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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 increases.
 remains constant.
 decreases.
 decreases

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

 both 1 and 2
 lap winding
 wave winding
None of these

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Series motor.
  Shunt motor.
  Cumulative compound motor.
  Differential compound motor.

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Electrical Machines
The three point starter is used for

  Shunt motor.
  Shunt motor as well as compound motors.
  Series motor.
  Shunt, compound and series motor.

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Electrical Machines
Induction motors have the advantage of

  less maintenance.
  simple in construction.
  all of below.
  less cost.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012

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