Camshafts are usually driven by timing gears or  ______.

试卷相关题目

• 1Always ensure that the turning gear is______, even at the quay, the wave from other ships may turn the propeller and thus the engine.

  A.disengaged

  B.engaged

  C.assembled

  D.disassembled

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• 2The cetane number of a diesel fuel oil indicates its ______.

  A.viscosity

  B.acid content

  C.heating value

  D.ignition quality

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• 3The discharge flow of a reciprocating pump is ______.

  A.steady

  B.in pulsation

  C.continuous

  D.large

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• 4The ______engine is used for alternators and some times for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.

  A.four-stroke

  B.two-stroke

  C.slow speed

  D.reversible

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• 5The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices, during______.

  A.the upward stroke

  B.the downward stroke

  C.the power stroke

  D.the suction stroke

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• 6The total starting air capacity required for reversible main engines is to be sufficient for a least ______.

  A.six consecutive(连续的) starts

  B.eight consecutive starts

  C.ten consecutive starts

  D.twelve consecutive starts

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• 7A dirty diesel engine oil filter element can best be detected by ______.

  A.visual inspection of the elements

  B.the pressure drop across the filter

  C.high lube oil sump temperature

  D.decrease in oil viscosity from the filter

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• 8Before a marine diesel engine is started the cylinders and pistons must be ______.

  A.cooled to appropriate temperature

  B.warmed up gradually to appropriate temperature

  C.opened up and renewed

  D.ground and polished

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• 9A controllable pitch propeller on a diesel driven vessel eliminates the need for ______.

  A.friction clutches

  B.disconnect clutches

  C.reversing gears

  D.reduction gears

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