Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

 44.47 Amp.
  33.33 Amp.
 29 Amp.
  43 Amp.

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Electrical Machines
In a step down transformer which one of the following statements is true?

 Number of secondary turns is more than that of primary.
 Secondary power is less than primary power.
  Number of secondary turns is less than primary turns.
 Secondary current is less than primary current.

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Electrical Machines
For an ideal transformer the winding should have

 no ohmic resistance on either side
 equal resistance on primary and secondary side
 maximum resistance on primary side and least resistance on secondary side
 minimum resistance on primary side and maximum resistance on secondary side

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