The load sharing characteristics of two diesel generators operating in parallel are mostly dependent on their governor ______.

试卷相关题目

• 1While paralleling two AC generators using synchronizing(同步的) lamps only, both lamps will go dark when the generators are ______.

  A.running at the same speed

  B.grounded

  C.of the same polarity(极性)

  D.in phase

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• 2The 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

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• 3The current flowing first in one direction and then in another is called ____ current.

  A.a rush

  B.an alternating

  C.a direct

  D.an exciting

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• 4Hydraulic cranes must be properly warmed-up before being operated because ______.

  A.warm-up allows the hydraulic system to become charged with oil

  B.warm-up allows the relief valves to be properly tested

  C.hydraulic strainers operate only during the warm-up period

  D.hydraulic fluid must be at the proper viscosity

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• 5A mooring winch should be equipped with mechanical brakes capable of holding ______.

  A.half the breaking strength of the mooring line

  B.the full breaking strength of the mooring line

  C.the maximum expected tension(张力) of the mooring line

  D.50% over the working tension of the mooring line

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• 6Electric insulation is made of organic substances and so gradually ______with age.

  A.deteriorates

  B.increases

  C.are fouled

  D.becomes better

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• 7The main generators are connected to ______.

  A.distribution boards

  B.section boards

  C.emergency switch boards

  D.main switch boards

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• 8The operation of _____ two alternators requires the voltages to be equal and also in phase.

  A.control

  B.series-mounting

  C.running

  D.paralleling

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• 9______is a machine by which electrical energy is transformed into mechanical energy.

  A.An alternator

  B.An electric motor

  C.A diesel engine

  D.A main switchboard

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• 10A ground in an electrical circuit outside the engine room ______.

  A.cannot be detected under normal conditions

  B.is of no consequence to engineering personnel

  C.is indicated at the branch circuit breaker panel

  D.is indicated by the ground detecting lamps on the main switchboard

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