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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 5
 24
 12
 10

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta.
  star.
None of these
  delta or star according to need.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 3000 rpm
 4000 rpm
 1500 rpm

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P³
 T is independent of P
 T∝ P²
 T∝ P

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 zero.
 less than normal speed.
 normal speed.
 more than normal speed.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  an integral multiple of number of rotor slots.
  either (B) or (C).
  unequal to number of rotor slots and skewed in shape.
  equal to number of rotor slots.

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