單項選擇題

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

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單項選擇題

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

單項選擇題

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

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