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Electrical Machines

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

 Mild steel.
 Cast iron.
 Silicon steel.
  Fibre.

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  speed and voltage.
 speed.
  load.
  voltage.

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Electrical Machines
The reduced air gap results in an increase

  cost of operation.
  power factor.
  breaking torque.
  starting torque.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  500 to 720.
  1440 to 2880.
  720 to 920.
  375 to 500.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 0 KVA
 6 KVA
 4 KVA
 10 KVA

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

  (Pi / Pc)0.5 × Full Load.
 (Pi / Pc)2 × full Load.
 (Pi / Pc)1.6 × full Load.
 (Pi / Pc) × full Load.

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MORE MCQ ON Electrical Machines

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