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单选题
What is an advantage of diesel over steam turbine propulsion? （）
A
Less fuel consumption per SHP
B
Diesel fuel costs less than bunker C or its equivalent
C
Less routine maintenance required
D
Less weight per SHP
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更多 “单选题What is an advantage of diesel over steam turbine propulsion? （）A Less fuel consumption per SHPB Diesel fuel costs less than bunker C or its equivalentC Less routine maintenance requiredD Less weight per SHP” 相关考题
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The thermal energy of the steam is converted into ( ) energy by the turbine.
A.electricalB.mechanicalC.chemicalD.potential
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As for turbine oil, contact with water in the form of steam will be inevitable so good______properties will be essentialA.defrostingB.de-oilingC.demulsifyingD.dehumidifying
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The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause?A.Faulty thermostatic bypass valveB.Eroded zinc pencils in the heat exchangerC.Steam formation in the expansion tankD.Excessive leakage from jacket water pump seals
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What is/are the advantage（s）of cranes over conventional cargo booms ________．A.Cranes are able to pick up and drop loads over a greater spotting areaB.Increased safety because the deck is clear of running and standing riggingC.Simplicity of operation of the crane by its operatorD.All of the above
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Centrifugal pumps have what advantage（s）over reciprocating pumps ________．A.They are less expensiveB.They are smaller for equivalent pumping abilityC.They pump more cargo in less timeD.All of the above
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What is an advantage of a gate valve over a butterfly valve ________．A.Less frequent maintenanceB.Faster operationC.CheaperD.More compact
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What is an advantage of diesel over steam turbine propulsion ________．A.Less fuel consumption per SHPB.Diesel fuel costs less than bunker C or its equivalentC.Less routine maintenance requiredD.Less weight per SHP
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A dry-steam reservoir produces steam with _____.A.the energy to turn a turbine
B.impermeable rock
C.one or two separators
D.turbine operator
E.little or no water
F.hot springs
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What is an advantage of an externally modulated laser over a directly modulated laser?（）A、lower costB、higher chirpC、easier to manufactureD、higher dispersion toleranceE、higher optical signal-to-noise ratio
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单选题One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.A
the extra weight required for the diesel reduction gearingB
a minimum speed for the engines that limits the minimum speed of the vesselC
the higher fuel consumption per SHPD
the low efficiency of the system when a controllable pitch propeller is used
考题
单选题While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）A
Manually trip the over-speed deviceB
Interrupt the fuel flow to the engineC
Disengage the safety interlockD
Slide the camshaft to the neutral position
考题
单选题For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）A
moving the governor control to stopB
shutting off the lubricating oil supplyC
tripping the governor emergency stop leverD
shutting off the fuel supply
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单选题What is an advantage of an externally modulated laser over a directly modulated laser?（）A
lower costB
higher chirpC
easier to manufactureD
higher dispersion toleranceE
higher optical signal-to-noise ratio
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单选题Which method should be used to warm up the pump turbines prior to discharge（）.A
Lock the turbine rotor and slowly bleed in steam until operating temperature is reachedB
Run the pump at high speed with the discharge valves closedC
Run the turbine at slow speed with the pump disconnectedD
Shut the discharge valve and run the pump at slow speed
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单选题What is an advantage of a steam turbine over a diesel for the main propulsion?（）A
Faster response from ahead to asternB
Less fuel consumptionC
Cheaper initial installation costD
Less weight per unit of horsepower
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单选题Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.A
They are less expensiveB
They are smaller for equivalent pumping abilityC
They pump more cargo in less timeD
All of the above
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单选题What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）A
WhiteB
BlackC
BlueD
Clear
考题
单选题Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to （）A
test the starting systemB
remove condensation from the cylindersC
check the compressionD
check for proper lube oil pressure
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单选题As for turbine oil, contact with water in the form of steam will be inevitable so good （） properties will be essential.A
defrostingB
de-oilingC
demulsifyingD
dehumidifying
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单选题Cast iron pistons used in large propulsion diesel engines are constructed with （）A
not taper what so everB
the skirt being tapered and smaller than the crownC
the skirt being tapered and larger than the crownD
the crown being tapered and smaller than the skirt
考题
单选题Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）A
The expansion tank should be topped offB
The thermostatic water regulating valves should be manually openedC
The fuel filters should be changedD
The engine should be turned over slowly with the indicator cocks open
考题
单选题A donkey boiler is （）.A
one to supply steam to the main propulsion turbineB
an auxiliary boilerC
A and BD
neither A nor B
考题
单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
a modern diesel engine；a turbine wheelB
a modem diesel engine；exhaust gasesC
a compressor；an exhaust gas turbochargerD
a compressor；a turbine wheel
考题
单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）A
The diesel oil must never be allowed to mix with the heavy fuelB
The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveC
The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valveD
The heating steam must be secured before the diesel oil passes through the three-way valve
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单选题What is NOT an advantage of containership operations over conventional break-bulk operations? （）.A
Flexibility of operationB
Greater operational safetyC
Lower stevedoring costsD
Reduction of cargo damage
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单选题With（） the engine need not to be aligned with reduction gears or propeller shaft.A
Diesel engine propulsionB
Diesel electric propulsionC
Steam engine propulsionD
Gas turbine propulsion
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单选题What is/are the advantage（s）of cranes over conventional cargo booms（）.A
Cranes are able to pick up and drop loads over a greater spotting areaB
Increased safety because the deck is clear of running and standing riggingC
Simplicity of operation of the crane by its operatorD
All of the above
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