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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
 Induction machine
All of these
 DC machine

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Electrical Machines
In an auto-transformer, power is transferred through

 both A and B.
None of these
 conduction process only.
 induction process only.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 and 2
 4 ang 1
 2 and 1
 2 and 2

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the electrical resistivity of iron.
  increases the hysteresis loss.
  reduces the saturation magnetization.
None of these

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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?

 940 rpm
 1000 rpm
 950 rpm
 975 rpm

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Electrical Machines
When a DC cummulative compound wound motor is loaded

  Torque increase and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.
 Both torque and speed decrease.

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