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Electrical Machines

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

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

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 40 V
 zero
 20 V
 50 V

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 A modulated supply frequency AC voltage with slip frequency envelop.
 AC of supply frequency.
  DC of slip frequency.
 DC.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Line current.
 Armature current.
 None of above.
 Field current.

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Electrical Machines
Induction motor operation depends on

 either of these.
 rotating magnetic field.
 stationary magnetic field.
None of these

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