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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 3
 1/3
 1/√3

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Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Mild steel.
 Fibre.
 Cast iron.

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Electrical Machines
Damper winding is used to

 decrease the load current.
 suppress the hunting.
 both 1 and 2.
 increase the load current.

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

 Line voltage.
 Rotor current.
 Slip.
 Running torque.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 2.2 ohms.
 5.7 ohms.
 1.9 ohms.
 6 ohms.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the source frequency.
 increase the number of turns in armature coil.
 increase the number of turns in field coil.
  increase the speed of shaft rotation.

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