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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 940 rpm
 975 rpm
 950 rpm
 1000 rpm

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 any of the above
 increases
 remains unaffected
 decreases

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Electrical Machines
In double cage induction motor, the outer cage offers

  high resistance and high reactance.
  high resistance and low reactance.
  low resistance and high reactance.
  low resistance and low reactance.

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  none.
  larger output.
  both.

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  reduce copper loss.
  improve efficiency.
  improve power factor.
  improve starting torque.

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

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

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