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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 positive.
  zero.
 low.
 negative.

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Electrical Machines
which of the following type of brush and their application is/are correct

 copper graphite → low voltage high current density
All of these
 carbon brush → normal ratings
 electro graphite → large ratings

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 load angle
 excitation
 synchronous reactance
 both 1and 2

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T ∝ 1/V
 T∝ V²
 T ∝ 1/V²

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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

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

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 field winding will burn.
 the voltage generated will be zero.
 machine will generate maximum voltage.
 machine will generate maximum power.

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