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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 co- sinusoidal
 flat-topped
 sinusoidal

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Electrical Machines
The armature shaft must be able to withstand

 any unbalanced magnetic pull on the armature core.
 bending moment due to weight of the armature.
All of these
 twisting strains due to transmission of torque.

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Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
 cooling.
 lubrication.
  insulating.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  greater than one.
  less than one.
  very low
  approx to one.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1000
 1203
 1080
 1200

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Electrical Machines
Slip rings of an induction motors are made of

  aluminium.
  carbon.
  phosphor bronze.
  stainless steel.

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MORE MCQ ON Electrical Machines

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