The term    refers to one complete sequence of operations required to produce power in an engine.
  A. diesel engine    B. stroke    C. cycle      D. compression ratio
62. The    is the power available at the output shaft of the engine and can be measured using a torsionmeter or with a brake.
  A. electric power  B. shaft power  C. indicated power    D. mechanical power
63. VIT means    .
  A. variable injection timing    B. variable inlet tonnage
  C. vertical incoming tonnage    D. vertical incoming tank
64. Supposed the rated capacity of the main engine of a ship is 10000kw at 100 rated r/min, then when at 80r/min its capacity should be    .
  A. 800kw    B. 5120kw    C. 6400kw      D. 4180kw
65. Engine displacement is equal to the cylinder    .
  A. area times the stroke    B. area times the stroke, times the number of cylinders
  C. volume times the stroke  D. volume times the stroke, times the number of cylinders
66. In describing engine operation, what does the term“cycle”mean?
  A. The sequence of events that produce a power pulse.
  B. One rotation of the engine crankshaft   
  C. One stroke of a piston      D. All of the above
67. The time between injection and ignition of the fuel is known as    .
  A. turbulence          B. after burning ratio
  C. pre-ignition lag      D. ignition delay
68. The compression ratio of the diesel engine refers to the ratio between the    .
  A. piston area to connecting rod length
  B. cylinder volumes at bottom dead center and at top dead center
  C. engine cylinder size to piston size
  D. the number of compression strokes for a given horsepower
69. The most important factor in engine performance is the actual power output at the end of the crankshaft available of doing work. This is known as_____.
  A. indicated horsepower  B. brake horsepower  C. net horsepower  D. friction horsepower
70. The injection 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
71. A clearly visible benefit of RT-flex engine is their _____ operation at all ship speeds. This is achieved by the superior combustion performance.
  A. shock less  B. smokeless    D. no vibration    D. noiseless
72. 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
reaction in the shaft73. Compared to four-stroke/cycle engines, two-stroke/cycle 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
74. 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
75. In order to control thermal stresses, some types of modern engines use pistons with_____.
  A. heavy wall and intensive cooling    B. heavy wall and no cooling
  C. thin wall and no cooling          D. thin wall and intensive cooling
76. A piston in a four-stroke/cycle diesel engine makes four strokes during each_____.
  A. crankshaft revolution    B. mechanical cycle of operation
  C. period of two combustion cycles    D. cycle of two events
77. Crankshafts of medium speed engines are _____ from a single piece of steel.
  A. unusually solid welded      B. never be solid forged
  C. almost invariable solid forged    D. almost invariable be welded
78. In a two-stroke engine the crankshaft rotates at _____ the engine rotational speed.
  A. half      B. twice    C. the same speed as    D. four times
79. A diesel engine is similar to a gasoline engine except that the former has no_____.
  A. cross-head  B. cylinder    C. connecting rod    D. spark plug
80. However fast or slow the combustion rate, it is still a _____between carbon, hydrogen, sulphur and oxygen that release heat.
  A. physical deformation  B. state exchange  C. chemical reaction    D. coalescence
81. _____of different thickness are inserted between the shells to enable adjustment of the bearing clearances.
  A. Screws    B. Films    C. Discs    D. Shims

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。