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Electrical Machines

Electrical Machines
Eddy current loss will depends on

All of these
 Frequency
 Thickness
 Flux density

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Electrical Machines
The frame of an induction motor is made of

  aluminium.
  closed grained cast iron.
  stainless steel.
  silicon steel.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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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

 Pi/Pc
 √(Pi/Pc)
 (Pi/Pc)2
 Pc/Pi

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia increases and ωm decreses
 both armature current Ia and speed ωm increase
 both decrese
 Ia remains constant but ωm increase

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 40 volts.
 10 volts.
 30 volts.
 20 volts.

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