大管轮轮机英语综合
11. The engine speed at which resonance can occur is termed ______.
A. maximum speed B. full speed C. sea speed D. critical speed
12. A crankshaft whose center of gravity coincides with its center line is said to be______.
A. dynamically balanced B. statically balanced C. counter balanced D. resonantly balanced 13. ______ the repair in so short a time is unknown to us.
A. How they finished B. How did they finished C. That how they finished D. That how did they finished
14. The principle of hydrostatic lubrication has been applied to the cross-head using______.
A. high pressure lubricators B. tie rods C. fuel injectors D. fuel valves 15. Load control on a diesel engine is accomplished by______.
A. regulating the speed of the turbocharger B. rotating the fuel injector pump plunger
C. regulating the speed of the fuel oil transfer pump D. changing engine timing
16. A reduction in load on a diesel engine results in ______of speed of the crankshaft.
A. a reduction B. an increase C. an outing D. a downwards
17. Which of the listed statements is correct concerning the starting of centrifugal pumps?
A. They should always be started with the discharge valve closed. B. They should always be started with the discharge valve opened. C. A priming pump is always required to flood the impeller suction. D. They should always be started with the sealing line valves closed.
18. The ______discharge a nearly constant amount of liquid regardless of pressure.
A. mixed-flow pump B. axial-flow pump C. centrifugal pump D. displacement pump 19. In an auxiliary boiler steam and water system, the highest pressure will be in the ______.
A. steam stop valve B. dry pipe C. feedwater system D. generating tubes 20. The rate of heat transfer in a water-tube auxiliary boiler can be increased by ______.
A. operating the boiler at less than normal water level B. installing fins on the firesides of water-tubes C. increasing the amount of excess air to the burners
D. treating the boiler water with chemical oxygen scavengers
21. High-speed rotation in a centrifugal purifier can produce a force______ the force of gravity.
A. many thousand times larger than B. the same as
C. many thousand times smaller than D. none of the above
22. When in operation, it is unavoidable that a small amount of oil ______through leakage, and in
order to compensate for these leaks the system is connected to a feed pump. A. escapes B. overheats C. expands D. accelerates
23. Grease the roller bearings with H.P. gun . In the sentence "H.P." means______.
A. horse power B. high pressure compressor C. hand pump D. high pressure 24. The oil sludge is burnt in the _____onboard. I ll show you the ashes.
A. boiler B. main engine C. auxiliary engine D. incinerator
25. The term ‘ discharge ’ , as it applies to the pollution regulations, means ______.
A. spilling B. leaking C. dumping D. all of the above
26. When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the
oil ______.
A. viscosity will decrease B. volume will increase
C. volume will decrease D. pour point will be reduced
27. ______are used for hauling in or letting out the wires which fasten the ship to the shore. A. Cargo winches B. Mooring winches C. Windlasses D. Cargo hatches
28.
Which of the following hydraulic systems is not one of the three sub-division of the hydraulic drive system?
A. constant pressure system B. variable pressure system C. variable displacement system D. constant volume system
29.
With reference to rules governing steering gear, which one of the following rules is incorrect ? A. It is required that all ships are provided with two independent steering gear systems that is one main and one auxiliary.
B. The auxiliary gear could be power operated in passenger ships.
C. The auxiliary gear must be of adequate strength and sufficient to steer a ship at navigable speed.
D. All moving parts of the steering gear must be guarded against any possible damage. 30. Broken valve strips in an operating low pressure, air compressor will cause ______. A. an immediate crankcase explosion B. oil contamination in the compressed air
C. a decrease in compressor capacity D. no immediate loss of the compressed air capacity 31.
Condensate must be drained from the intercooler and after-coolers of an air compressor because ______.
A. the cooling effect of the condensate reduces the compressor's efficiency B. a danger of explosion exists whenever water is present in a compressor C. water causes erratic operation of pneumatic components
D. the volumetric capacity of the first stage is reduced if water remains
32.
If the head pressure of a reciprocating refrigeration compressor is excessive, ______. A. the relief valve should open before the high pressure cutout
B. the relief valve should open and allow the excess refrigerant to flow to the receiver C. the high pressure cutout switch should operate before the relief valve opens D. you should close the suction valve
33. Sludge may form in the crankcase of an air conditioning compressor as a result of ______. A. bubbling refrigerant B. overheating and oxidation
C. lowered operating temperatures D. reducing the cloud or flash point 34. A feeler or thermal bulb is used for the expansion valve to ______. A. detect the temperature B. detect the pressure
C. heat the refrigerant D. accelerate the refrigerant
35.
The dew point of air is reached when the wet bulb temperature is ______.
A. twice the dry bulb temperature B. 10℃ above the dry bulb temperature C. 5℃ above the dry bulb temperature D. equal to the dry bulb temperature 36. ______ is used to produce electric power.
A. An alternator B. A fresh water generator C. A compressor D. A clarifier 37. In order to change the direction of rotation of a D.C. motor ______.
I. the field leads must be changed ; II. the input leads must be changed A. I only B. II only C. either I or II D. neither I or II
38.
Which of the following should be the FIRST step in removing a generator from parallel operation? A. Trip the generator off the switchboard.