单项选择题
A.increase the field excitation B.decrease the field excitation C.increase the number of magnetic poles D.increase the speed of the prime mover
When measuring AC current flow, you must always connect...
单项选择题When measuring AC current flow, you must always connect the meter （）
A.in series with the power source and load B.in parallel with the power source and load C.insuring correct polarity D.using the lowest range possible to prevent instrument damage
The frequency of an AC generator is adjusted by means o...
单项选择题The frequency of an AC generator is adjusted by means of the （）
A.main alternator field rheostat B.exciter field rheostat C.prime mover governor control D.equalizing reactor
When the current flow through a copper wire increases, ...
单项选择题When the current flow through a copper wire increases, its （）
A.resistance will decrease B.insulation will bum C.temperature will increase D.conductivity will increase
