A、A.90~0 kw
B、B.127~27 kw
C、C.155~70 kw
D、D.194~85 kw
更多“A three-phase alternator operates at 450 volts with a power factor of 0~8.If the ammeter indicates 250 amperes, what should be the KW meter reading （）.”相关的问题
A、Each has three separate but identical armature windings acted on by one system of rotating magnets B、Each has one armature winding acted on by three identical but separate systems of rotating magnets C、All three-phase alternators are designed to operate with a O8 leading power factor D、The three phases always provide power to the load through three sets of slip rings and brushes
A、A.AC voltage to the armature B、B.AC voltage to the field C、C.DC voltage to the armature D、D.DC voltage to the field
A、both generate alternating voltages B、both rectify the voltage before delivery C、are constructed at the same physical size for the same kilowatt rating D、both supply three-phase power
A、The generator needs not excitation B、The winding on the rotor is for inputting excitation current C、There are three phase windings on the rotor D、The generator has brushes
A、The alternators are not generating the same voltages and should be adjusted on automatic voltage regulator rheostats B、Alternator frequencies are different and should be adjusted on the governor speed controllers C、Alternators are out of phase and should be tripped and paralleled again D、One alternator has lost one of its phases
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