- Which of the following will lead to automatic stopping of IG blower?
a. Low water level in deck water seal.
b. Oxygen content above 8%.
c. Low water level in scrubber tower.
d. High water level in scrubber tower.
Answer-A & C
(NOTE-this type of Question also asked in which may be two or more than two will be the right Answer in that case you have to choose the most Appropriate One)
Q-Which of the following will be required to be done in order to reduce sulphur corrosion of Main Engine componentsA. Increasing the atomization pressure of fuel injectors
B. Fitting exhaust valves with valve rotators
C. Running engine at or near normal sea load
D. Decreasing the F.O. purifier feed rate , running two purifier in series one acting as purifier and other as calrifier
Answer-C
Q- Viscosity of fuel oil used for ME was 145cst,new fuel comes whose viscosity was more than earlier, what should u do
a) increase temp setting
b) change setting of viscotherm
c) do nothing
d) open steam valve manually more
Answer-Critical Question(it could be anything)
Q- Main engine is running but viscosity of fuel cannot be maintained.fuel oil heater have a maximum rating of 4 bar steam pressure.steam through a pressure reducing valve is provided to the heater at 4 bar but still viscosity of fuel annot be brought down below 20 cst. as a good marine engineering practice what will you do?
a. let the engine run at same rpm n wait for the port to come to carry out the cleaning of heater
b. reduce the rpm till next port arrives n then clean the heaters
c. increase the steam pressure by adjusting the setting of steam reducing valve
d. stop the engine n clean the heaters
Answer-D
Q-When one of the M/E.F.O. heater is not in use then
A) The F.O. inlet n outlet valve should b kept shut, but steam heating valves should b kept crack open so as to keep the heater warm.
B) F.O. inlet n outlet valve should b kept shut n heating valves also should b completely shut n should b drained of any remaining F.O.
c) F.O. inlet n outlet valve should b kept crack open so that the F.O. recirculation can take place.
d) F.O. inlet n outlet valve should b kept shut while outlet valve should be left open so that
Answer-B
Multiple Choice Question
Q- Which of the following can lead to sudden stopping of a diesel engine?
A. Air in fuel supply line
B. Water in fuel supply line
C. Obstruction in air filter p>D. Water in the air filter
Answer-A,B and C
Q- In modern marine 2-stroke diesel engines, ________________ is sometimes used as a coating on the underside of the exhaust valve disc, to reduce the rate of hot corrosion
A. Monel
B. Chromium
C. Inconel
D. Cermet
Answer-C
Q- In case of modern 2-stroke, crosshead type, marine diesel engines, the cooling oil for piston crown cooling is provided:
a Through Telescopic pipes
b Through Spray nozzle provided on top of the con-rod
c Through hollow piston rod from crosshead
d Through splash cooling similar to liner lubrication
Answer-C
Q- You see white smoke coming from the ME funnel stack, this could be
a)one or more cylinders not getting enough fuel
b)too low compression pressure
c)water in fuel
d)all of above
Answer-C
Q- Primary purpose of an indicator cock
a. Remove soot exhaut gases aftr stopping the engine.
b. Take an indicator diagram aftr removing ext gases take an performance of engine.
c. Realease excess pressure
Answer-A not B(Because Primary Purpose is Blow through Before Starting an Engine)
Q- The use of ball and roller bearings in internal combustion engines is becoming more and more popular for some or all of the following
(a) The low coefficient of friction
(b) The absence of wear under favorable conditions
(c) The independence in lubrication
(d) The extreme reliability of such bearings
Answer-A
Q- how diesel engine governing limit
a. load limit
b. scav limit
c. torque limit
d. all
Answer-D
Q-The main causes of failure of the cylinder head of a large 2 stroke marine diesel engine are
(a) Excessive rigidity.
(b) Small core holes.
(c) Thin uncooled walls.
(d) Excessive rolling and pitching
(e) Excessive tightening of cylinder head nuts.
Answer-C and D
Q- New liner we are puttin a ring in skirt made of
A one piston ring
B bronze ring, multiple piece
C cast iron, single piece
D piston ring, multiple pieces
Answer-B(Because the main function for that ring is to if any misalinghment of piston so skirt will touch the liner so if u provide this wear ring it want allowed to touch liner and it is made up by soft material and even if wear ring will touch the liner it wont damage the liner)
Q- Sea water outlet temperature of LO cooler decreased while main engine load and sea water inlet temperature not changed this indicates
a.Cooler efficiency has increased
b.Cooler efficiency has decreased
c.Sea water outlet temp nothing to do with efficiency
d.The flow of sea water reduced
Answer-B
Q- Cold corrosion occurs in the middle part of the liner of main egine. What constructional features can be applied to it for reducing this.
A . no constructional feature can be applied only increase feed of cylinder oil or use a oil with high tbn and maintain jacket water temperature as high as possible.
B even after doing A there will be some corrosion which cannot be avoided so no constructional feature other wise.
C putting an insulation between dulinder liner outside and in the bores to avoid any corrosion.
D maintain low jacket water flow rate to avoid turbulence and corrosion
Answer-A
Q- liner crack indication
a. loss of water frm expansion tank
b. black smoke coming from expansion tank
c. jacket water fluacuating
d.all
Answer-D
Q- The machinery which is usually tested first once the ship reaches a dry dock is
A. Engine room crane
B. Engine room lift
C. Gantry crane for engine room
D. All of the above
Answer-D
Q- What is mixed lubrication?
A mixing additives to lube oil
B mixing of water with lube oil.
C where the lube oil film is partly eshtablished.
D where there is certain deformation in the mating surfaces and lube oil film is established.
Answer-C
Q- To reduce sulphur corrosion of main engine components
a. Run at normal load
b. Atomizing pressure of fuel
c. Rotor in exhaust valve
d. Fuel feed rate in purifier and purifier in series
Answer-A
Q- which of the following statement is true if the oil temperature is allowed to become excessively high in the heater?
a) excessive temperature will increase oil viscosity that results to poor combustion
b) excessive temperature will cause the oil to crystallize resulting in pulsating fires
c) the fuel will carbonize and its heating will be reduced.
d) the fuel will ignite even it has not reached point of ignition.
Answer-C
Q-Which of the following statements correctly describes the phenomenon of surging in a 2-stroke crosshead type engine?
A.Due to sudden increase in engine load the exhaust gases may flow back through scavenge ports causing surge
B.Due to sudden decrease in engine load the turbocharger pressure ratio drops . This causes high pressure downstream of T/C in scavenge trunk causing flow reversal of scavenge air
C.Due to sudden increase in engine load , the T/C turbine rpm may increase suddenly increasing the compressor pressure ratio to surge
D.Due to sudden decrease in engine load , the turbocharger may stall as the higher pressure downstream in exhaust system may cause reversal of flow of exhaust gases
Answer-B
Q- Exhaust grouping in main engine is for-
1 Better starting
2 No need for auxiliary blowers
3 Pure prime
4 Cost Saving
Answer-Both 1 and 2 but most appropriate is 2
Q- 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
Answer-B
Q- The temperature, at which a fuel will start to burn under given conditions, is called its, ignition temperature. This temperature varies greatly with
(a) Composition of the air-fuel mixture.
(b) Amount of excess air.
(c) Size, shape and temperature of the compression space.
(d) All the above
Answer-D
Q- In a bypass type filtering system for a medium or high speed diesel engine, the lube oil bypassing the filter
A.returns directly to the suction side of the pump
B.returns directly to the sump
C.flows to the engine bearings
D.flows through a second-stage strainer, reheater, and returns to the sump
Answer-C
Q- which of the following would normally be a consequence of retarding fuel injection timing?
a.increased maximum combustion pressure
b.decreased maximum combustion pressure
c.increased compression pressure
d.decreased compression pressure
Answer-B
Q- A very sudden rise in pressure during combustion accompanied by a metallic, hammer like sound is called knocking of the unit or detonation and usually occurs
(a) Near the end of the pressure rise after ignition of fuel charge.
(b) Just before the fuel charge is about to ignite.
(c) Immediately after the unit reaches peak pressure and before ignition of fuel charge.
(d) At any stage of the combustion process.
Answer-A
Q- Sulphur and vanadium in F.O
A.Hot corrosion
B.Cold corrosion
C.Caustic corrosion
D.Acidic corrosion
Answer-A
Q- Which of the following is an example of a solid bearing?
A. Piston pin bushing
B. Turbo-generator turbine bearing
C. Spring bearing
D. Thrust bearing
Answer-A
Q- Which of the following can be a consequence of worn scraper rings and sealing rings of a piston rod stuffing box?
A. Increased risk of scavenge fire
B. Increased risk of crankcase explosion
C. Increased Lube oil consumption
D. All of the above
Answer-D
Q- In two-stroke/cycle diesel engine, the process of scavenging begins as the
a)piston nears and passes TDC
b)early part of the upstroke
c)piston passes BDC
d)early part of the downstroke
Answer-B (Because In a 2-stroke cycle engine, the process takes place during the latter part of the downstroke (expansion) and the early part of the upstroke (compression)
Q- By raising the jacket cooling water temp to around 80c in modern 4 stroke engines serves many purposes such as
a.it eliminates the condensation of water vapour contained in the product of combustion
b.it lowers the viscosity of cylinder lube oil
c.it reduces the considerably the amt. of water that needs to be circulated
d.it increases the temp. difference btwn cooling water and the air charge to which the heat is rejected
Answer-C
Q- Presence of catalytic fines in fuel oil is significant to engineers on board because___________________________________
A.Catalytic fines tend to impair proper operation of purifiers
B.Catalytic fines lead to abrasive wear in liners , piston rings and fuel injection equipment
C.Catalytic fines necessitate increase in injection temperature
D.Catalytic fines necessitate increase in storage temperature
Answer-B
Q- Crank web deflection readings will give a positive indication of
A. worn main bearing journals
B. torsional stress deformation
C. slack thrust bearings
D. bearing shells shim dimensions
Answer-A
Q- To prevent main engine stoppage during periods of bad weather
A. Ensure lube oil level is topped up
B. Ensure over speed trip override switch set up to rough sea setting
C. Ensure reduced speed setting to prevent overload
D. All of the above
Answer-D
Q- Routine cleaning of air side of air cooler of main engine is done by:
A. Circulating fresh water
B. Circulating cold chemical solution
C. Circulating warm chemical solution
D. Circulating hot water
Answer-C
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