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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 full load
 any of the above
 no load
 half load

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

 Split phase motor.
 Shaded pole motor.
  PSC (permanent split capacitor) motor.
None of these

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  zero.
  high.
  medium.
  low.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = N1 / N2.
  E1 / E2 = 1.
  E1 / E2 = N1kw1 / N2kw2.

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 36
 72
 74
 37

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 1, 3
 2, 4
 2, 3
 1, 4

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