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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2.5Hz
 2HZ
 50Hz
 1 Hz

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
 to avoid over heating.
 to avoid locking of the armature.
All of these

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 ohms.
 2.2 ohms.
 6 ohms.
 1.9 ohms.

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Electrical Machines
The polarity of a DC generator can be reversed by

 reversing field electric current as well as direction of rotation.
 increasing field current.
 any of above.
 reversing the field current.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Universal motor.
  Slip ring induction motor.
  Reluctance motor.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1000
 1080
 1200
 1203

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