單項選擇題The flame safeguard control system of a large automatic auxiliary boiler will provide fuel shut off in the case of high ().

A.water
B.voltage
C.fuel pressure
D.steam pressure


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1.單項選擇題The operating water is supplied under the ()of an oil separator.

A.sliding bowl bottom
B.bowl hood
C.bowl
D.filter units

2.單項選擇題The ()has a water damp ring.

A.purifier
B.oil/water separator
C.incinerator
D.distiller

3.單項選擇題Duty officer informs us that the vessel is out of harbor and in “Full Ahead”We are going to run ().

A.diesel oil instead of fuel oil
B.fuel oil instead of diesel oil
C.diesel oil instead fuel oil
D.fuel oil instead diesel oil

4.單項選擇題The bearing cap and shell are replaced and tightened up until ().

A.the “ nip ”is zero
B.the “ nap ” is zero
C.the “ gap ”is correct
D.the “ clearance ” is correct

5.單項選擇題In ()the control action is independent on the output.

A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear

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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?()

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The condensers located in various stages of a flash evaporator are cooled by()

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“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a()

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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is()

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During the diesel engine running, the water level of F.W expansion tank should normally kept in the () level of glass tube.

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()are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

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The additional mark ()in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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When does auxiliary burner of incinerator put into operation? ()Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

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A purge recovery system is used in a centrifugal air conditioning or refrigeration system to ()

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() is not installed on the main switchboar.

題型:單項選擇題