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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - delta
 Star - star
 Delta - delta
 Delta - star

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 mechanical rotatory system.
  restoring torque.
 damping torque.
 synchronizing power co efficient.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 2
 1, 2 and 3
 1 and 3
 2 alone

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Zero
None of these
 Slip speed
 Synchronous speed

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Fleming's right hand rule.
 Fleming's left hand rule.
 Ampere law.
 Lenz's law.

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ φf
 E ∝ φ/f
 E ∝ 1/(φf)
 E ∝ f/φ

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