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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

  1.5 to 2.
 3 to 5.
 2 to 3.
 1.0.

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Electrical Machines
Copper brushes in DC machine are used

 in both of above cases.
None of these
 where high voltage and low current.
 where low voltage and high currents are involved.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 200 V.
 150 V.
 300 V.
  223.V.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 350 V.
 400 V.
 420 V.
 480 V.

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Electrical Machines
The induction motor shaft is made of

  stainless steel.
  mild steel.
  aluminium.
  cast iron.

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
  2.73 KW.
 0.9103 KW.
 1.644 KW.

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