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Epariksha

A scavenge fire in a slow speed engine can lead to several damages including a crankcase explosion, deformation of the diaphragm plate, and damage to tie rods. When using low sulfur fuel oil in emission control areas, the TBN of the cylinder oil ideally should be higher than normal to prevent corrosion. On a two stroke engine, the top o-ring on the liner seals the jacket cooling water while the lower o-ring seals the scavenge air.

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210 views2 pages

Epariksha

A scavenge fire in a slow speed engine can lead to several damages including a crankcase explosion, deformation of the diaphragm plate, and damage to tie rods. When using low sulfur fuel oil in emission control areas, the TBN of the cylinder oil ideally should be higher than normal to prevent corrosion. On a two stroke engine, the top o-ring on the liner seals the jacket cooling water while the lower o-ring seals the scavenge air.

Uploaded by

dkpushpdk
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Which of the following statements is true, about slow speed engines? A.

A scavenge fire can lead to a crankcase explosion B.A scavenge fire can lead to deformation of diaphragm plate C.A scavenge fire can lead to damage to tie rods. D.All of the above. 2) When using low sulfur fuel oil for Emission Control Areas (ECA???S), ideally the TBN of the cylinder oil used should be: A.Lower than normal B.Higher than normal C.Same as normal D.Same as normal if the feed is kept higher 3) For a two stroke engine two o-rings are provided on the liner. The function of the top o-ring is to ___________ and function of the lower o-ring is to ____________ A.Seal jacket cooling water, act as secondary seal in case 1st o-ring leaks B.Seal jacket cooling water, Seal scavenge air C.Seal scavenge air, Seal Jacket cooling water D.Seal combustion gases, Seal jacket cooling water 4) The coating which is provided on the valve stem of exhaust valves of modern marine diesel engines is of: A.Nickel B.Stellite C.Chromium D.Nimonic 5) If the combustion control system of an automatically fired auxiliary boiler fails to sustain burner ignition after a normal shutdown, you should check for a/an A.faulty photocell detector B.low steam pressure C.high voltage on the ignition electrode D.open air damper 6) What do you mean by surge limit of a turbocharger ? A.Characteristic curve of a turbocharger B.Portion of compressor characteristic curve which lies on the left side of the point of maximum pressure C.A line joining all the points of maximum pressure on compressor characteristic curves , drawn at various speeds of operation D.Maximum rpm limit of T/C above which surging will start 7) A large, low-speed, main propulsion diesel engine uses sea water to directly cool the A.cylinder heads B.exhaust valves

C.scavenging air D.injectors 8) Exhaust Grouping is required in case of ______________ turbocharging in order to _____________________ A.Constant pressure , prevents shockwave generation B.Pulse pressure , prevent interference with scavenging of other cylinders C.Constant pressure, prevent interference with scavenging of other cylinders D.Pulse pressure , prevents shockwave generation 9) Function of a de-superheater is to : A.Protect superheater from overheat B.Control superheater steam outlet temperature C.Increase the efficiency of the boiler D.Reduce steam temperature for auxiliary uses after steam superheater 10) Which of the following statements is false? A.Oxidation of lubricant leads to decrease in its viscosity B.Formation of oxidation acids, sulfuric acid leads to depletion of TBN of lubricant C.Contamination with water will lead to decrease in the load carrying capacity of a lubricant . D.Build up of insolubles will lead to increase in viscosity of a lubricant

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