單項(xiàng)選擇題An operational amplifier, as used in todays consoles, may have a calculated gain of 5√This means that as the input changes by （）

A.1 volt, the output changes 5 volts
B.5 volts, the output changes 1 volt
C.5 volts, the output changes 10 volts
D.10 volts, the output changes 5 volts


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1.單項(xiàng)選擇題Why is it desirable to operate paralleled AC generators at the same power factor?（）

A.Circulating currents are kept to a minimum
B.Field excitation losses are kept to a minimum
C.Generator rotors will have a lesser tendency to hunt
D.Because a power factor increase will decrease kilowatt output

2.單項(xiàng)選擇題An ammeter should be used to measure （）

A.the voltage between two points in a circuit
B.circuit continuity
C.current flow in a circuit
D.total or partial circuit resistance

3.單項(xiàng)選擇題When the voltage remains constant and the resistance is increased in a series circuit, the flow of current （）

A.increases by the square of the original value
B.increases
C.remains the same
D.decreases

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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