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Electrical Machines

Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 200V
 20V
 10V
 100V

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Electrical Machines
Resistance commutation is used generally in case of

  fractional kW DC machines.
None of these
 DC machines bellow 5 kW.
 DC machines above 10 kW.

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

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

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 0KVA
 4KVA
 20KVA
 16KVA

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 0°.
 30°.
  75°.
 45°.

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 both Eb and Td are unchanged
 Eb is unchanged, but Td is zero
 Eb is zero, but Td is unchanged
 both Eb and Td are zero

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