engine speeds. A. Bulbs B. Bulks C. Flyweights D. Flywheels 8. A governor automatically controls engine speed by regulating the ______.
A. fuel supply B. firing order C. engine load D. oil level 9. To correct a hunting problem in a main propulsion diesel engine hydraulic governor, you should ______.
A. increase the governor oil pressure B. adjust the speed droop setting C. adjust the speeder spring travel D. adjust the compensating needle valve
10. Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to ______.
A. temperature B. pressure C. engine speed D. all of the above
11. Which cause of the following can lead to the engine not to start on air?
A. starting air pressure too high B. correct timing of starting air valves C. three of the starting valves stuck D. the turning gear disengaged
12. ______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
A. An air receiver B. An operating valve C. An automatic valve D. An air distributor
13. ______in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.
A. Because B. Owing to C. For D. No matter
14. The required amount in the change of speed necessary before a governor will make a corrective movement is known as ______.
A. speed droop B. sensitivity C. stability D. promptness 15. Compressed air is used on board ship ______.
A. for starting diesel engines B. in pneumatic control system
C. in pneumatic tools D. All the above are true.
16. Supply the ______before starting an air compressor.
A. fuel oil B. cooling water C. steam D. power
17. During compressor?s running the accumulated moisture in the separators must be______.
A. drained off B. collected C. sent to the crankcases D. separated with oil
18. The starting air bottle should be pumped up to maximum pressure by the ______before start of the engine.
A. air compressor B. refrigeration compressor C. vacuum pump D. purifier
19. During the inspection, the starting air valves should be closed ______the engine from turning.
A. to increase B. to speed up C. to prevent D. to reduce 20. If the engine does not start on air, it may be due to______. A. low compression of the fuel pumps B. incorrect timing of fuel pumps
C. the starting air valves stuck D. air-locks in fuel oil pipeline
21. ______device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.
A. An automatic B. A transmission C. A self-regulating D. An interlocking
22. Which of the following problems can result in below normal pressure in the intercooler of an operating low pressure air compressor? A. Defective pressure pilot valve B. Defective receiver relief valve
C. Leaking intake valves on the high pressure cylinder D. Leaking discharge valves on the low pressure cylinder
23. The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be ______.
A. superheated B. super-cooled C. at or below the dew point D. all of the above
24. Open the ______of inter cooler before starting an air compressor.
A. cylinder cover B. cooling water C. oil cup D. drain valve 25. What preventative maintenance should be done frequently to diesel engine starting air receivers?
A. Drain the accumulated moisture. B. Test the relief valves.
C. Watch the temperature to prevent fluctuations in pressure. D. Clean the interior to remove oil and foreign matter.
Lesson 10
Preparation for Stand-by
单项选择题：
1. Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenging air belt, or from _______. A. exhaust valves B. starting valves C. fuel valves D. the indicator cocks
2. Before “stand by” ________ on the engine telegraph, it is usual to give the main diesel engine a brief trial on power ahead and astern. A. is delivered B. is rung C. is sent D. is transferred
3. Before putting on the starting air, the reversing and control gear should be ________. A. operated B. stopped C. checked D. removed 4. Before starting the engine the air bottle should be _______. A. pumped up B. loaded C. discharged D. opened
5. In order to inspect both piston and cylinder wall thoroughly, the cylinder cover should be taken off and the piston should be ______.
A. craned out B. rolled out C. lifted out D. turned out
6. The crankcase cover should not be opened until at least ______minutes after the engine stops.
A. 10 B. 15 C. 20 D. 30
7. “Movement of engine no longer required.” means “______”.
A. Stop Engine B. No Engine Revolution C. Stand-by Engine D. Finished With Engine
8. The lubricating pipes and ducts should be blown out with ______. A. the atmosphere B. the fresh water
C. the compressed air D. the chemical compounds
9. ______neutralizes the acid conditions and ______cleanses the rings and grooves. A. The detergency/the alkalinity B. The alkalinity/the detergency
C. The inhabitant/ the water D. The additives/the distilled water
10. Immediately after any diesel engine is started, the engineer should check the ______.
A. crankcase pressure B. lube oil pressure C. seawater pressure D. exhaust temperature
11. After “F.W.E.” is given, the air system is shut down, the ______gear put in, all drains and indicator cocks opened, and the cooling water kept running. A. steering B. timing C. turning D. running
Lesson 11
Operating Troubles and Their Remedies
单项选择题：
1. Blow-off of the relief valves of the engines cylinders may be caused by ______. A. too low load B. water in fuel C. too tight spring aD. leakage
2. Blow-off of the relief valves of the main cylinders during operation indicates ______.
A. the cylinder cover is cracked B. the injector holes is clogged C. the cams are not properly set D. fuel pump is leaking
3. Charging is the filling of the engine cylinder with a supply of ______ for compression. A. water B. fresh air C. fuel oil D. gas 4. Engine fuel pump index is ________. A. the viscosity index B. the fuel oil contents C. the starting speed D. the reading at the rack
5. Excessive clearance in the main or crankpin bearings will sometimes be indicated
by ______ before any bearing knock is heard. A. loss of flow in the fuel system B. loss of pressure in the air system C. loss of flow in the lubricating system D. loss of pressure in the lubricating system
6. Exhaust temperature increases in all cylinders, the possible cause may be _______. ① increased scavenging air temperature, ② air in fuel pumps and fuel valves, ③ fouling of air and gas passages. A. ① + ② B. ① + ③ C. ② + ③ D. ① + ② + ③
7. Fuel has been injected but ignition fails. The possible cause may be ______. A. leaky exhaust valve B. increased scavenging air temperature
C. engine cylinders not scavenged sufficiently D. water in the fuel oil
8. If _______ are taken at regular intervals, any unequal distribution of load will be easily found out.
A. differential of crank-webs B. indicator diagrams C. lube oil reading out D. misalignment of crank-throws 9. If the engine does not start on air, it may be due to _________. A. low compression of the fuel pumps B. incorrect timing of fuel pumps C. the starting air valves stuck D. air-locks in fuel oil pipeline
10. If the engine does start on air, but combustion does not immediately begin, the cause may be ________. A. failure of the fuel pumps B. starting air pressure too low C. stop valve in air line closed D. the turning gear still engaged
11. The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and ________ of the pistons in the cylinders. A. crack B. knocking C. leaking D. seizure
12. Which of the following may take place if the clearance of the main bearings are excessive?
A. bearing knocks B. dropping of pressure of L.O C. noises D. all the above
13. _________ clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard. A. Too larger B. Too smaller C. Excess D. Excessive 14. Bearing knocks are likely to occur from _________. A. less clearance B. dirty lube oil C. overload D. bearing wear 15. The most common contaminate of governor hydraulic fluid is ______.
A. moisture B. dirt C. acid D. air 16. The first requirement for logical trouble shooting of any system is the ability to ______.
A. collect all available data on a casualty B. recognize normal operation
C. identify the probable cause of a symptom D. isolate the faulty component
17. If the jacket water temperature of an operating diesel engine suddenly rises above normal, the cause can be attributed to ______.
A. an overfilled expansion tank B. excess chromate treatment of the jacket water
C. a clogged raw water sea suction D. cavitation erosion of the heat exchanger tubes
18. During repair, lubrication lines and orifices must be______.
A. taken away B. engaged C. connected D. sealed off 19. Low compression of diesel engine may result from ______.
A. a worn cylinder B. broken piston rings C. any of A and B D. none of the above
20. White smoke exhausting from an operating diesel engine may indicate ______. A. a cracked liner B. burning lube oil C. an overloaded engine D. insufficient combustion air 21. Defective timing gear in a diesel engine may lead to:
A. smoky exhaust B. starting failure C. overload D. over speed 22. To successfully reduce an excessively high diesel engine exhaust gas temperature, you should ______.
A. reduce the engine driven fuel pump outlet pressure B. retard the fuel injector timing to reduce power C. increase the fuel rack setting D. reduce the load on the engine
23. Combustion knock can occur in the cylinders of a diesel engine under any condition permitting ______.
A. a shortened ignition delay period B. a lean fuel/air mixture C. excess fuel in the combustion chamber D. rapid vaporization of injected fuel droplets
24. Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle, turbo-charged, diesel engine? A. Clogged air intake filters. B. Piston blow-by.
C. A defective after-cooler. D. Faulty exhaust valves.
25. High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by ______.
A. engine overload B. low combustion temperature C. plugged fuel nozzle holes D. excessive compression pressure 26. In a diesel engine, excessive cylinder liner wear will cause ______.
I. increased blow-by II. wear between the piston ring and groove A. I only is correct B. II only is correct C. both I and II are correct D. neither I or II are correct
27. The lengthening of a crack formed in the shell plating of a ship may be prevented by ______.
A. welding brackets across both ends of the crack B. chipping out and slot welding the entire crack C. drilling a hole at each end of the crack