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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Delta - delta
 Star - delta
 Star - star

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 2, 3, 4
 1, 3, 5
 1, 2, 3, 4
 1, 2, 5

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

All of these
 In order to get more flux.
 In order to not to get saturated.
 In order to get saturated.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 51.5Hz
 48.5Hz
 1.5Hz
 2.5Hz

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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 78.5%
 82.5%
 72.5%
 67.5%

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 210 V
 150 V.
 230 V.
 240 V.

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