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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 1.5 %.
 4 %.
  less than 1 %.
  zero.

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its power factor will reduce
 its speed will increase
 its speed will reduce
 its efficiency will improve

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
Armature of DC machine is made of

 conducting material.
 silicon steel.
 non-ferrous material.
 insulating material.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/3
 1/3, 1/√3
 1/√3, 1/3
 1/√3, 1/√3

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Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  carbon.
  stainless steel.
  aluminium.

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