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Electrical Machines

Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs load current
 Vt vs load current
 Eg vs Ia
 Vt vs Ia

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide protection against Low-Voltage.
 limit the starting current to a safer value.
 provide overload protection.
 all of above.

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the polar axis.
 commutator in the inter polar axis.
 armature midway between poles.
 armature in the polar axis.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
  1.
 0.3.
 0.7.

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 2 and 3
 1 alone
 1 and 3
 1 and 2

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 power due to saliency or reluctance only
None of these
 both 1 and 2
 excitation power only

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