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Electrical Machines

Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 10V
 200V
 20V
 100V

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Electrical Machines
The primary and secondary windings of a transformer are

  inductively linked.
  conductively linked.
 electrically linked.
 mechanically linked.

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% decrease
 18.18% increase
 36.36% increase
 36.36% increase

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 0.5 at 90°C.
  1 at 90°C.
 2 at 90°C.
 3 at 90°C.

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

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

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = N1 / N2.
  E1 / E2 = 1.
  E1 / E2 = f1kw1 / f2kw2.

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