competence 4.6

50問 • 1年前

ERNO ENRIQUE JOMENTO

通報

問題一覧

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

•Pressure equalizing holes in the individual rotor wheels

•Serves to mix the air evenly with the fuel

253. An internal bypass is provided on some hydraulic system suction strainers to help reduce the posibility of?

•pump cavitations

254. What is the function of boiler variable capacity pressure regulator in atomizing fuel insside burner

•Provide wide range of combustion

255. Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce ?

•carbon accumulation on the nozzles

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

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

258. Which of the following will happen if the fuel oil heater attains excessively high temperature ?

•Carbon deposits will build up in the surfaces

259. Excessive scale formation in a distilling plant may result from?

•Improper vacuum regulation

260. What is the effect if fuel oil tanks of a vessel is half full ?

•free surface effect

261. Scavenging trunks are more prone to fire because they are ?

•accumulating oily substance

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

263. Emergency diesel generator day tank should always be kept full to reduce the possibility of ?

•moisture formation from condensation

264. The boiler feedwater control valve varies the relationship between steam and water flow during periods of ?

•steady boiler load

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

266. The high pressure cut-out switch will stop the refrigeration compressor when there is ?

•a stoppage of condenser cooling water flow

267. In a low pressure air compressor, the loss of volumetric efficiency normally results from ?

heating of the air leaving the cylinders

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

269. An air compressor is equipped with an intercooler and an aftercooler to ?

•increase compressor efficiency.

270. In hysraulic system, with an increase in temperature, what will happen to the volume of hydraulic fluid ?

•expand

271. In a diesel engine, the fuel consumption is expressed in ?

•grams per horsepower per hour

272. Which of the following controls the amount of fuel atomized by a return flow oil burner ?

•Fuel oil return valve

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

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

275. Which of the following characteristic that determines the temperature to which fuel must be heated for proper atomization is ?

•viscosity

276. Stern tube is used to ?

•support and seal the propeller shaft

277. Differential needle valves used in fuel injectors are directly closed by what?

•spring force

278. An excessive pressure differential across a lube oil strainer could indicate the ?

•upside down Strainer needs cleaning

279. The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally ?

•gums, varnishes, and acids

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

281. To what purpose why is strainer install on hydraulic system?

•To prevent solid particles from entering the pump

282. A mooring winch should be equipped with mechanical brakes capable of holding,

•the full breaking strength of the mooring line

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

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

285. Which part of a diesel engine that fuel is admitted into the cylider combustion chamber?

•injector nozzles

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

287. Diesel engine jacket water is used in the fresh water distillation process as the ?

•means of heating the feedwater

288. Nozzle diaphragms are installed in pressure-compounded impulse turbines to

•hold the nozzle of the stage and admit steam to moving blades

289. In the Hydropore tank, What is the device intalled to starts/stops the pump ?

•Pressure switch

290. Gas turbine has operational flexibility. Which of the following is the reason?

•Swift start up, no warm up or idling period is required.

291. What is the reason why steam pressure reduces its pressure while accomplishing work in the engine or turbine?

•The steam expands in volume

292. Before loosening pump covers how should the pressure be checked ?

•air vent valve open and clear

293. What type of engine uses a high cetane number?

•Small, high speed

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

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

296. The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the

•feedwater vapor pressure

297. A reading of zero on a Bourdon tube instrument generally means ?

•equal to atmospheric pressure

298. Which significant combustion elements of fuel oil is a major source of air pollution?

•Sulphur

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

300. Air trapped in the hydraulic fluid of a steering system would be indicated by:

•erratic rudder response

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