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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 mechanical loss
 both A and B
 copper loss
 iron loss

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 24
 10
 5
 12

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Electrical Machines
Resistance commutation is used generally in case of

 DC machines bellow 5 kW.
  fractional kW DC machines.
 DC machines above 10 kW.
None of these

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and load
 supply voltage, frequency and load
 supply voltage
 supply voltage and frequency

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Line voltage.
 Running torque.
 Slip.
 Rotor current.

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Electrical Machines
Armature of DC machine is made of

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

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