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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/S
 1/(1-S)
 S
 1-S

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 none of above.
 1130 r.p.m.
 1037.5 r.p.m.
 4575.4 r.p.m.

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

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

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 4 point starter
 3 point starter
All of these
 2 point starter

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 660
 40
 600
 60

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant power control
 constant voltage control
 constant torque control
 constant current control

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