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Electrical Machines

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

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

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 armature circuit
 shunt field
 both A and B
 none of above

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 core losses.
 copper losses.
 dielectric losses.
 stray losses.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 lagging
 leading
 unity
 zero

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

All of these
 armature current
 armature mmf
 armature flux

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 18.25%.
 16.67%.
 14.28%.
 15.30%.

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