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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Normal.
 Very low.
 Very high.
 Zero.

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Electrical Machines
The type of DC motor used for shears and punches is

 Series motor.
 Differential compound motor.
 Shunt motor.
  Cummulative compound motor.

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Electrical Machines
In a DC Motor 3 point starter is used to

 limit the starting current to a safer value.
 all of above.
 provide overload protection.
 provide protection against Low-Voltage.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 cant be determined.
 133.22 N-m
 266.20 N-m.
 234.76 N-m.

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  high starting torque.
  low starting torque.
 power factor is less.
  less costly motor is not required.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.5 p.u
  0.25 p.u
  0.75 p.u
  0.125 p.u

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MORE MCQ ON Electrical Machines

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