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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 100 Ω
 50 Ω
 0.1 Ω
 10 Ω

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

  more than core loss.
 equal to core loss.
 zero.
 less than core loss.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

 Capacitor start.
  Capacitor run type.
 Split phase type.
 Shaded pole type.

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Electrical Machines
The functions of inter poles are

 both 1 and 2
 nullify reactance voltage and improve the commutation.
 reduce cross magnetization effect and improve commutation
None of these

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 3Fmax.
 (1/2)Fmax.
 Fmax.
  (3/2)Fmax.

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 2 at 90°C.
 3 at 90°C.
 0.5 at 90°C.
  1 at 90°C.

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