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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  make noise.
  not run.
  get over heated.

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Electrical Machines
Demagnetization effects which of the following?

 reduction in main field flux
 both B and C
 commutation
 reduces the terminal voltage

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

  Kef2Kf2Bm2.
 KefKf2Bm2.
 Kef2KfBm2.
 Kef2Kf2Bm.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
 No load.
  Full load.
 None of these.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 27 A.
  13.5 A.
 23 A.
 11.5 A.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.25Ω.
 0.5Ω.
 1Ω.
  0.23Ω.

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