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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  1.
 0.7.
  0.54.
 0.3.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Cummulative compound motor.
 Shunt motor.
 Series motor.
 Differential compound motor.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 low slip region
 both 1 and 2
 high slip region
 unity slip

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 0°
 25° to 30°
 70° to 85°
 90°

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 differentially compounded motor
 series motor
 comulatively compounded motor
 permanent magnet motor

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  60 Hz.
  16.67 Hz.
  50 Hz.
  25 Hz.

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