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Electrical Machines

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

 20KVA
 16KVA
 4KVA
 0KVA

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 N1 : N2.
 1 : 1.
 none.
 N12 : N22.

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 pulsating and unidirectional
None of these
 steady and unidirectional
 oscillating

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  mechanical losses.
  ohmic losses.
  eddy current losses.
  hysteresis losses.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 over compound generator
 shunt generator
 series generators
 both B and C

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
  copper loss at any load.
 copper loss at over load.
 copper loss at half load.

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