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ELECTRICAL MACHINES

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

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

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Electrical Machines
It is advisable to start a DC series motor with some load to

  Limit the speed.
 Limit the current.
 Avoid sparking.
 Limit the flux.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Series.
 none of these.
  Shunt.
 Compound (cummolative).

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 have an equal number of electrons and protons.
 Series shunt.
 Cummulative compound.
  Differentical compound.

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Differentical compound.
  Series.
 Cummulative compound.
 Shunt.

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