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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  15 %.
  2.5 %.
  20 %.
 10 %.

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  none of these.
  reversed.
  modified.
  increased.

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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

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

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 1, 3
 2, 3
 1, 4
 2, 4

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Electrical Machines
What are the starters used for starting of cage motors?

 DOL starter.
  All of these.
 Star-delta starter.
 Auto transformer starter.

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  cumulatively compounded.
  shunt connected.
 differentially compounded.
  separately excited.

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