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Electrical Machines

Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 0.1 µF.
  2 - 3 µF.
  1 - 2 µF.
 5 - 10 F.

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Electrical Machines
In which of the following motors DC excitation is not required?

 reluctance motor
 3-phase synchronous generator
 hysteresis motor
 3-phase synchronous motor

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

 10 Ω
 100 Ω
 0.1 Ω
 50 Ω

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 copper loss
 iron loss
 mechanical loss
 both A and B

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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is

 1, 4
 2, 4
 1, 3
 2, 3

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

 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 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

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