单项选择题

The power factor of an AC generator operating singularly is determined by the （）

A.connected load
B.prime mover speed
C.field excitation
D.generators rated voltage

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单项选择题

The resistance of electric wire will decrease as its （）

A.length increases
B.cross-sectional area increases
C.temperature increases
D.percent of metallic purities increases

单项选择题

The total power consumed in a parallel circuit is （）

A.the sum of the powers used in each load (resistor)
B.divided by the number of loads
C.always less than the power used in the smallest load
D.the sum of the powers used in each individual load never more than the power used in the largest load

单项选择题

Current measuring instruments must always be connected in （）

A.series with a circuit
B.parallel with a circuit
C.series-parallel with a circuit
D.delta with the shunt