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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
 about 115°.
  about 75°.
 0°.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 2 alone
 1 and 3
 1, 2 and 3
 1 and 2

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 somewhat less than 220 V
 more than 220 V
 220 V
 6 V

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.57 %.
 4.76%.
 3.76%.
 2.56 %.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

None of these
  3.33 %.
 0 .001 %.
 3 %.

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Electrical Machines
An induction motor is, in general analogous to

None of these
 two winding transformer with secondary short circuited.
 auto transformer.
 two winding transformer with secondary open circuited.

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