輪機(jī)英語(yǔ)船舶電氣與船舶安全章節(jié)練習(xí)(2019.04.30)

單項(xiàng)選擇題
If a diesel engine were running at 20% overload with a smoky exhaust, you should（）
A.stop the engine immediately to prevent damage
B.increase lube oil pressure
C.slow the engine allowing it to gradually cool
D.decrease the cooling water it temperature to the water jacket
單項(xiàng)選擇題
Air bubbles in a hydraulic governor can cause （）
A.sluggish response
B.speed droop variations
C.isochronous governing
D.sensitivity increase
單項(xiàng)選擇題
In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.
A.produce a scavenging effect in the combustion space
B.equalize cylinder and exhaust manifold pressures
C.alleviate the difference in valve size between the intake and exhaust
D.flush out condensate that collects after each compression stroke
單項(xiàng)選擇題
In a pneumatic automation system, a unit producing a signal to govern the position of the controller of the measured variable, relative to the value of the measured variable, is said to have（）.
A.reset action
B.proportional action
C.two position action
D.rate action
單項(xiàng)選擇題
Before marine sewage treatment plant works （） should be filled with fresh water.
A.deposition chamber
B.oxidation pool
C.disinfection chamber
D.all chamber
單項(xiàng)選擇題
Which of the listed classes of fire is considered as one involving electrical equipment?（）
A.Class "A"
B.Class "B"
C.Class "C"
D.Class "D"
單項(xiàng)選擇題
The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the（）
A.degree of cylinder air turbulence
B.firing pressure in the engine
C.quality of fuel to be injected
D.duration of the ignition delay period
單項(xiàng)選擇題
The size of the exhaust valve opening is （）
A.most critical in a four-stroke cycle diesel engine
B.most critical in a two-stroke/cycle diesel engine
C.most critical in a four-stroke/cycle diesel engine if it is turbocharged
D.of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
單項(xiàng)選擇題
The process of scavenging a two-stroke/cycle diesel engine serves to（）
A.improve fuel flow volume
B.cool the exhaust valves
C.reduce the intake air charge density
D.increase the temperature of exhaust gases
單項(xiàng)選擇題
Self-excited a-cgenerator with "error operated" voltage control systems draw the full excitation power for the machine terminalsThis dispenses with the current transformers, reactors and capacitors necessary for accurate compounding, but renders the excitation system vulnerable to variations in its output voltageWhich of the following is correct about the generator mentioned according to the sentences above （）.
A.It consumes no excitation power
B.It has current transformers
C.Components are needed for accurate compounding
D.Its excitation system is vulnerable to voltage variations

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