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Maritime Forum

Topics in Category: Steam &Motor

emo
Views: 133
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 24 Mar 2017 07:44 by PMA-3777
(a) Describe three methods of reversing a main engine. (b) Explain what is meant by lost motion.
anandgardener's Avatar
Last Post by anandgardener 08 Jun 2017 00:36
For reversing the Main engine first the engine has to be started in reverse firing order, this is achieved by the changing the cam direction in the mechanical pilot air distributor of the main engine, which is done by the engine's pneumatic system on receiving the appropriate Signal from Engine...
emo
Views: 113
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 24 Mar 2017 07:42 by PMA-3777
(a) Explain the meaning of term Supercharging and state how it is achieved. (b) Explain the meaning of term Turbocharging and state how it is achieved. (c) How would you ascertain if the following components become fouled: 1. Charge Air Inter coolers 2. Air take suction filters
anandgardener's Avatar
Last Post by anandgardener 07 Jun 2017 23:31
a) Supercharging means, increasing the density of the air which is inhaled by the engine. This means more air is taken by the engine and thus more fuel can be burnt inside it, thus producing more power. Supercharging can be achieved by putting a separate air compressor which could be electric motor...
emo
PMA-3777's Avatar
Topic started 24 Mar 2017 07:37 by PMA-3777
With reference to shutting down a main propulsion engine diesel plant after a deep sea voyage: (a) State the actions to be taken by EOOW when transferring from bridge control to ER control just prior to shut down. (B) State four precautions to be taken after shutdown in order to ready the main...
anandgardener's Avatar
Last Post by anandgardener 07 Jun 2017 23:14
1) Transferring of the Engine command is to be done only after FWE(finished with engine) has been conveyed to Engine room from bridge i.e. the bridge do not require the Main engines any more and the Main engine plant can be shut. Second after transferring the control to Engine room, the engines...
emo
Views: 105
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 24 Mar 2017 07:26 by PMA-3777
(a) Describe why it is necessary to keep the cooling water within certain parameters and the action to be taken to rectify an abnormal reading. (b) Describe using sketch to illustrate your answer, the principle of centrifugal separation as used in fuel and lubricating oil purifiers.
anandgardener's Avatar
Last Post by anandgardener 05 Apr 2017 08:51
(a) The cooling water temperature of an engine is to be kept within a certain range for following reasons: 1. To maintain the efficient combustion, the cylinder's temperature has to be kept above 80 deg. Celsius.Excessive low temperature of cooling water will lead to heat loss and thus lower the...
emo
Views: 127
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 24 Mar 2017 07:20 by PMA-3777
(a) Sketch a cross section of gear pump suitable for use with fuel or lubricating oil indicating the flow of fluid through the pump. (b) Explain the operating principle of gear pump.
anandgardener's Avatar
Last Post by anandgardener 27 Mar 2017 13:50
(a) [image] (b) operating principle: As shown in image above there are two meshing gear inside the casing. One gear is driven from external power, while the other is driven by that gear. As the external rotary motion is applied both the gears...
emo
Views: 86
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 22 Mar 2017 04:44 by PMA-3777
(a) List FOUR safety or alarm devices fitted to an automatically controlled auxiliary boiler describing how each of these devices may be tested. (b) Make a simple sketch of water level gauge. (c) State the possible cause, and outline the remedial action that should be taken when each of the...
anandgardener's Avatar
Last Post by anandgardener 27 Mar 2017 05:08
(A) Four safety devices fitted in the Boiler and their working: 1. Water low-low alarm: This is independent to the water level controlling system in a boiler and it activates a separate electrical relay which activates the main relay for deactivating the contactor of the Burner. Thus this device...
emo
Views: 78
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 22 Mar 2017 04:30 by PMA-3777
(a)State the name of the equipment used to give warning of the presence of conditions that could lead to an explosion in the crankcase of a diesel engine. (b) Sketch and describe the device used to relieve excess pressure that might develop as a result of a crankcase explosion of a diesel engine.
anandgardener's Avatar
Last Post by anandgardener 25 Mar 2017 15:13
(a) The Oily Mist Detector is the equipment used to give warning of the presence of conditions that could lead to an explosion in the crankcase of a diesel engine. (b) Explosion door is used to relieve excess pressure that might develop as a result of a crankcase explosion of a diesel engine, is...
emo
Views: 83
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 13:44 by PMA-3777
(a) In the case of Main Engine and CPP not responding to the bridge control, describe the routine for changing to engine room control? (b) Explain how manual control of fuel pump delivery is achieved when emergency manoeuvring on a large 2 stroke cross head engine.
anandgardener's Avatar
Last Post by anandgardener 25 Mar 2017 15:06
(a) In case of Main engine in either FPP(fixed pitch propellor) or CPP, not responding to the Bridge control, the control needs to be transferred in Engine control room or at Emergency control. When transferring to ECR, the governor is still in command of ME. This is achieved by just switching the...
emo
Views: 81
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 11:00 by PMA-3777
Sketch a simple cross section through an air starting valve of a marine diesel engine.
anandgardener's Avatar
Last Post by anandgardener 24 Mar 2017 14:27
[image]
emo
Views: 87
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 10:22 by PMA-3777
(a) With the aid of sketch describe the operational principles of a main engine exhaust gas turbocharger. (b) State the function of following turbocharger components. 1. Suction filters 2. Exhaust Grids 3. Charge Air Coolers
anandgardener's Avatar
Last Post by anandgardener 24 Mar 2017 14:13
(a) Construction of turbocharger:- [image] 1.)The turbocharger consists of a single stage impulse turbine connected to a centrifugal impeller via a shaft. 2.)The turbine is driven by the engine exhaust gas, which enters via...
emo
PMA-3777's Avatar
Topic started 21 Mar 2017 10:17 by PMA-3777
(a) Explain the sequence of events that occur on pressing the start button of an automatically controlled oil fired package steam boiler. (b) State THREE reasons why the boiler in (a) would automatically shut down during the starting sequence.
anandgardener's Avatar
Last Post by anandgardener 24 Mar 2017 13:59
(A) Auto start sequence of Boiler: 1. Air Purging will start by boiler. 2. The fuel oil will circulate through heater and comes to required temperature. 3. After purging for nearly 3 minutes, the Electric ignitor will charge. 4. The electric ignitor will make arc and the air damper will come to...
emo
Views: 81
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 10:13 by PMA-3777
With reference to large slow speed diesel engines, for each of the following .State FOUR actions to be taken by EOOW on discovering: (a) a scavenge fire in one engine unit only. (b) a scavenge fire in several engine units at the same time.
anandgardener's Avatar
Last Post by anandgardener 24 Mar 2017 13:47
(A) Action to be taken for scavenge fire in one engine unit only :- 1. Inform bridge and chief engineer 2. Reduce engine rpm with consultation of bridge. 3. Increase the feed rate of Cylinder lub oil of that unit. 4. Close the drain of the Scavenge. 5. Follow the remedial action of troubleshooting...
emo
Views: 72
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 08:30 by PMA-3777
(a) Describe the actions to be taken by EOOW on discovering a scavenge fire. (b) State TWO dangers of allowing a scavenge fire to exist.
anandgardener's Avatar
Last Post by anandgardener 23 Mar 2017 16:27
(A) 1. Inform wheelhouse and Chief engineer. 2. Reduce main engine rpm with consultation of wheelhouse. 3. Increase Cylinder oil feed rate of the unit where scavenge fire is happening. 4. Close the Scavenge drain 5. Monitor the unit's scavenge space for its temperature. 6. Take further action like...
emo
Views: 76
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 08:27 by PMA-3777
State the effect of auxiliary boiler operation in the event of the following alarm conditions: (a) high water level (b) low water level (c) extra low water level 2) How often should a low pressure boiler gauge glass be blown down.
anandgardener's Avatar
Last Post by anandgardener 23 Mar 2017 16:21
1 (A) High water level : The boiler water feed pump stop pumping water in boiler and Boiler burner keeps operating normally. (B) Low water level : The boiler water feed pump starts pumping water in boiler and Boiler burner keeps operating normally. (C) Extra Low water level: The boiler water feed...
emo
Views: 90
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 08:12 by PMA-3777
With reference to the fuel injection timing of a 2 stroke diesel engine, what would be the effect of: (a) Early Injection (b) Late Injection 2) Sketch an OUT OF PHASE (draw card) for a 2 stroke diesel engine and indicate the point of fuel injection. 3) Explain why the simultaneous injection of...
anandgardener's Avatar
Last Post by anandgardener 23 Mar 2017 16:11
1) (A) Early injection: Early injection can be caused by incorrect fuel timing, broken or wrongly set up fuel injector, incorrect fuel condition, overheating of parts around the combustion space. Its effect is to increase the maximum cylinder pressure. There will be an increase in combustion...
emo
Views: 68
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 08:08 by PMA-3777
With reference to centrifugal fuel oil separator: (a) Explain the importance of using correct size of gravity Disc. (b) State the TWO factors that determine the size of Gravity disc to be used.
anandgardener's Avatar
Last Post by anandgardener 23 Mar 2017 15:09
(a) Purifiers have great role in ship's fuel system.It is a ring fitted at the top of disc stack from where water is passing out and is called gravity disc. Oil which is for purification may not be of same type every time, it is of different densities or viscosity, so the interface change, which...
emo
Views: 81
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 05:25 by PMA-3777
(a) Describe the sequence of actions when preparing main engine for sea. Assume that the engine has been shut down for a long period of time. (b) Describe how the engine plant is prepared from a cold condition to that of a condition ready for maneuvering . (c) State the tests that need to be...
anandgardener's Avatar
Last Post by anandgardener 23 Mar 2017 05:00
Questions A & B has same answers as following: #Have a visual check all around the engine. # Start the engine l.o.pump; engage turning gear and turn the engine ensuring indicator cocks are open. # J.c.w. heating should be on ensuring the engine is warmed through circulate by a circulating pump....
emo
Views: 60
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 05:21 by PMA-3777
(a) State FOUR reasons for a reciprocating compressor taking too long to fill the main air starting bottles. (b) State FOUR safety devices fitted to the air starting system including air compressor of a large marine diesel engine.
anandgardener's Avatar
Last Post by anandgardener 22 Mar 2017 14:31
(a) 1. Defective suction discharge valves. 2. Worn piston rings. 3. Choked suction air filters. 4. Relief valve is lifting. (b) 1. Relief valve in the discharge line of the air compressor. 2. Relief valve in the air bottle. 3. Bursting disc in the starting line of each cylinder of the Engine. 4....
emo
Views: 58
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 05:14 by PMA-3777
(a) State FOUR possible reasons for the boiler feed pump failing to maintain the water level in an auxiliary boiler. (b) Upon rectification of the fault (a) describe the startup sequence of the boiler (c) State the actions to be taken by EOOW when a boiler alarm is activated.
anandgardener's Avatar
Last Post by anandgardener 22 Mar 2017 14:23
(a) 1. Vapour lock in the Boiler feed pump. 2. Pump's clearance has increased. 3. Pump's suction filter has choked. 4. The boiler water level control system is malfunctioning. (b) Upon rectification of the above faults and if the boiler was stopped for long time then the boiler should be started...
emo
Views: 40
Replies: 1
Topic List
PMA-3777's Avatar
Topic started 21 Mar 2017 05:09 by PMA-3777
State FOUR conditions which would result in the fuel supply to burners of an auxiliary boiler being automatically cut off, giving a reason why EACH circumstance requires the fuel to be cut off.
anandgardener's Avatar
Last Post by anandgardener 22 Mar 2017 14:03
Conditions which would result in the fuel supply to burners of an auxiliary boiler being automatically cut off are following: 1. Burner door interlock activation:- this indicates that burner door has opened and to prevent fire to escape out of boiler, the fuel is cut-off. 2. Boiler water very Low...
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