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Electrical Machines

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

 0°
 25° to 30°
 90°
 70° to 85°

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Compound.
 None of the options.
  Series.
 Parallel.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 less and maximum torque decreases
 more and maximum torque decreases
 more and maximum torque remains constant

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 14 HP.
  10 HP.
  13 HP.
 15 HP.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia
 I/Ia2
 Ia2
 1/Ia

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the motor will attain dangerously high speed.
 the armature current will reduce.
 the motor will come to stop.
 the speed of motor will be reduced.

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