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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 wave winding
 lap winding
 both 1 and 2

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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 82.5%
 72.5%
 78.5%
 67.5%

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ra.
 E = V + Ia.
  E = V + IaRa.
 E = V – IaRa.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Ward Leonard control.
  None of above.
  Rheostatic control.
  Any of above method.

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Electrical Machines
Wave winding is prefered for which of the following rating?

 low current and low voltage
 low current and high voltage
 high current and low voltage
 high current and high voltage

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Electrical Machines
Which of the following is/are not a self starting motor?

 3-phase induction motor
 1-phase induction motor
None of these
 both 1 and 2

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