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Electrical Machines

Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 11%
 21%
 10%
 41%

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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

 15.9 Ω
 31.1 Ω
 31.9 Ω
 15.1 Ω

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  magnetic inertia.
  high field resistance.
  residual flux.
  high speed.

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Electrical Machines
Wave winding is employed in DC machine of

 high current and low voltage rating.
 low current and low voltage rating.
 high current and low voltage rating.
  low current and high voltage rating.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 30 volts.
 20 volts.
 40 volts.
 10 volts.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  under commutation.
  too rapid reversal of current.
 over commutation.
  any of the above.

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