competence 5.2

50問 • 1年前

ERNO ENRIQUE JOMENTO

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問題一覧

143. When firing a boiler in local manual control, an increase in boiler load must be accompanied by alan.

increase in the forced draft air pressure before an increase in the fuel oil flow

144. In a steam propulsion plant, the primary source of auxiliary exhaust steam is from the ?.

main feed pump

145. Before performing any maintenance on a hydraulic system storing energy in an accumulator, you should.

pressurize the system to test for leaks

146. The size of flexible hose used in hydraulic system is indicated by __

the numerical designation found on the skin of the hose

147. While the oily-water separator is operating in the processing mode , if a low vacuum , what is the probable cause?

The coalescer beads are severely fouled

148. It can prevent heat damage to fuel injection nozzles by avoiding

long periods of engine overload

149. Engine room bilge water can be pumped out overboard safely by the use of which equipment listed below?

oil seperator

15. Which of the following statements is correct to ensure safety to entering a pump room?

a forced ventillation system is operational

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

gums, varnishes, and acids

151. Movement of the pump control rack in a fuel injection system using individual plunger-type pumps

varies the quantity of fuel delivered

152. What is the effect if a double suction centrifugal pump impeller has been installed in the reverse direction?

Require more power to turn the shaft.

16. In the illustrated hydraulically operated turbine gland seal regulator, the exhaust dump valve is closed as a result of the piston being actuated by alan .

spring

17. What parts of Oil Discharge monitoring and control system checked the flow rate of the oily water to be discharged is measured at the discharge pipe?

A Flow meter

18. Unbalance accumulation of sludge in the bowl can result to

vibration

19. Boiler water samples should be circulated through a cooling coil prior to analysis because

this keeps the water from flashing into steam as it is drawn from the higher pressure of the boiler to the lower pressure of the fireroom

2. While the oily-water separator is operating in the processing mode, what is the probable cause of a low vacuum?

The coalescer beads are severely fouled

20. Discharge of oily mixtures from machinery space bilges of tankers is prohibited except which of the following equipment is fitted?

Oil Discharge Monitoring Equipment

21. A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition?

A vacuum condition has developed in the reservoir

22. Which of the following actions should be taken FIRST if a bilge-well of a multiple suction bilge system is unable to be pumped out?

attempt to pump out another bilge well to determine if the entire system is affected

23. The effect of too much heating in the fuel oil of main engine is

stuck plunger and barrel

24. Air leakage into the pump casing by way of the packing gland of a condensate pump is prevented by?

a water seal line to the packing.gland

25. Marpol regulation came into effect stating that the oily water separator which was previously certified for 100 ppm be changed to:

15 ppm

26. A report when an incident takes place involving the discharge or probable discharge of oil (Annex I of MARPOL 73/78) ?

harmful substances report

27. Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure will result in

Overheating of the system or lowers the operating efficiency of the system

28. An oily water separator consist of three stages, which one of the following unit segments separated the impurities and particles?

Filter stage

29. Rows of tubes installed along the walls, floor, and roof of the furnace are called

water walls

3. Gland sealing steam is used during steam turbine operation to prevent the loss of

vacuum

30. Which of the listed boiler components is used to equalize the distribution of water to the generating, tubes and provide an area for the accumulation of loose scale and other solid matter present in the boiler water?

Water drum and headers

31. Which of the boiler components listed receives feedwater and serves as an area for the accumulation of saturated steam?

Steam drum

32. Which of the components listed prevents water from flowing back into the auxiliary exhaust line if the deaerating feed tank becomes flooded?

Check valve

33. Separator functions to separate both solid and liquid impurities of oil is known as

Purifier

34. What device is used to monitor the fuel consumption of the ship Is fuel oil system?

Flowmeter

35. Main propulsion engine lube oil sumps should be constructed

with a sloped bottom

36. The lubricating oil consumption in a running diesel engine if excessive can be caused by

excessive valve-guide clearance

37. What is the largest source of tanker pollution ?

Routine discharges during ballast and tank cleaning

38. Metallic packing rings are installed in turbine diaphragms to prevent.

interstage steam leakage along the shaft

39. When centrifugal pump is overhauled, it was found that shaft had developed grooves on it and no spare is available onboard, what action can be taken?

Machine the shaft sleeve on lathe and put back the new packing.

4. Clarifier is an oil separator use to remove

Solid particles

40. In a closed feed and condensate system, the drain from the second stage air ejector returns directly to the.

atmospheric drain tank

41. What is the reason why a centrifugal bilge pump requires priming?

Due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller.

42. A good quality oil used in main propulsion engine lubrication systems should be

resistant to permanent emulsification

43. The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that.

one valve seats upwards, while the other seats downwards

44. The purpose of the relief valve in a fuel oil service system is to .

protect the service pump from high discharge pressure

45. Which of the following types of main propulsion turbines is most likely to require a dummy piston or cylinder arrangement to counterbalance axial thrust?

Single flow reaction turbine

46. Which of the following actions should be taken to reestablish a 'blown' air ejector loop seal?

Momentarily close the valve in the loop seal line, then reopen slowly.

47. Which of the following problem is the most probable cause if an operating bilge pump is developing good vacuum, but is unable to discharge any water?

The suction strainer is clogged.

48. The ability of an oil to separate cleanly from an oil and water mixture is referred to as its?

demulsibility

49. Demulsibility of a lube oil is defined as,

the ability of oil to separate from water

5. Fuel oil penetration into the cylinder of a diesel engine is

reduced by finer atomization

50. Foot valves are primarily designed to

enable a pump and its suction line to remain primed prior to starting the pump

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