單項(xiàng)選擇題The division of kilowatt load between two paralleled alternators is determined by the （）

A.amount of field excitation of the leading machine
B.load-speed characteristics of the governors
C.amount of field excitation to the lagging machine
D.type of alternator


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1.單項(xiàng)選擇題The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the （）.

A.voltage regulators
B.field rheostats
C.reverse power relays
D.prime mover governors

2.單項(xiàng)選擇題In a three-phase circuit, the phase voltages are （）

A.120°apart
B.160°apart
C.180°apart
D.360°apart

3.單項(xiàng)選擇題The frequency of an alternator at a given RPM is determined by the （）.

A.number of turns of wire in the armature coil
B.number of magnetic poles
C.strength of the magnets used
D.output voltage

4.單項(xiàng)選擇題The pushbutton on the handset of a ships sound-powered telephone must be depressed to （）.

A.talk then released to listen
B.listen then released to talk
C.both talk and listen
D.ring the station being called

5.單項(xiàng)選擇題Which of the following statements is true concerning simple parallel resistance circuits?（）

A.The total current flow equals the sum of the individual currents
B.The total current flow equals the reciprocal of the sum of the individual currents
C.The total resistance equals the sum of the individual resistance
D.The total voltage equals the sum of the individual voltages across each resistance