 cranes
 food processing
 traction
All of these

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Electrical Machines
The rotor speed of an induction motor is given by

  Nr = 120f / p × (1-s).
None of these
  Ns = 120f /p × ( 1 - r).
  Ns = 120f / p × ( 1 - s ).

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 DC series generator.
 None of these.
 Compounded DC generator.

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of field flux on the armature flux.
  Effect of armature flux on the main field flux.
 Effect of armature flux on the load.
None of these

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 cast iron.
 carbon.
 silicon steel.

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