In ______________ the speed can be varied by changing the position of brushes?

Related Mcqs:

The selection of an electric motor for any application depends on which of the following factors ?

A. Electrical characteristics B. Mechanical characteristics C. Size and rating of motors D. Cost E. All of the above...

Which of the following is essentially needed while selecting a motor ?

A. Pulley B. Starter C. Foundation pedal D. Bearings...

Flame proof motors are used in_________________?

A. paper mills B. steel mills C. moist atmospheres D. explosive atmospheres...

Heavy duty cranes are used in________________?

A. ore handling plants B. steel plants C. heavy engineering workshops D. all of the above...

By the use of which of the following m D.C. can be obtained from AC. ?

A. Silicon diodes B. Mercury arc rectifier C. Motor generator set D. Any of the above...