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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  high.
  low.
  medium.
  zero.

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 15.28 Nm
 15.6 Nm
 16.55 Nm
 15.92 Nm

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 rheostatic control.
 Ward Leonard control.
 any of above method.
 none of above.

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Electrical Machines
Which of the following relation is correct?

 Xd = Xq.
 Xd < Xq.
None of these
 Xd > Xq.

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

 Split phase motor.
  PSC (permanent split capacitor) motor.
 Shaded pole motor.
None of these

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Electrical Machines
Which type of motors uses slip rings?

 Both Synchronous and Induction motor
 DC Shunt Motor
 Induction motors
 Synchronous motors

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