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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 increase
None of these
 either increase or decrease
 decrease

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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?

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

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 2000.
 500.
 1000.
 0.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Adding resistance to field circuit.
 Interchanging armature and field connection.
 Reversing supply connection.
 Reversing armature connection or field connection.

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 100 V.
 399 V.
 50 V.

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Cast iron bearings.
None of these
  Bush bearings.
  Ball bearings.

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MORE MCQ ON Electrical Machines

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