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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  aluminium.
  carbon.
  phosphor bronze.
  stainless steel.

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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 net voltage across the armature resistance at the time of plugging will be

 474 V
 240 V
 6 V
 234 V

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 increase.
 decrease.
None of these
 either of these.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T is independent of P.
 T2 ∝ P3.
 T ∝ P.
 T ∝ √P.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v.
 Blv.
 Bl2v2.
 Blv2.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 600 A.
 2400 A.
 1200 A.
  3600 A.

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