大管轮英语评估试题(1)

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大管轮英语评估试题(1),是针对大管轮轮机英语的模拟试题库。
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1 The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is _______.

A.they operate between 150 and 450 rpm

B.they are connected to the propeller by gearing

C.their smaller size and weight

D.they can be connected directly to the propeller without gearing

2 The SMS should provide for specific measures aimed at promoting the of equipment or systems, the sudden operational failure of which may result in hazardous situations.

A.visibility

B.ability

C.reliability

D.capability

3 If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two stroke/cycle diesel engine will develop approximately

A.the same indicated horsepower as a four-stroke/cycle engine

B.twice the indicated horsepower as a four-stroke/cycle engine

C.one half the indicated horsepower as a four-stroke/cycle engine

D.one power stroke for every two crankshaft revolutions

4 The desirable properties of a marine fuel oil should include .

A.high flash point and high viscosity

B.low flash point and high viscosity

C.low heating value and high sulphur content

D.high heating value and low sulphur content

5 The plunger in a jerk pump is rotated until the release port is uncovered If the port remains uncovered all of the time, which of the listed operations will occur?

A.No fuel will be delivered

B.The maximum effective stroke will be attained

C.The fuel delivered to the cylinder will be excessive

D.The injection nozzle will overheat and carbonize

6 In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the

A.crosshead

B.crankpin

C.crank journal

D.gudgeon pin

7 Due to action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

A.reciprocating

B.rotating

C.running

D.removing

8 What is the function of the after-coolers installed in the diesel engine air intake system?

A.Decrease the air density

B.Increase the exhaust temperature

C.Decrease the lube oil temperature

D.Increase the air density

9 Diesel engines are started by supplying_____into the cylinders in the appropriate sequence for the required direction.

A.cooling water

B.compressing air

C.compressed air

D.cylinder oil

10 If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will .

A.have a larger than normal dead band

B.produce excessive speed response to a load change

C.respond slowly to any change in engine load

D.stabilize engine speed at the new governor setting