单项选择题
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
When securing an AC generator, you should FIRST （）.A.op...
单项选择题When securing an AC generator, you should FIRST （）.
A.open the generator circuit breaker B.switch the voltage regulator to “manual” C.decrease the field excitation to minimum D.reduce the load on the unit
