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Electrical Machines

Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 2
 2 and 1
 4 ang 1
 4 and 2

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 parallel with main poles
 parallel with armature
 series with main poles
 series with armature

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

None of these
 I1 > I2
 I1 = I2
 I1 < I2

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 133.22 N-m
 234.76 N-m.
 cant be determined.
 266.20 N-m.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 Greater than 90o.
 less than 90o.
 90o.
 0o.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 44 A.
  40 A.
 400 A.
 440 A.

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