In D.C. machines the number of slots per pole usually lies___________?

Related Mcqs:

Electrical machines having a power output up to about 750 W may be called__________machines?

A. small size B. medium size C. large size D. any of the above...

Which of the following is an advantage of hydrogen cooling ?

A. Increase in efficiency B. Increase in ratings C. Increase in life D. Smaller size of coolers E. All of the above...

By which of the following methods the temperature rise of windings and other parts may be determined ?

A. Thermometer method B. Resistance method C. Embedded temperature detector method D. Any 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...

___________ brushes are fragile and cause excessive wear of commutator?

A. Natural graphite B. Hard carbon C. Electro graphitic D. Metal graphite...