In case of D.C. machine winding, number of commutator segments is equal to______________?

Related Mcqs:

Copper brushes in D.C. machine are used_____________?

A. where low voltage and high currents are involved B. where high voltage and small cur-rents are involved C. in both of the above cases D. in none of the above cases...

The function of pole shoes in the case of D.C. machine is______________?

A. to reduce the reluctance of the mag¬netic path B. to spread out the flux to achieve uniform flux density C. to support the field coil D. to discharge all the above functions...

Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be_______________?

A. 2 : 3 B. 3 : 1 C. 3 : 2 D. 1 : 3...

Armature reaction in a generator results in_____________?

A. demagnetisation of leading pole tip and magnetisation of trailing pole tip B. demagnetisation of trailing pole tip and magnetisation of leading pole tip C. damagnetising the center of all poles D. magnetising the center of all poles...

The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?

A. will be less than 250 V B. will always be 250 V C. may be greater or less than 250 V D. none of the above...