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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 both B and C
 cumulative compound motors
 shunt motors
 series motors

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 280 V.
 220 V.
 240 V.
 150 V.

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

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

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Electrical Machines
Which of the following is/are effects of armature reaction?

All of these
 increase the maintenance and repair
 increases the design cost
 increase the iron loss

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  2.
  data provided is insufficient.
  4.
 6.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 440 A.
 570 A.
 340 A.
 250 A.

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