Q. To achieve spark less commutation brushes of a DC generator are placed ________

View solution

Q. If in the DC machine, the reversal of current in the coil is faster than ideal or linear commutation then the commutation is said to be __________ commutation.

View solution

Q. For a DC machine, in a commutator ________

View solution

Q. The insulating material used between the commutator segments is normally _______

View solution

Q. Why interpoles are tapered in a DC machine?

View solution

Q. The main function of interpoles in a loaded DC machine is to minimize _______between the brushes and the commutator.

View solution

Q. Which of the following is different component?

View solution

Q. How many coils under an adjoining pole pairs is/are connected between adjacent commutator segments in lap winding?

View solution

Q. In wave winding, P/2 coils are connected under the influence of “x” pole-pairs which connect adjacent segments. X is ____

View solution

Q. The process of current reversal takes place when the coil is passing through the interpolar region.

View solution

Q. How many coil sets undergo commutation simultaneously in a wave winding?

View solution

Q. Which coil is shorted in commutation process?

View solution

Q. Ideal commutation can be shown graphically by _____________

View solution

Q. Which winding has large number of turns?

View solution

Q. Which winding contains wire with higher thickness?

View solution

Q. Which winding have higher resistance?

View solution

Q. Which is more practical method used in control of series field?

View solution

Q. In compound excitation, which winding/s is/are excited?

View solution

Q. In which type of excitation air gap flux increases with armature current?

View solution

Q. In differential compound excited machine, what is the variation in air gap flux per pole with respect to armature current?

View solution