__________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?

Related Mcqs:

Electrical machines having power outputs ranging from a few kW up to approximately 250 kW may be classified as_____________?

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

cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?

A. Direct B. Indirect C. Conventional D. Any of the above...

By which of the following methods motor rating for variable load drives can be determined ?

A. Method of average losses B. Equivalent current method C. Equivalent torque method D. Equivalent power method E. All of the above...

D.C. machines designed with a large value of air gap length have_____________?

A. worst, ventilation B. poor ventilation C. better ventilation D. none of the above...

The insulation between windings and grounded core and the insulation between the windings of the same phase is called__________________?

A. minor insulation B. major insulation C. either of the above D. none of the above...