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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
None of these
 decrease
 increase

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Electrical Machines
Damper winding is used to

 decrease the load current.
 suppress the hunting.
 both 1 and 2.
 increase the load current.

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux weakens the main field flux.
  Both option B and C.
 None of the options.
 Armature flux distorts the main field flux.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T∝ V²
 T ∝ 1/V²
 T ∝ 1/V

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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?

 1500.
 1450.
 1440.
  1435.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Universal motors.
  Induction motors.
  Reluctance motors.
  Stepper motors.

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