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Electrical Machines

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

 remains constant.
 decreases
 decreases.
 increases.

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Electrical Machines
For standing a DC motor a starter is required because

  It starts the motor.
None of these
  it limits the starting current to a safe value.
  it limits the speed of the motor.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of flux.
 direction of induced emf.
 direction of motion of the conductor.
 opposite to the direction of motion of the conductor.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will become slow.
 motor will not run.
  It will run in opposite direction.
 It will run in same direction.

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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
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.04, 1.96
 0.04, 0.96
 0.02, 1.98

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