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Electrical Machines

Electrical Machines
What is the highest possible speed of turbo alternators?

 1500 rpm
 4000 rpm
 1000 rpm
 3000 rpm

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 in reverse.
 to earth.
  to a DC source.
 to an AC source.

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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?

 950 rpm
 940 rpm
 1000 rpm
 975 rpm

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 large and thin
 large and thick
 less and thin

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Electrical Machines
Which of the following is/are not a self starting motor?

None of these
 3-phase induction motor
 both 1 and 2
 1-phase induction motor

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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
 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

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