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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 linearised
 hyperbola
 any of the above
 parabola

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Field excitaion.
  Armature current.
  Armature voltage.
  Supply voltage.

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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

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

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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
 60W
 40W
 100W

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Electrical Machines
Reactive power generated or delivered significantly depends on

 excitation.
 both 1 and 2.
 load angle.
 frequency.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 opposite to the direction of motion of the conductor.
 direction of induced emf.
 direction of flux.
 direction of motion of the conductor.

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MORE MCQ ON Electrical Machines

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