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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa.
  EbIa2.
  none of these.
  EIa.

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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

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

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.75 p.u
  0.5 p.u
  0.125 p.u
  0.25 p.u

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has its field winding consinting of thick wire and less no of turns.
 Has a poor torque.
 Can be started easily without load.
 Has a almost constant speed.

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 0.5 at 90°C.
 3 at 90°C.
  1 at 90°C.
 2 at 90°C.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both decrease
 both increase
 increase and decrease respectively
 decrease and increase respectively

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