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Electrical Machines

Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
 rotor reactance X
None of these
 rotor resistance R

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to the square of armature current.
 Inversely proportional to armature current.
 Proportional to armature current.
  Constant.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 Greater than 90o.
 less than 90o.
 90o.
 0o.

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Electrical Machines
Poles of DC machine are often laminated to

 dissipate more heat.
 reduce armature reaction.
 reduce pulsation loss.
 reduce iron weight.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 low slip region
 both 1 and 2
 unity slip
 high slip region

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Applied voltage.
 All of these.
 Field flux.
 Armature current.

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