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Electrical Machines

Electrical Machines
In escalator which motor is used?

  1 - φ IM.
  Universal motor.
  3 - φ IM.
  DC shunt motor.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  decreases.
  increases upto a limit and then remains almost constant.
  remains constant.
 increases.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = ωm
 ωe = 2*ωm
 ωe = 4*ωm
 ωe = 1/2*ωm

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cosδ
 sinδ
 sin2δ
 cos2δ

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Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
 Both type rotor.
None of these
 Cylindrical rotor.

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Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 both 1 and 2
 wave winding
 lap winding

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