In a D.C. machine the number of brush arms is _________ the number of poles?

Related Mcqs:

The mcrease in heat dissipation by air blasts is due to increase in______________?

A. conduction B. convection E. radiation D. any ofthe above...

The resistivity of water should not be less than_____________?

A. 10 Q m B. 100 Q m C. 1000 Q m D. 2000 Q m...

When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of_____________?

A. short pitch B. full pitch C. either of the above D. none of the above...

In a D.C. machine, the value of peripheral speed should not, normally, exceed___________?

A. 10 m/s B. 20 m/s C. 30 m/s D. 40 m/s...

The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________?

A. 0.5 to 0.8 Wb/m2 B. 0.8 to 1.0 Wb/m2 C. 1.1 to 1.35 Wb/m2 D. 1.4 to 1.8 Wb/m2...