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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 decreases.
 increases.
 remains constant.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a almost constant speed.
 Can be started easily without load.
 Has a poor torque.
 Has its field winding consinting of thick wire and less no of turns.

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Electrical Machines
DC series motor is best suited for electric traction as

 It runs at very high speed at light load.
 It is cheaper in cost.
  It develops high starting torque.
 It consume less power.

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

  0.54 Ω.
 0.06 Ω.
 0.54 Ω.
 0.01 Ω.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running current.
  efficiency.
  ratio of starting to running torque.
  ratio of input to output voltage.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To convert alternating supply current to direct current.
  None of these.
  To absorb the mechanical shocks produced during running condition.
  To increase the flux cutting by the rotor.

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