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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 mica.
  carbon.
 copper.
 cast iron.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.
 either of these.
 field current on Y-axis and armature current on X-axis.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 1.8 9 Ω
 1.79 Ω
 3.1 Ω

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 2 / 3.
 6 / 7.
  4 / 5.
 5 / 6.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

None of these
 same in both methods
 field weakening method
 armature resistance control

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T∝ V²
 T ∝ 1/V
 T ∝ 1/V²

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