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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 copper
 copper alloy
 brass
 hard-drawn copper

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the supply voltage and the back emf.
  magnetizing electric current and back emf.
None of these
  the rotating stator flux and rotor flux.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 230 V.
  222 V.
 225 V.
 220 V.

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 reduced size.
 low starting torque.
  quick acceleration.
 high efficiency.

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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

 31.1 Ω
 31.9 Ω
 15.1 Ω
 15.9 Ω

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the magnetizing current.
  reduce the chance of crawling.
  reduce the chance of cogging.
  increase the starting torque.

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MORE MCQ ON Electrical Machines

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