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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 0.9103 KW.
 1.644 KW.
 5.46 KW.
  2.73 KW.

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

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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

  0.23Ω.
 0.5Ω.
 0.25Ω.
 1Ω.

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Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
  maximum value.
 average value.
 total value.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thin
 large and thin
 less and thick
 large and thick

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 1/√3
 3
 1/3

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