单项选择题When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.

A.strength
B.dense
C.percentage
D.velocity

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1.单项选择题When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and （）.

A.slightly acidic
B.slightly alkaline
C.no salty
D.slightly bitter

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2.单项选择题When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.

A.just
B.nearly
C.merely
D.already

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3.单项选择题When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.

A.stand-by engine
B.full ahead
C.finished with engine
D.full away

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4.单项选择题When the follower is on the base circle of the cam, the pump plunger is at the （） of its stroke.

A.top
B.middle
C.bottom
D.any of the above

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5.单项选择题When a crankshaft has to be handled outside the engine, it should be carefully supported in a manner which will avoid （） high bending moments on it.

A.compressing
B.interposing
C.imposing
D.pounding

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6.单项选择题When a crankshaft （） outside the engine, it should be carefully supported in a manner which will avoid imposing high bending moments on it.

A.has to be handled
B.may be handled
C.has being handled
D.will be handling

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7.单项选择题Vents are led from the engine to the head tank for the release of （） from the cooling water.

A.air
B.heat
C.sludge
D.steam

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8.单项选择题Vents are led from the engine to head tank （） from the cooling water.

A.for the release of air
B.for the release of water
C.in order to the release of air
D.because the release of air

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9.单项选择题Vee-type engines have the connecting rods from two cylinders connected to each （） of the crankshaft.

A.throw
B.web
C.main bearing
D.deflection

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10.单项选择题Valve overlap is the period during which （）.

A.the inlet valve is open
B.the exhaust valve is open
C.both valves are closed
D.both valves are open

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最新试题

The function of diesel engine piston compression rings is to （）.

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Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.

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Diesel engine control can be obtained by the bridge （）.

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Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.

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Routine monitoring of a diesel engine should include （）.

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In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.

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If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.

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A thrust bearing is used with a propulsion diesel engine to （）.

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A diesel engine piston ring face is in direct contact with the （）.

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The main purpose of the piston oil scraper rings is to （）.

题型：单项选择题