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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 0 Hz
 100 Hz
 50 Hz

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Electrical Machines
Conservator tank is used

 for better cooling of transformer.
 to act as an oil storage.
 to take up the expansion of oil due to temperature rise.
None of these

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Electrical Machines
Hunting in a synchronous motor takes place

  when load varies.
  when power factor is unity.
  motor is under loaded.
  when supply voltage fluctuates.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 60, 1440.
 50, 1500.
 1440, 1500.
  60, 1500.

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Electrical Machines
The ventilating ducts in most of DC machine are

 radial as well as longitudinal.
 longitudinal.
 none of these.
 radial.

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant torque control
 constant voltage control
 constant current control
 constant power control

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