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Electrical Machines

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

 36
 74
 72
 37

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Electrical Machines
Flux density under leading pole tips in case of generator will

 increase
None of these
 either increase or decrease
 decrease

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 50 Hz.
 25 Hz.
 Zero Hz.
 100 Hz.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 torque.
 power.
 speed.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy copper or aluminium bars placed in rotor slots.
  single phase winding.
  heavy short-circuited end rings.
  three phase winding.

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and low
 low and high
 low and low
 high and high

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