轮机英语第45期
1. These acid residues must be prevented from entering the crankcase otherwise the lube oil would be _______
A. contaminated      B .emulsified    C deteriorated      D .oxidated
2.  The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its _______
A. thermal efficiency                  B. mechanical efficiency
C. brake thermal efficiency              D. volumetric efficiency
3.  The cetane number of a diesel fuel oil medicates its _________
A. viscosity          B. acid content    C. heating value      D. ignition quality
4.  The greatest turbulence in a diesel engine cylinder is created by the ________
A. shape of the combustion chamber      B. fuel injection spray pattern
C. cylinder swept volume                D. degree of penetration of the fuel oil droplets
5.  The projection on a shaft designed to change circular motion into up and down or back and fore motion is called ______
A. wheel        B. crankshaft    C. running gear      D. cam
6.  A clearly visible benefit of RT-flex engines is their ________operation at all ship speeds.This is achieved by the superior combustion performance.
A. shockless      B. smokeless      C. no vibration      D noiseless
7.  A main bearing consists of two shells which are secured by means of studs and______
A. tie rods        B. through bolts    C. lead wires        D. bearing caps
8.  Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of _________
A. less even torque                      B. higher cylinder head temperatures
C. fewer power strokes per revolution      D. greater weight/size requirements
9.  ________controls the fuel oil temperature in order to provide oil at the correct viscosity for combustion
A. The viscosity regulator                      B. The temperature controller
C. The flow meter                            D. The pressure switch
10. A lubricant often has to perform many duties in any situation, in addition to its fundamental job of __________
A. resisting  oxidization                      B. reducing friction
C. promoting moving speed                    D. developing inertia
11. Shaker, circulation, and spray are the three general methods used in _______
    A. pre-injection fuel oil treatment              B. lube oil filtration
C. lube oil purification                        D. piston cooling
12. Which of the diesel engine components listed increases air density and helps to improve engine operating efficiency?
reaction in the shaftA. Impeller            B. Air bottle      C. Air cooler    D Exhaust diffuser
13. Each cylinder has one starting valve which is usually opened by air pressure and closed by __________.
A. nuts and bolts      B. new joints      C. spring force    D. sealing rings
14. Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?
A. Sensitivity      B. Power      C. Speed droop    D. Compensation
15. A pyrometer is an instrument commonly used to measure_______.
A. cylinder pressure                  B. flame intensity
C. exhaust gas temperature            D. crankshaft axial alignment
16. After starting a diesel engine, which of the listed operating conditions should be checked first?
A. Air box pressure    B. Lube oil pressure 
C. Exhaust temperatures  D. Raw water pressure
17. A high temperature alarm or ______ which will melt is used to guard against the explosion of compressor air pipelines.
A. a flame trap      B. a relief valve    C. a fusible plug    D. a bursting cap
18. Great care is dedicated to the removal of ______from the scavenge air.
A. gravity        B. viscosity        C. density        D. humidity
19. Lubrication for the main reduction gears used with diesel engines is usually supplied by ____
A. oil from the main engine sump              B. an independent lube oil system
C. the stern bearing head tank                D. the stern bearing sump tank
20. The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.
A. gas composition    B. gas temperature      C. pressure      D. timing

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