ࡱ> b  Oh+'0h  $ 0 <HPX` Question nouesnattyonattattNormalnfff45Microsoft Word 8.0@~t@;@hjbd$0Program Files 0Microsoft Office0TemplatesA ՜.+,D՜.+,8 hp|  aaM,   Question no Title 6> _PID_GUIDAN{3620968B-BE89-11D5-853E-B943462CE335}Microsoft Office0TemplatesAQ.556 If cooling water flow through after cooler is interrupted the power output of a turbocharged diesel engine will drop because the Ans. (b) density of the air shall decrease. When the water flow through the after cooler is interrupted, the air temperature increases. Automatically, the volume of the air increases and the density decreases. Hence for the same said volume, the quantity of the air from the point of view of weight, as concerned, will be always less than what it would be if the temperature was lower. Higher the temperature, the weight of the air reduces. When the weight of the air reduces, the fuel injected will not burn efficiently. Hence, there is automatically a drop in the power output of the engine. Q.557 Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in Ans. (d) carbon formation on the combustion chamber surfaces. When an engine is operated at such low loads, the turbocharger efficiency drops. When the turbocharger efficiency drops, less quantity of air is supplied to the cylinder. Hence the quantity of air available in the cylinder for combustion is reduced. This will automatically reduce the quantity of fuel which is burnt. At the same time, the fuel will not burn efficiently. Thus formation of unburnt fuel will lead to carbon formation and the combustion chamber surfaces will get coated with the carbon deposits. Q. No. 558 Diesel engine fuel oil contamination often results in Ans. B. Fuel injection system malfunction. The fuel oil of diesel engine will get contaminated with water or with solid particles such as silica, rust, or alumina, all these three components will result in improper functioning of the fuel combustion injection equipments. Because of the water there will be rusting or there will be lots of misfiring in the combustion stroke. Also if there is a hard particle silica, alumina present, then it will give abrasion on the needle and guide and cause the leakage of fuel. Any catalysts and fines that can enter in the clearance spaces of parts of fuel injection equipments can lead to accelerated wear of those parts. The wear may be extensive with few days of operation with contaminated fuel. Also it will block the injection holes on the nozzle and cause the complete malfunctioning of the fuel injection system. Q.No.559 Operating a diesel engine under light load and at lower temperatures for extended period can result in Ans. a. Formation of carbon on the inlet and exhaust valves. When the engine is operated at low load and low temperature for a longer time, in such conditions the turbocharger efficiency drops and when the turbocharger efficiency drops, the quantity of air supplied to the engine reduces and because of this improper combustion takes place and hence large amount of carbon formation takes place in the combustion chamber. When running at low load, the exhaust gas pressure and exhaust gas energy are not sufficient hence there will be back pressure exerted on the exhaust and during that time if the same overlap between exhaust and inlet valve is maintained, then when the inlet valve opens the exhaust pressure is not sufficiently dropped and during this time exhaust pressure is not sufficiently dropped, under such circumstances momentarily there will be back flow of exhaust gas from the cylinder into the air inlet valve, before the actual flow of the inlet air to the unit starts, during this time the formation of carbon takes place in the air inlet valve. Q.No.560 Which of the conditions listed occurring in the diesel engine would cause carbon deposits to develop in the piston ring belt. Ans.D. all above. Faulty combustion, Excessive ring temperatures, Over-lubrication. The carbon deposits developed in the piston ring belt because of Improper combustion will cause the improper combustion of fuel and because of that the carbon will get deposited. Excessive ring temperatures, if the ring temperatures are excessive then the lubricating oil will get burned and that will also lead to the formation of carbon. Over lubrication, the excessive lubricating oil that is supplied will get burned on the piston ring and will convert into ash or carbon thus forming the excessive coating of the carbon on the ring. Q. No. 561 If a crankcase explosion occurs in a diesel engine which of the listed action should be taken . Ans: C. Allow the engine to cool before opening the crankcase. There will be two kinds of crankcase explosion. One is a primary explosion and the other is secondary explosion. When the primary explosion takes place because of the oil mist and the appearance of hot spot in the crankcase, there is a high pressure rise in the crankcase which is released into the engine room atmosphere with the help of crankcase relief valves and at the same time the non-return valve will shut and not allow the new air to enter into the crankcase. There the crankcase atmosphere will be highly rich and hence there is a less possibility of exposure but under such circumstances if the by mistake the crankcase door is opened in such circumstance the fresh air will enter the crankcase and bringing the crankcase atmosphere in the range of explosive limit and when this thing happens there will be heavy explosion and a secondary explosion may take place. So the best thing to do is to allow the engine to cool down before opening the crankcase doors. Q.No.562 The burning of fuel oil in a diesel engine having a high sodium content will cause Ans. Corrosion and Grooving of exhaust valves. In general, fuels leaving the refinery have sodium content well below 50mg/kg. If the sodium content increases, which is normally caused due to seawater contamination. A 1% seawater contamination represents a potential 100mg/kg increase. Vanadium is also present in the fuel oil, which combines with oxygen to form V2O5 (vanadium pent oxide), which combines with sodium to form sodium/vanadium complexes. It is well known that there are low melting temperatures of sodium/vanadium complexes of certain critical ratios. The most critical Na-V ratio is about 1 to 3. This will form a sodium/vanadium complex with a low melting point which will flow with the exhaust gases and it will get deposited as a hard and brittle layer on the cold surfaces such as exhaust valve spindles, turbocharger nozzles and turbine blades. This layer is highly corrosive and corrodes the metal. It is also brittle and breaks away exposing the metal for fresh attack. Especially when they get deposited on exhaust valve seats and when the hard layer breaks and gives a cutting effect on the seat. Preventive measures can be taken such as keeping the temperature of the exhaust below the melting point of V2O5 and removal of Na by proper purification and proper draining of the settling tanks. Therefore high sodium content in the fuel oil will result in corrosion and grooving of exhaust valves. Q. No.563 The longer the ignition delay period resulting from improper use of low cetane fuel, the Ans. More rapid the rise in the combustion pressure. Longer the period of ignition delay the more quantity of fuel will accumulate before the actual firing will take place and because of that there will be sudden increase in the combustion pressure, when the large quantity of accumulated quantity of fuel will ignite there will be sudden development of the high pressure wave. At the same time if the ignition delay is too much in that case there will an afterburning effect and when afterburning effect will take place there will be high enforced temperature. Q.No.564 If the relief valve on the diesel engine cylinder lifts, the cause could be due to Ans: A Liquid in the cylinder. When there is a liquid in the cylinder and the piston is moving upward because of the presence of liquid there will hydraulic pressure will develop and as the liquid is incompressible a large amount of hydraulic pressure will develop and in order to save the engine components form damage the relief valve will lift and will release the pressure. Q.No.565 The substantial increase in the crankcase pressure could be an indication of Ans:C a worn cylinder liner. When the pressure in the crankcase of a diesel engine increases it could be an indication of blow-by past the piston, which could be due to worn out cylinder liner or the piston rings are leaking or piston rings are broken in that case of large amount of high pressure gas will enter into the crankcase and it will produce a high pressure in a crankcase. Hence the substantial increase in the crankcase pressure could be an indication of a worn out cylinder liner. Q.No.566 An indication of an overloaded main propulsion engine. Ans. B: High exhaust pyrometer readings. As a general rule the exhaust temperature is related with the load of the engine higher the load higher the exhaust temperature of the engine. Hence it is the direct indication of the load on the engine. Hence if the exhaust temperature is higher, then the engine is overloaded. Q.No.567 The dry-type exhaust silencer clogged with soot will cause Ans. B: Loss of engine power. When the dry-type exhaust gas silencer gets clogged with soot, there will be large amount of exhaust gas to flow and because of that the exhaust gas pressure will be higher and hence the complete removal of exhaust gas will not be possible which will cause the mixing of the exhaust gas with the incoming air and thus diluting the incoming air with the exhaust gas. This will cause improper combustion because of the starvation of the oxygen for the combustion of the fuel. The exhaust temperatures will increase and consequently there will be loss of powering the engine. Q.No.570 The colour of the exhaust from the diesel engine should be Ans: A Clear. The clear colour of the exhaust gas from the engine exhaust will indicate the best possible combustion without any carry over of the fuel, lubricating oil, water in the fuel or the improper combustion. So it should be noted that the colour of the exhaust indicates the health of the engine or any defects in the combustion. If the colour of the exhaust is black it indicates improper combustion that may be due to some fuel system malfunctions or an overloaded engine. If the colour of the exhaust is white it is consists of water. If the colour of the exhaust is bluish then it indicates the burning of lubricating oil in the engine. So the clear exhaust is an indication that the combustion is perfect. Q.No.571 Engine operating conditions maybe indicated by the colour of the exhaust smoke. Black smoke could indicate. Ans:B . An overloaded engine. If the engine is overloaded beyond particular limit than in that case the quantity of the fuel will be more but comparatively the quantity of the air will be less and not only that the larger quantity of fuel which is injected into the unit will be difficult to burn in a allotted time and hence after burning it will increase the exhaust temperature and black smoke will be formed. Q.No.572 Restricted air intact to a diesel engine may result in Ans: A. engine failing to reach the rated speed. When the air intact to the engine is restricted automatically the fuel will not burn properly and hence power generated by the engine will be less and when the power generated by the engine is less it may be possible that it will fail to reach the rated speed at a lower condition. Q.No.573. Colour of engine exhaust form diesel engine should be Ans: A. clear as it is already been discussed in Q.No.570. Q.No.574 With regards to diesel engine crankcase explosion most violent is the_____ I ) Secondary explosion II ) Primary explosion. Ans: B. II only. V   8 \d8yuvwx/"O"$!$5&^&v''']*l*--//11M11110@ABCCC FHIIILLM*B*5\X  7 8 A \d8y & F  X  7 8 A \d8yHI578!!/"P"##$!$%%5&^&u'v'''***]*l*.-/---D/E///001L1M1111       IyHI578!!/"P"##$!$%%5&^&u'v'''***]*]*l*.-/---D/E///001L1M1111>jXlp 1h/ =!"#$%Q.558 Ans. (b) fuch as silica, rust, or allumina. A,will be rusting andthere is a hard particle, silica orl, present entering the clearance spaces of part lead to accelerated wear of theoles on the nozzle and causeitical sodium/vanadiumout 1:low with the exhaust gases. Ing the metal for fresh attack e on exhaust valve seats. T and removal of sodiums. D,Q.558 Ans. (b) fuch as silica, rust, or allumina. A,will be rusting andthere is a hard particle, silica orl, present entering the clearance spaces of part lead to accelerated wear of theoles on the nozzle and causeQ.559 () f longer time,bocharger efficiency drops. W. This results inimproper combustion . Hbackpressure exerted on the exhaust. I is maintainedst and inlet valve is maintained during that time,is not sufficiently dropped. U,l be back-linder into the air inlet valvehe inlet air to the unit starts. D,Q. Ans. (d) all above i.e. fion, excessive ring temperature, oThe carbon deposits develops: Tresults in carbon being deposited.Excessive ring temperature: If, then lubricating oil will get burnt whichs: Tto the piston ring will get burnt andQ. Ans.(cQ.558 Ans. (b) fuch as silica, rust, or allumina. A,will be rusting andthere is a hard particle, silica orl, present entering the clearance spaces of part lead to accelerated wear of theoles on the nozzle and causeQ.559 () f longer time,bocharger efficieYZ[[[^^_<___`aaTcncfk kPk4m:moooo^pr6rJrrrrVtt*5B*5# (i) s. (ii) pAns.(b) (ii)Q.558 Ans. (b) fuch as silica, rust, or allumina. A,will be rusting andthere is a hard particle, silica orl, present entering the clearance spaces of part lead to accelerated wear of theoles on the nozzle and causeQ.559 () f longer time,bocharger efficiency drops. W. This results inimproper combustion . Hbackpressure exerted on the exhaust. I is maintainedst and inlet valve is maintained during that time,is not sufficiently dropped. U,l be back-linder into the air inlet valvehe inlet air to the unit start)wo kinds of crankcase explosion; oneimary explosion and otherthe of crankcase relief valves. A, enter into the crankcase. T. Under such circumstances if, enter the crankcase and bring. 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A,will be rusting andthere is a hard particle, silica orl, present entering the clearance spaces of part lead to accelerated wear of theoles on the nozzle and causeQ.559 () f longer time,bocharger efficiency drops. W. This results inimproper combustion . Hbackpressure exerted on the exhaust. I is maintainedst and inlet valve is maintained during that time,is not sufficiently dropped. U,l be back-linder into the air inlet valvehe inlet air to the unit starts. D,Q. Ans. (d) all above i.e. fion, excessive ring temperature, oThe carbon deposits develops: Tresults in carbon being deposited.Excessive ring temperature: If, then lubricating oil will get burnt whichs: Tto the piston ring will get burnt andQ. Ans.(c)wo kinds of crankcase explosion; oneimary explosion and otherthe of crankcase relief valves. A, enter into the crankcase. T. Under such circumstances if, enter the crankcase and bring. When this ,Q. Ans. corrosion and g (vanadium pentl ratios. The most cr.>?[AKLy|+-12 %&*;<KLFHWtlnqr7F+1XY^_\]cders abn}ncy drops. W. This results inimproper combustion . Hbackpressure exerted on the exhaust. I is maintainedst and inlet valve is maintained during that time,is not sufficiently dropped. 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Question nonattyfff [8@8 NormalCJ_HaJmH sH tH 2@2 Heading 1$@&5\   Yy]*11BKOR$)}%%((**1,4,,, -QZlv~T]')""%%((,, -HARISHD:\Satish\books\A004.docHARISHD:\Satish\books\A004.docHARISHD:\Satish\books\A004.docHARISHD:\Satish\books\A004.docfff,C:\WINDOW\TEMP\AutoRecovery save of A004.asdfff+C:\WINDOW\Desktop\samant\wordfiles\A004.docfff+C:\WINDOW\Desktop\samant\wordfiles\A004.docfff+C:\WINDOW\Desktop\samant\wordfiles\A004.docfff+C:\WINDOW\Desktop\samant\wordfiles\A004.docfff+C:\WINDOW\Desktop\samant\wordfiles\A004.doc1,2 )wo kinds of crankcase explosion; oneimary explosion and otherthe of crankcase relief valves. A, enter into the crankcase. T. Under such circumstances if, enter the crankcase and bring. When this ,Q. Ans. corrosion and g (vanadium pentl ratios. The most critical sodium/vanadiumout 1:low with the exhaust gases. Ing the metal for fresh attack e on exhaust valve seats. T and removal of sodiumQ mhe period of ignition delay, s.(As a result) ease in the combustion pressure. Wtity of accumulated fuels, there is athe high-, there will afterburning. When afterburning effect s,Q. lifts, the cause could beAns. (a) l is a liquid in the cylinder, the piston is moves. Hbecause of the presence of liquid. Asessible,ised. 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Ans. (c), it could indicate blow-by past the piston. This could . In that casehigh-pressure into the crankcase and produceQ. Ans. (b). H,Q. Ans. (b) l. H. Tit es inQ. The coloAns. (a) c The clear colong oil, water in the fuel or,,,cating oil in the engine. SoQ. Ans. (b) aaded beyond particular limit then,. Hence t will be difficult to burn inso- will occur. ThisQ. Restricted air intake. (a)When the air intake,. H. When,Q.573 ColoAns. 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