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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  both.
  none.
  larger output.
  larger bore diameter.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

All of these
 Collecting of large current is simple.
 Insulation requirement is less.
 Operating cost is less.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to not to get saturated.
 In order to get more flux.
All of these
 In order to get saturated.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 1600 W and 1250 W
 3200 W and 5200 W
 1600 W and 5000 W
 3200 W and 2500 W

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 15 %.
 25 %.
  10 %.
 50 %.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

All of these
 to avoid over heating.
 to avoid locking of the armature.
 to achieve a stronger magnetic field.

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