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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

  All of this.
 Lathes.
 Blowers and fans.
 Centrifugal pumps

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 Pc/Pi
 (Pi/Pc)2
 √(Pi/Pc)
 Pi/Pc

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  both.
  larger bore diameter.
  larger output.
  none.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 DC Shunt Motor
  The motor will attain dangerously high speed.
 The armature current will reduce.
 The speed of motor will be reduced.

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Electrical Machines
Alternator operates on the principle of

  electromagnetic induction.
  self or mutual induction.
  mutual induction.
  self induction.

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Electrical Machines
In case of IM the torque is

  inversely proportional to √slip.
  directly proportional to slip2.
  inversely proportional to slip.
  directly proportional to slip.

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MORE MCQ ON Electrical Machines

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