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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 remains same.
None of these
 decreases.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

  1435.
 1440.
 1500.
 1450.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 2.5Hz
 51.5Hz
 1.5Hz
 48.5Hz

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the inter polar axis.
 commutator in the polar axis.
 armature in the polar axis.
 armature midway between poles.

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Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
  carbon.
 copper.
 mica.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 load angle.
 excitation.
 both 1 and 2.
 frequency.

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