問題一覧
1
282. A mooring winch should be equipped with mechanical brakes capable of holding,
•the full breaking strength of the mooring line
2
260. What is the effect if fuel oil tanks of a vessel is half full ?
•free surface effect
3
255. Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce ?
•carbon accumulation on the nozzles
4
265. It is a form of energy which crosses the boundary of a system during a change of state produced by a difference of temperature between the system and its surroundings.
•Heat
5
272. Which of the following controls the amount of fuel atomized by a return flow oil burner ?
•Fuel oil return valve
6
277. Differential needle valves used in fuel injectors are directly closed by what?
•spring force
7
275. Which of the following characteristic that determines the temperature to which fuel must be heated for proper atomization is ?
•viscosity
8
279. The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally ?
•gums, varnishes, and acids
9
287. Diesel engine jacket water is used in the fresh water distillation process as the ?
•means of heating the feedwater
10
266. The high pressure cut-out switch will stop the refrigeration compressor when there is ?
•a stoppage of condenser cooling water flow
11
251. Which of the following methods is used to counter axial thrust in a single flow reaction turbine ?
•A dummy piston and cylinder at the turbine inlet end
12
291. What is the reason why steam pressure reduces its pressure while accomplishing work in the engine or turbine?
•The steam expands in volume
13
274. If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the
•control air system
14
276. Stern tube is used to ?
•support and seal the propeller shaft
15
254. What is the function of boiler variable capacity pressure regulator in atomizing fuel insside burner
•Provide wide range of combustion
16
295. if the water level cannot be seen in the lower part of the boiler gage glass, which of the following actions must be carried out immediately ?
•Secure the boiler fires
17
270. In hysraulic system, with an increase in temperature, what will happen to the volume of hydraulic fluid ?
•expand
18
288. Nozzle diaphragms are installed in pressure-compounded impulse turbines to
•hold the nozzle of the stage and admit steam to moving blades
19
298. Which significant combustion elements of fuel oil is a major source of air pollution?
•Sulphur
20
285. Which part of a diesel engine that fuel is admitted into the cylider combustion chamber?
•injector nozzles
21
•Pressure equalizing holes in the individual rotor wheels
•Serves to mix the air evenly with the fuel
22
259. Excessive scale formation in a distilling plant may result from?
•Improper vacuum regulation
23
281. To what purpose why is strainer install on hydraulic system?
•To prevent solid particles from entering the pump
24
296. The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the
•feedwater vapor pressure
25
271. In a diesel engine, the fuel consumption is expressed in ?
•grams per horsepower per hour
26
262. In case Engine room is unmanned and Diesel Engine is running, when the temperature of cooling, water outlet is one degree above the limit in long period of time. What is the next immediate better thing to do?
•Check the setting of temperature controller
27
258. Which of the following will happen if the fuel oil heater attains excessively high temperature ?
•Carbon deposits will build up in the surfaces
28
269. An air compressor is equipped with an intercooler and an aftercooler to ?
•increase compressor efficiency.
29
299. If a higher than normal water level is observed through the inspection port of a low pressure distilling plant, you should suspect ?
•Improper vacuum
30
300. Air trapped in the hydraulic fluid of a steering system would be indicated by:
•erratic rudder response
31
253. An internal bypass is provided on some hydraulic system suction strainers to help reduce the posibility of?
•pump cavitations
32
286. The dimension of the thinnest hydrodynamic film developed within a full journal bearing, when all other factors remain constant, depends upon the ?
•fluidity of the lubricant
33
293. What type of engine uses a high cetane number?
•Small, high speed
34
284. What will happened to air compressor unloading system if all of the air charge has been lost from ship service air receiver?
•Fail to work but the compressor having no load will start with little or no difficulty
35
261. Scavenging trunks are more prone to fire because they are ?
•accumulating oily substance
36
280. The action should take when water is found in the fuel oil setting tank is to ?
•shift pump suction to an alternate settling tank
37
292. Before loosening pump covers how should the pressure be checked ?
•air vent valve open and clear
38
267. In a low pressure air compressor, the loss of volumetric efficiency normally results from ?
heating of the air leaving the cylinders
39
290. Gas turbine has operational flexibility. Which of the following is the reason?
•Swift start up, no warm up or idling period is required.
40
268. As found in a basic pneumatic automatic combustion control system, the function of standarizing, relay is to
•introduce a control for maintaining constant steam pressure regardless of boiler load
41
264. The boiler feedwater control valve varies the relationship between steam and water flow during periods of ?
•steady boiler load
42
297. A reading of zero on a Bourdon tube instrument generally means ?
•equal to atmospheric pressure
43
294. What is the importance of the control box of a differential gearsystem in a steering gear system?
•It compares the bridge signal to the actual rudder angle through the follow up gear
44
289. In the Hydropore tank, What is the device intalled to starts/stops the pump ?
•Pressure switch
45
273. Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from ?
•outside the space concerned
46
256. Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling temperature from an individual cylinder begins to rise what should you suspect ?
•That there is an overloading of cylinder
47
257. Centrifugal pumps, used to handle hot liquids, must have a minimum flow through them under all operating conditions. This flow serves to ?
•prevent overheating and vapour bound conditions
48
283. You observed an efficiency drop caused by compressor fouling of the gas turbine, what is the most effective counter measure to carry out?
•Off-line washing
49
263. Emergency diesel generator day tank should always be kept full to reduce the possibility of ?
•moisture formation from condensation
50
278. An excessive pressure differential across a lube oil strainer could indicate the ?
•upside down Strainer needs cleaning