轮机长用必威体育精装版轮机英语4647试题库.pdf

. . . . . 编号 问题 选择 A 选择 B 选择 C 选择 D 答案 注解 1 On a large diesel engine installation, crankshaft axial alignment is maintained by the ________. piston rod guides engine thrust bearing crosshead bearing main shaft flexible coupling B 在大型柴油机安装中， 曲轴靠推力轴承保 持轴向对中。 2 A diesel engine which is rated for normal operation at a crankshaft speed of 800 rpm, is commonly classed as a ________. slow-speed diesel medium-speed diesel high-speed diesel constant-speed diesel B 曲 轴 转 速 800 转／分以额定功率正常运行的柴油机称 为中速柴油机。 3 Which of the following statements is correct concerning available astern power for diesel main propulsion systems? Astern power is to be provided in a sufficient amount to secure proper control of the ship in all normal circumstances. The astern power of the main propelling machinery is to provide for continuous operation astern at 60% of the ahead rpm at rated speed. For main propulsion systems without reversing gears, controllable pitch propellers or electric propulsion drive, running astern is not to lead to overload conditions. Astern power available will be equal to ahead power when controllable pitch propellers are utilized, thus discounting the need for increased operating parameters. A 倒车功率必须能 提供足够的功率确保在各种正常情况下能够对船舶进行适当的控制。 4 When two medium speed diesel engines coupled in parallel to a commonpropeller shaft that operates at the same speed as the engines, which of the operating conditions listed will apply?