Wattmeter cannot be designed on the principle of
A. electrostatic instrument
B. thermocouple instrument
C. moving iron instrument
D. electrodynamic instrument
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
A wattmeter cannot be designed on the principle of a moving iron instrument because it can only measure current and voltage, not power.