Commercial available medium size machines have a speed range of ______ .
A. 200 to 400 r.p.m.
B. 600 to 1000 r.p.m.
C. 1000 to 1500 r.p.m.
D. 2000 to 2500 r.p.m.
Answer: Option D
This Question Belongs to Electrical Engineering >> Electrical Machine Design
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
_________ electromagnets generally function as holding magnets.
A. Tractive
B. Portative
C. Either of the above
D. None 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
In direct cooled system using hydrogen both stator and rotor conductors are made
A. solid
B. hollow
C. perforated
D. any ofthe above
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