An induction wattmeter can be used for
A. both D.C. and A.C.
B. D.C. only
C. A.C. only
D. any of the above
Answer: Option C
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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
It's work only on AC supply.
I have a doubt... All induction type instrument works only in AC... How induction type wattmeter can be used for DC??