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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 0
 1
 infinite value
 finite value

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

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

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

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

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 72°
 30°
 18°

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 963.8 r.p.m.
 1130 r.p.m.
 1037.5 r.p.m.
 4575.4 r.p.m.

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Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 0.5 lagging
 R = S.X
 zero
 unity

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MORE MCQ ON Electrical Machines

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