competence 4.8

57問 • 1年前

ERNO ENRIQUE JOMENTO

通報

問題一覧

351. The functional difference between a 2-stroke and a 4-stroke cycle engine is in the number of ?

•piston stroke needed to complete a combustion cycle

352. A turbocharger is an air compressor driven by ?

•engine exhaust gases

353. Refrigerant is circulated through a refrigeration system by the ?

•compressor

354. For proper combustion where the ratio of fuel oil and air is necessary, the term stoichiometric mixture means ?

•More fuel, less airÂ

355. An unloader is installed on an air compressor to

•remove the compression load as the compressor comes up to speed during starting

356. Settling tanks are part of the fuel oil system used for

•heating to allow sediments and water to settle down

357. Calculate the friction power of the engine with indicated power output of 190 hp and shaft power of 162 hp

•28 hp

358. Where can you find the refrigerant sight glass of a multi - box refrigeration system?

•After the receiver in the liquid line

359. Short cycling of a refrigeration compressor refers to ?

•frequently starting and stopping

360. In a diesel engine, an integral liner is one in which the cooling water_____ I.flows through the cylinder liner jackets II. Touches the outer side of the liner

•flows through the cylinder liner jackets

361. When an engine coupled with the large vibrational shocks that act on the shaft, and there could be permanent damage to the propeller shaft and Why?

•Due to intermediate shaft weight

362. A hydraulic actuator is a device that uses hydraulic energy coming from a hydraulic pump and produces linear mechanical power. What component of the device that produces linear

•Hydraulic cylinder

363. What will happen to a diesel engine if air is present in the fuel lines leading to the fuel injection nozzle ?

•failure to start

364. The oil scraper ring of a 4-stroke engine piston is installed at this part.?

•Lowest ring

365. Increases in rotor clearance in a rotary pump will ?

•decrease pump cavitation

366. What will happen if the fuel injected too early in the injection cycle?

•Early detonation and loss of power

367. In an electro-hydraulic steering gear, any change in relative position between synchronous receiver and the follow-up gear will result in

•a corresponding slowing or increasing of the pumped flow rate

368. In order to recognize the amount of anchor chain paid out, specific portions of the chain are color coded and wrapped with wire. The first shot of chain is painted ?

•red on the detachable link and white on each link to either side of the detachable link

369. Which of vthe following is the possible cause of fluctuating steam pressure of atomizing steam system is ?

•malfunctioning of steam traps in the atomizing steam

370. One of the main functions of wearing rings, as used in a centrifugal pumps, is to

•allow for economical replacement of worn internal pump components during regular overhaul maintenance

371. What esult will be achieved in maintaining fuel oil temperature properly ?

•improved atomization

372. In a refrigeration system, the amount of refrigerant admitted to the evaporator is directly related to

•the superheatof the refrigerant in the tail coil

373. The degree of fuel atomization in a diesel engine cylinder depends primarily on

•the size of the holes in the fuel nozzle

374. An electric motor failure in an electro-hydraulic steering gear system would cause the rudder to

•remain locked in its last position

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

•heating of the air leaving the cylinders

376. Carbonization in the surface of the fuel oil heater will reduce the heating capacity because ?

•fluid film covers the surfaces reducing the heat transfer

377. How is dissolved oxygen in boiler feed water minimized ?

•Maintain high feed water temperature

378. Which of the following components are directly connected to the propellers and lies mainly encased in the stern tube?

•Tail shaft

379. Proper atomization of fuel in diesel engine combustion chambers will

•improve combustion

380. Which of the following is a function of burner atomizing steam?

•impart swirling motion of the oil for efficient combustion

381. As the pump speed increases, what will happen to NPSH (Net positive suction head)?

•NPSH increases

382. The best action to do if the main engine slows down and the cause is not detected immediately is to?

•inform bridge immediately

383. What is the means of removing the heat of condensation from the refrigerant in a normal refrigerating cycle?

•Condensing the refrigerant in the system condenser

384. The shaft coupling for the gear pump is prevented from rotating on the shaft by a ?

•key.

385. One advantage of a vacuum feed sight glass indicator used on cylinder lubricators over the discharge side liquid filled type sight glass is ?

•adjustments are not required

386. After changing out the fuel filters, the diesel engine fails to restart. What could be the probable cause ?

•Air-bound fuel system

387. A recirculating, or bleed off line is installed on a centrifugal pump in order to ?

•prevent the pump from overheating when operating at shutoff head

388. What type of pump is used in the steering gear of modern ships?

•Vane

389. An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of?•producing a smoother discharge flow

•producing a smoother discharge flow

390. If a centrifugal pump operating with a positive suction head vibrates, or becomes noisy, the cause could be

•insufficient venting

391. In refrigeration system, the heat normally producing the flash gas at the thermostatic expansion valve, is obtain from

•the portion of liquid refrigerant which doesnot flash

392. Prior to departure what preparations are required regarding pistons and cylinder liners of a diesel engine?

•Preheat cylinders and pistons turn engine turn cylinder lubricators

393. What needs to be done in order to maintain the gas turbine sustainable power output

•Compressor washing

394. If a leak is suspected in a tube heat exchanger what should be checked FIRST-?

•Tightness of flared tube end

395. Where is the temperature of the refrigerant highest?

•At the compressor discharge.

396. Clearances between the impeller hub and casing of a centrifugal pump are checked with the use of

•an accurate set of feeler gages

397. While making engine room sounds at sea, you observe excessive steam leaking from the forward gland on the high pressure turbine . This may indicate that the

•gland seal leakoff line is obstructed

398. As per regulations electric and electro-hydraulic steering gear motors are required to be,

•served by two feeder circuits

399. How does fuel oil atomizers function in boilers?

•By breaking fuel oil into a fine spray,

400. In a hydraulic system, an O-ring seal will begin to leak when it has lost its interference fit due to which of the fololowing ?

•compression set or wear

401. What will be the result io proper atomization of fuel in diesel engine combustion chambers ?

•improve combustion

402. Liquid is kept from leaking out of the shaft ends of a helical gear pump by.

•a stuffing box

403. Which of the following is the direction of the recirculating valve of a boiler return flow of fuel system when firing a cold boiler?

•Fuel direct back to the suction valve of the service pump

404. The high pressure side of the refrigeration systems starts from the ?

•compressor to the expansion valve

405. If a centrifugal pump gradually develops insufficient discharge pressure as a result of worn wearing rings, which of the following corrective actions is required?

•Replace the rings

406. An air-compressor can be unloaded at start up by ?

•relieving the intercooler pressure to the atmosphere

407. What is the importance of the control box of a differential gear system in steering gear system?

•It compares the bridge signal to the actual rudder angle through the follow up gear

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