Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the motor will come to stop.
 the motor will attain dangerously high speed.
 the speed of motor will be reduced.
 the armature current will reduce.

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Electrical Machines
For an ideal transformer the winding should have

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

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Electrical Machines
Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes :

 1 and 3
 1, 2, and 3
 2, 3 and 4
 1, 2 and 4

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