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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 AC generator
 induction motor
 DC motor
 DC generator

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

  Conveyers.
 Centrifugal pumps.
 Blowers.
 Air compressors.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 50 V.
 399 V.
 100 V.
  230.2 V.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 V²
 f²
 V

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Electrical Machines
Commutators in DC machines have a role of which converts

 Both AC to DC and DC to AC.
 none of these.
 high voltage DC to low voltage DC.
 AC to DC.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same phase sequence
 same prime mover speed
 same voltage magnitude
 same frequency

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