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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC motor
 induction motor
 AC generator
 DC generator

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Electrical Machines
Armature reaction depends on which of the following?

 both 1 and 2
 magnitude of load current
None of these
 power factor of load

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

  Increases.
 Remains unchanged.
 None of above.
 Decreases.

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 DC.
 AC of supply frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.
  DC of slip frequency.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 266.20 N-m.
 cant be determined.
 234.76 N-m.
 133.22 N-m

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