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Electrical Machines

Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  s2.
  sf.
  sf / 2.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1/S
 2-S
 1-S
 S

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/ 4Sa
 PZL/4S
 PZL/4SP²
 PZL/4Sa²

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 closed winding
 wave winding
 open type winding
 lap winding

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase gradually and then stay at rated voltage
 increase to rated voltage and then may decrease
 decrease
 remain nearly constant

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.1 Ω
 15.9 Ω
 31.1 Ω
 31.9 Ω

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