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Electrical Machines

Electrical Machines
Universal motors are used in

 food processing
 cranes
 traction
All of these

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Electrical Machines
The slot edges in a DC machine are made of

 Silicon steel.
 Mild steel.
  Fibre.
 Cast iron.

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 150Hz.
 200Hz.
 100Hz.
 50Hz.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Starting torque.
 Starting torque, operating speed, full load current.
 Operating speed.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Both 1 and 2
 Eddy current losses
 Copper losses
 Hysteresis losses

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

 100 Hz.
 25 Hz.
 50 Hz.
 Zero Hz.

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MORE MCQ ON Electrical Machines

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