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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 70° to 85°
 90°
 0°

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 shunt generator
 over compound generator
 both B and C

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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

 31.9 Ω
 15.9 Ω
 15.1 Ω
 31.1 Ω

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Electrical Machines
In shapers and slotters which motor are preferred?

  Synchronous motor.
  Double cage motor.
  Squirrel cage IM.
  Slip ring IM.

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and high reactance.
  low resistance and high reactance.
  high resistance and low reactance.
  low resistance and low reactance.

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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

 1.79 Ω
 3.1 Ω
 2 .1 Ω
 1.8 9 Ω

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