Q. PMDC motor offers ___________

View solution

Q. PMDC motors are _________________

View solution

Q. In PMDC magnetic material is placed instead of _____________

View solution

Q. In PMDC motors we use magnetic material with ___________

View solution

Q. DC generators are disconnected/connected from/to the busbars only under the floating condition because ____________

View solution

Q. How many poles to be used in DC machine if brushes are placed 4 commutator segments apart for 16 commutator segments?

View solution

Q. Specific resistance for a brush is given by _________

View solution

Q. What is the range of the brush friction coefficients for medium category?

View solution

Q. Spacing between the brushes for a 4-pole machine in terms of commutator segments is equal to 6. What will be the number of armature slots?

View solution

Q. Spacing between the brushes for a 4-pole machine in terms of commutator segments for 12 conductor segments is _____

View solution

Q. For both lap and wave windings, what is the number of commutator bars equal to?

View solution

Q. Reason behind the rapid wear of brushes is __________

View solution

Q. How to avoid grooves in the commutation of DC machine with the help of brush?

View solution

Q. What is the requirement of the good commutation?

View solution

Q. The drop in the voltage for which of the following types of brush can be expected to be least?

View solution

Q. In a DC generator the ripples in the direct emf generated can be reduced by________

View solution

Q. How total number of brushes in a commutator are determined in a given DC machine?

View solution

Q. In case of DC machine winding, number of commutator segments is equal to ______

View solution

Q. Which conductors are in point of contact with brushes?

View solution

Q. What are the number of the brushes in the wave winding?

View solution