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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  zero.
  medium.
  low.
  high.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 Greater than 1.
 0.5.
 near to 1.
 0.25.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 50Ω
 200Ω
 10Ω
 100Ω

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Electrical Machines
Methods of synchronizing of alternator may be done by

  all of these.
 all bright lamp method.
 one dark two bright.
 all dark lamp method.

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Electrical Machines
The material used for commutator brushes is mostly

 mica.
 cast iron.
 copper.
  carbon.

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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

 240 V
 474 V
 234 V
 6 V

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