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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 80W
 100W
 40W
 60W

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  low starting torque.
  less costly motor is not required.
 power factor is less.
  high starting torque.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.56 %.
 2.57 %.
 3.76%.
 4.76%.

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Electrical Machines
For pure resistive load what is the armature reaction?

 magnetization
All of these
 demagnetization
 cross magnetization

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Electrical Machines
Which of the following represents the pitch factor?

 Cos α²
 sin (α/2)
 Cos α
 Cos (α/2)

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor field terminal.
 generator armature terminal.
 generator field terminal.
 motor armature terminal.

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