Q. Axis undergo shifting as a result of armature reaction, can be balanced by ______

View solution

Q. Each of the following statements regarding interpoles is true except______________________

View solution

Q. The most likely cause(s) of sparking at the brushes in a DC machine is /are ____________

View solution

Q. Why dummy coils are connected in DC machine?

View solution

Q. Function of interpole flux is_________

View solution

Q. Exact purpose of compensating winding in a DC generator is _________

View solution

Q. What is the exact location of compensating winding?

View solution

Q. Which of the following method will completely neutralize the armature reaction in a DC machine?

View solution

Q. Inequality in brush arm currents caused due to different emf induced in different parallel paths may give rise to copper losses. These effects can be avoided by using _________

View solution

Q. Where are no equalizer rings connected?

View solution

Q. What is the ampere turns per pole for compensating winding in DC machines?

View solution

Q. In order to neutralize armature mmf perfectly under the pole shoe, the ampere-conductors of compensating winding must be (pole arc/pole pitch=1) _______

View solution

Q. The armature reaction in a DC machine causes distortion in the main field flux. Effect of armature reaction can be reduced by_________

View solution

Q. For 6252 AT/Poles, if brush shift is of 2.50 mech. Degrees, what will be the cross-magnetizing ampere-turns per pole for a 6-pole DC machine?

View solution

Q. For 6252 AT/Poles, if brush shift is of 2.50 mech. Degrees, what will be the demagnetizing ampere-turns per pole for a 6-pole DC machine?

View solution

Q. What is the total ampere turns per pole for 720 lap wounded conductors with carrying armature current equal to 625 A in a 6-pole machine?

View solution

Q. If total ampere turns per pole is equal to 6000 A-turns, peak ampere turns for a 4-pole machine is _____

View solution

Q. What is the total ampere turns/pole (in AT/pole) if 600 lap wound conductors carry 120 A current through conductors (P=4)?

View solution

Q. What is the total ampere conductors/pole (in SI) if 600 lap wound conductors carry 120 A current through conductors (P=4)?

View solution

Q. A 250 kW, 400 V, 6-pole dc generator has 720 lap wound conductors. Armature current is ____

View solution