The starting air system usually has （） to prevent starting if anything is not in order. -题库考试答案搜索网

The starting air system usually has （） to prevent starting if anything is not in order.

单选题

2022-01-03 08:14

A、drain cocks
B、vent valves
C、counteracts
D、interlock

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正确答案

D

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标签：船舶动力装置海船船员考试

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相关题目: 我国海船船员考试发证等规则的制定，是以（）公约为主要依据的。; A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.; A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.; 第二组Under normal operation, some lubrication oil mist may be discharged from the air compressor to the air start system. This oil may be from excess compressor cylinder lubrication, from faulty oil scraper rings, or may even be suspended oil vapor contaminating the engine room atmosphere and drawn in at the compressor suction. Oil discharge is kept to a minimum by draining the after cooler, air receiver and starting system. If small quantities of lubrication oil do get passed into the starting air system, they will deposit as thin moist film over internal pipe surfaces but are not readily combustible. If a cylinder non-return valve leak while the engine is in operation, some hot gas, possibly with unburned fuel and cylinder lubrication oil, may be blown through the valve to the adjacent air manifold. With further heating from the leaky valve, this, together with the already deposited oil film, will carbonize and form. incandescent carbon. If starting air is applied to the system while still hot, the high pressure air coming into contact with the burning carbon may cause an explosion. Such an explosion will cause a flame to pass back through the air start pipe system, evaporating the deposited oil film and igniting it in the presence of air. Very high velocities and shockwaves are generated which may rupture pipes and fittings.Alternatively, if excessive oil has entered the air start system, a mixture of air and oil droplets may be discharged through the open cylinder non-return valve during starting. This spray may ignite due to high temperatures in the cylinder, causing a flame through the still open valve to the air manifold.To prevent an explosion, air start valves must be correctly maintained and lubricated to ensure correct timing and free movement with positive closing. Oil in the system must be kept to a minimum, pipe lines must be drained and cleaned internally when necessary and oil discharge from air compressors must be kept to a minimum by good maintenance.The passage is mainly about; 《中华人民共和国海船船员船上培训管理办法》中的船上培训是指申请三副、三管轮适任证书的船员通过理论考试后在船舶上进行的（），以及申请船长、轮机长、大副、大管轮适任证书的船员通过理论考试后在船舶上进行的（）。; 申请海船船员适任证书考试的船员的应具备的条件包括。（）; 根据我国《海船船员适任考试、评估和发证规则》的规定，申请适任证书者应符合下列哪些基本条件，并不限于：（）I、持有有效的《船舶服务簿》；II、小于60周岁；III、申请海船高级船员适任证书者，年龄不小于20周岁；IV通过该规则规定的适任考试和评估，完成该规则规定的船上培训或见习。; 根据我国《海船船员适任考试、评估和发证规则》的规定，在中国籍海船上任职的船长、甲板部高级船员和值班水手应当持有与其所服务的（）和所担任的职务相符的有效适任证书。I、船舶航区；II、船舶种类；III、船舶等级；IV、主机类别。; 根据我国《海船船员适任考试、评估和发证规则》的规定，申请适任证书者应符合下列哪些基本条件，并不限于：（）I、持有有效的《船员服务簿》；II、男性船员小65周岁；III、符合海船船员体检标准；IV、通过本规则规定的适任考试和评估，完成本规则规定的船上培训或见习。; 根据《中华人民共和国海船船员适任考试发证规则》的规定，在中国籍海船上任职的船长、甲板部高级船员金额值班水手应当持有与其所服务的（）和所担任的植物相符的有效适任证书。
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Ⅰ．军用船舶；
Ⅱ．营业的游艇；
Ⅲ．渔船；
Ⅳ．构造简单的木质船舶。; It is usually decided by the（）terms whether the shipper or the consignee pays for the cargo insurance.; The forced draught fan should be started and air passed through the furnace for several minutes to “（）” it of any exhaust gas or oil vapors.; The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be （）.; The starting air system usually has （） to prevent starting if anything is not in order.; The starting air system usually has （） to prevent starting if anything is not in order.; The pressurized air is usually cooled to increase the charge air （）.; Air receivers installed in starting air systems are to be （）.

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