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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
 Silicon steel.
 Cast iron.
  Fibre.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 10 KW.
  2 KW.
 0.
 8 KW.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 963.8 r.p.m.
 1037.5 r.p.m.
 4575.4 r.p.m.
 1130 r.p.m.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting time.
 more starting torque.
 smoother acceleration.
 reduced starting current.

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with main poles
 parallel with armature
 parallel with main poles
 series with armature

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Series motor.
  Differential compound motor.
  Shunt motor.
  Cumulative compound motor.

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MORE MCQ ON Electrical Machines

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