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Electrical Machines

Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
None of these
 decrease
 increase

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Electrical Machines
The rotor speed of an induction motor is given by

  Ns = 120f /p × ( 1 - r).
  Ns = 120f / p × ( 1 - s ).
None of these
  Nr = 120f / p × (1-s).

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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 ?

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

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Over-excitation.
  Small and constant load.
  Periodic variation of load.
  Over-loading for long period.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia remains constant but ωm increase
 Ia increases and ωm decreses
 both decrese
 both armature current Ia and speed ωm increase

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Electrical Machines
The primary and secondary windings of a transformer are

 electrically linked.
 mechanically linked.
  inductively linked.
  conductively linked.

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