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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.512.
 0.649.
 0.443.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very low.
 Zero.
 Normal.
 Very high.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 none of above
 both A and B
 shunt field
 armature circuit

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

 shunt generator
 series generators
 over compound generator
 both B and C

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

All of these
 In order to get more flux.
 In order to not to get saturated.
 In order to get saturated.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 synchronous reactance
 excitation
 both 1and 2
 load angle

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