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Marine engineering knowledge for Class 4B MMD exam
1.
A large marine diesel main propulsion engines, speed
fluctuates all the time during the voyage. Give a report (in about 200 words)
to the chief engineer explaining the observation of various engine parameters,
during the voyage which could be indication of some fault, causing engine speed
fluctuation.
A large marine diesel main propulsion engines, speed
fluctuates all the time during the voyage. Give a report (in about 200 words)
to the chief engineer explaining the observation of various engine parameters,
during the voyage which could be indication of some fault, causing engine speed
fluctuation.
2.
Sketch an auxiliary engine starting air system,
naming the various components, and fittings in the system.
Sketch an auxiliary engine starting air system,
naming the various components, and fittings in the system.
3. A very sudden
rise in pressure during combustion accompanied by knocking of the unit or detonation usually occurs
rise in pressure during combustion accompanied by knocking of the unit or detonation usually occurs
(a) Near the end of
the pressure rise after ignition of fuel charge.
the pressure rise after ignition of fuel charge.
(b) Just before the
fuel charge is about to ignite.
fuel charge is about to ignite.
(c) Immediately after
the unit reaches peak pressure and before ignition of fuel charge.
the unit reaches peak pressure and before ignition of fuel charge.
(d) At any stage of
the combustion process.
the combustion process.
Briefly Justify Your Answer.
4. The main
requirements which a fuel injection system must fulfil are
requirements which a fuel injection system must fulfil are
(a) accurate metering
of small amount of fuel oil.
of small amount of fuel oil.
(b) control of quality
of fuel injection
of fuel injection
(c) proper timing of
the fuel injection
the fuel injection
(d) selective
distribution of the fuel in the combustion space.
distribution of the fuel in the combustion space.
State each one of the points made above are
true or false. If any point you perceive is false, state why is it so.
true or false. If any point you perceive is false, state why is it so.
5. In any marine
diesel engine, air movements inside a combustion chamber is very important.
Generally speaking, air movement helps
diesel engine, air movements inside a combustion chamber is very important.
Generally speaking, air movement helps
(a) to distribute the
fuel
fuel
(b) to mix it with
air
air
(c) to cool the
cylinder liner
cylinder liner
(d) to help in
optimising liner lubrication
optimising liner lubrication
(e) to assist
combustion
combustion
(f) to reduce after
burning
burning
(g) to reduce
combustion temperatures.
combustion temperatures.
State which of the above points are true or
false. If any point you perceive is false, state why is it so.
false. If any point you perceive is false, state why is it so.
6. An auxiliary
engine under load continuously fluctuates even with a steady load. The fault
you diagnose could be owing to
engine under load continuously fluctuates even with a steady load. The fault
you diagnose could be owing to
(a) the quality of
fuel
fuel
(b) the quality of
servicing of the governor in the last port.
servicing of the governor in the last port.
(c) the supply of
charge air
charge air
(d) the overhaul of
fuel injectors done in the last decarbonisation
fuel injectors done in the last decarbonisation
Briefly Justify Your Answer.
7. Describe the
inspection undertaken with respect to the main Diesel engines during a one-day
stoppage at a foreign port after a long period of continuous running.
inspection undertaken with respect to the main Diesel engines during a one-day
stoppage at a foreign port after a long period of continuous running.
8. The diesel driven
emergency fire pump simply refuses to start after running perfectly for a period of half an hour just before you
prepare it to restart again. State just 4 checks you would make to confirm the
cause of this problem.
emergency fire pump simply refuses to start after running perfectly for a period of half an hour just before you
prepare it to restart again. State just 4 checks you would make to confirm the
cause of this problem.
9. The exhaust
manifold of an emergency generator engine under load turns red hot. There is no
lagging on the manifold. What efforts would you make to cool down the manifold?
State clearly what could be the causes for such an occurrence.
manifold of an emergency generator engine under load turns red hot. There is no
lagging on the manifold. What efforts would you make to cool down the manifold?
State clearly what could be the causes for such an occurrence.
10.
Explain the possible reasons
for excessive lubricating oil consumption in an auxiliary Diesel engine and
state the danger, which may be associated with this defect.
Explain the possible reasons
for excessive lubricating oil consumption in an auxiliary Diesel engine and
state the danger, which may be associated with this defect.
1.
Prepare a notice for the engine room support staff
stating 10 points of caution while working in enclosed space.
Prepare a notice for the engine room support staff
stating 10 points of caution while working in enclosed space.
2.
Sketch and describe Turbo charger end bearings of any
make you know off, complete with its housing and lubrication arrangement.
Sketch and describe Turbo charger end bearings of any
make you know off, complete with its housing and lubrication arrangement.
3.
What is meant by combustion noise and mechanical noise.
How are each generated and measured. Give four typical values of noise
measurement in different parts of the engine room.
What is meant by combustion noise and mechanical noise.
How are each generated and measured. Give four typical values of noise
measurement in different parts of the engine room.
4.
Write Short notes on the following:
Write Short notes on the following:
(A)
Effect of worn out rings on oil consumption and blow by
Effect of worn out rings on oil consumption and blow by
(B)
Dry liners and wet liners
Dry liners and wet liners
(C)
Thermal loading of piston.
Thermal loading of piston.
5.
Sacrificial zinc anodes are used on the saltwater side
of diesel engine heat exchangers to _____________.
Sacrificial zinc anodes are used on the saltwater side
of diesel engine heat exchangers to _____________.
(A) reduce
electrolytic action on heat exchanger metals
electrolytic action on heat exchanger metals
(B) keep
heat transfer surfaces shiny and clean
heat transfer surfaces shiny and clean
(C) prevent
rapid accumulation of marine growth
rapid accumulation of marine growth
(D) provide
a protective coating on heat exchanger surfaces
a protective coating on heat exchanger surfaces
Briefly Justify Your Answer
6.
The fuel supply system to an automatic auxiliary
boiler, will be automatically shutdown if the boiler ______________.
The fuel supply system to an automatic auxiliary
boiler, will be automatically shutdown if the boiler ______________.
(A) salinity
is abnormally high
is abnormally high
(B) steam
demand is too high
demand is too high
(C) water
level is abnormally low
level is abnormally low
(D) feedwater
flow is low
flow is low
Briefly Justify Your Answer
7.
The crankcases of many diesel engines are kept under a
slight vacuum to _____________.
The crankcases of many diesel engines are kept under a
slight vacuum to _____________.
(A) improve
fuel economy
fuel economy
(B) increase
the air charge velocity
the air charge velocity
(C) reduce
the risk of explosion
the risk of explosion
(D) all
of the above
of the above
Briefly Justify Your Answer
8.
The rate of cylinder lubricating oil metered to each cylinder of a large, low-speed, main propulsion
diesel engine is ______________.
The rate of cylinder lubricating oil metered to each cylinder of a large, low-speed, main propulsion
diesel engine is ______________.
(A) the
same, whether at sea, or during maneuvering
same, whether at sea, or during maneuvering
(B) adjusted
during each hour of operation while at
constant RPM
during each hour of operation while at
constant RPM
(C) higher
at sea than while maneuvering
at sea than while maneuvering
(D) lower
at sea than while maneuvering
at sea than while maneuvering
Briefly Justify Your Answer
9.
On a medium-speed main propulsion diesel engine, the
crankpin or crank journal bearings receive lubricating oil from _____________.
On a medium-speed main propulsion diesel engine, the
crankpin or crank journal bearings receive lubricating oil from _____________.
(A) a
spindle lubricator
spindle lubricator
(B) an
oil jet
oil jet
(C) internal
splashing
splashing
(D) drilled
passages in the crankshaft
passages in the crankshaft
Briefly Justify Your Answer
10. Fins
are installed on the generating tube surfaces in waste heat boilers to
____________.
are installed on the generating tube surfaces in waste heat boilers to
____________.
(A) prevent
soot fires in the exhaust system
soot fires in the exhaust system
(B) prevent
exhaust gas erosion of the tubes
exhaust gas erosion of the tubes
(C) increase
the velocity of exhaust gas flow
the velocity of exhaust gas flow
(D) increase
the rate of heat transfer
the rate of heat transfer
Briefly Justify Your Answer
1.
During your watch one of the main engine unit was
indicating high exhaust temperature reading. Write a note to Chief Engineer
explaining:
During your watch one of the main engine unit was
indicating high exhaust temperature reading. Write a note to Chief Engineer
explaining:
(a)
how the cause leading to abnormal running condition was
diagnosed
how the cause leading to abnormal running condition was
diagnosed
(b)
subsequent action taken to control the fire.
subsequent action taken to control the fire.
2. State
FOUR operational conditions that may lead to vibration of the main transmission
shafting.
FOUR operational conditions that may lead to vibration of the main transmission
shafting.
3. What
are the main advantages of the impulse and the constant pressure exhaust
turbo-charging systems?
are the main advantages of the impulse and the constant pressure exhaust
turbo-charging systems?
4. Explain
how sluggish action of the suction and delivery valves reduces the volumetric
efficiency of an air compressor.
how sluggish action of the suction and delivery valves reduces the volumetric
efficiency of an air compressor.
5. (a) Make a detailed sketch of a tilting pad type
thrust block.
thrust block.
(b) Give a
detailed description of the tilting pad block. stating any important dimensions
and clearances.
detailed description of the tilting pad block. stating any important dimensions
and clearances.
6. With
respect of hydraulic ram type steering gear:
respect of hydraulic ram type steering gear:
(a) State
the emergency locking device that can be used in order to speedily bring the
steering gear to rest:
the emergency locking device that can be used in order to speedily bring the
steering gear to rest:
(b) State,
with one reason the best angular position to lock the steering gear in.
with one reason the best angular position to lock the steering gear in.
7. The
reading of the steam pressure gauge of an auxiliary boiler is suspect.
Describe:
reading of the steam pressure gauge of an auxiliary boiler is suspect.
Describe:
(a) The
action to be taken
action to be taken
(b) How the gauge could be calibrated
8. (a)
Sketch a cascade control system.
Sketch a cascade control system.
(b) Explain the operation of this cascade
system.
system.
9. In
any diesel engine closed freshwater cooling system, the lowest pressure exists
at the _____________.
any diesel engine closed freshwater cooling system, the lowest pressure exists
at the _____________.
(a)
jacket water outlet
jacket water outlet
(b)
cooling water pump outlet
cooling water pump outlet
(c)
heat exchanger outlet
heat exchanger outlet
(d)
expansion tank atmospheric vent
expansion tank atmospheric vent
Briefly Justify
Your Answer
Your Answer
10. The
main advantage of unit injectors over other fuel injection
systems is _____________.
main advantage of unit injectors over other fuel injection
systems is _____________.
(a)
Reducing the need of too many high pressure fuel lines
Reducing the need of too many high pressure fuel lines
(b)
their relatively low injection pressures
their relatively low injection pressures
(c)
reduced wear of spray orifices
reduced wear of spray orifices
(d)
the lessened chance of fuel leaks into the engine sump
the lessened chance of fuel leaks into the engine sump
Briefly Justify your Answer
1.
Put
up a notice on the Lube Oil Purifier, to keep a close eye on the Lube Oil level
on the sight glass, which is not giving a clear indication of the level owing
to the glass being damaged. Suggest some precautions in the notice.
Put
up a notice on the Lube Oil Purifier, to keep a close eye on the Lube Oil level
on the sight glass, which is not giving a clear indication of the level owing
to the glass being damaged. Suggest some precautions in the notice.
2. A dirty atomizer sprayer plate in the burner of an auxiliary boiler,
would be indicated by ____________.
would be indicated by ____________.
(a)
carbon on the register doors
carbon on the register doors
(b)
a dazzling white atomizer flame
a dazzling white atomizer flame
(c)
fluctuating pressure in the windbox
fluctuating pressure in the windbox
(d)
an unevenly shaped burner flame
an unevenly shaped burner flame
Briefly justify
your answer
your answer
3.
Lubricating oil systems for diesel engine journal
bearings are usually lubricated by which of the following types of lubricating oil systems?
Lubricating oil systems for diesel engine journal
bearings are usually lubricated by which of the following types of lubricating oil systems?
(a)
Splash
Splash
(b)
Gravity
Gravity
(c)
Pressure
Pressure
(d)
Bypass
Bypass
Briefly justify your answer.
4. Recent
experience has shown persistent damage occurring on seating faces of main
engine exhaust valves which is not confined to any particular cylinder unit.
experience has shown persistent damage occurring on seating faces of main
engine exhaust valves which is not confined to any particular cylinder unit.
(a)
State, with reasons, the possible causes.
State, with reasons, the possible causes.
(b)
State the short-term action to be taken in order to
minimize engine operational problems.
State the short-term action to be taken in order to
minimize engine operational problems.
5. Make
a diagrammatic sketch of a jacket cooling water system as applied to a group of
medium speed auxiliary diesel engines. Indicate the temperatures and pressures
in the system. Describe in particular the flow of water from entry to the
engine to outlet from the engine and sketch the more important joints in the
system.
a diagrammatic sketch of a jacket cooling water system as applied to a group of
medium speed auxiliary diesel engines. Indicate the temperatures and pressures
in the system. Describe in particular the flow of water from entry to the
engine to outlet from the engine and sketch the more important joints in the
system.
6. With the aid of a
block diagram describe the operation of an electronic governor fitted to an
auxiliary diesel engine.
block diagram describe the operation of an electronic governor fitted to an
auxiliary diesel engine.
7.
Explain briefly how the different moving parts of a
main engine are subjected to various stresses.
Explain briefly how the different moving parts of a
main engine are subjected to various stresses.
Name the stresses and
justify by stating how they originate.
justify by stating how they originate.
8. With reference to pneumatically operated
control valves, used in piston cooling water systems
control valves, used in piston cooling water systems
(a)
State FOUR reasons for fitting a valve positioner;
State FOUR reasons for fitting a valve positioner;
(b)
Explain the operation of a positioner in control
engineering terms;
Explain the operation of a positioner in control
engineering terms;
9. Describe any Super -charging system other
than the pulse or constant pressure systems.
than the pulse or constant pressure systems.
10. The highest pressure in any closed diesel engine
freshwater cooling system is at the _____________.
freshwater cooling system is at the _____________.
(a)
jacket water outlet
jacket water outlet
(b)
expansion tank inlet
expansion tank inlet
(c)
heat exchanger inlet
heat exchanger inlet
(d)
cooling water pump outlet
cooling water pump outlet
Briefly Justify Your Answer.
1.
Give
instructions to the support crew for matters concerning safety during
watchkeeping related to rotating machinery parts.
Give
instructions to the support crew for matters concerning safety during
watchkeeping related to rotating machinery parts.
2.
Sketch and describe a main air starting valve
of any large two stroke marine diesel engine known to you.
Sketch and describe a main air starting valve
of any large two stroke marine diesel engine known to you.
3.
Write short notes on :
Write short notes on :
A.
Turning
Gear
Turning
Gear
B.
Means
of absorbing thrust of a 4 stroke auxiliary engine crankshaft
Means
of absorbing thrust of a 4 stroke auxiliary engine crankshaft
C.
Lubrication
of large 2 stroke marine diesel engine drive gear / timing gear.
Lubrication
of large 2 stroke marine diesel engine drive gear / timing gear.
4.
Cooling the intake air supplied to a diesel engine will
_____________.
Cooling the intake air supplied to a diesel engine will
_____________.
A.
reduce mean effective pressure
reduce mean effective pressure
B.
decrease average compression pressure
decrease average compression pressure
C.
decrease air charge density
decrease air charge density
D.
increase power output
increase power output
Briefly justify
your Answer.
your Answer.
5.
When there is a flame failure in an automatically fired
auxiliary boiler, the ____________.
When there is a flame failure in an automatically fired
auxiliary boiler, the ____________.
A.
air supply is shut off
air supply is shut off
B.
fuel supply is shut off
fuel supply is shut off
C.
water feed is shut off
water feed is shut off
D.
safety valve lifts
safety valve lifts
Briefly justify
your Answer.
your Answer.
6.
Lubrication for the main reduction gears used with
diesel engines is usually supplied by _____________.
Lubrication for the main reduction gears used with
diesel engines is usually supplied by _____________.
A.
oil from the main engine sump
oil from the main engine sump
B.
an independent lube oil system
an independent lube oil system
C.
the stern bearing head tank
the stern bearing head tank
D.
the stern bearing sump tank
the stern bearing sump tank
Briefly justify
your Answer.
your Answer.
7.
Which of the listed items should be secured before performing any maintenance on a solenoid operated
air start valve?
Which of the listed items should be secured before performing any maintenance on a solenoid operated
air start valve?
A.
Electric power
Electric power
B.
Lube oil standby pump
Lube oil standby pump
C.
Hydraulic switch
Hydraulic switch
D.
Motor drain
Motor drain
Briefly justify
your Answer.
your Answer.
8.
What is to be installed on an internal combustion
engine if its cylinder bore exceeds 200mm?
What is to be installed on an internal combustion
engine if its cylinder bore exceeds 200mm?
A.
Crankcase vapor monitors
Crankcase vapor monitors
B.
Engine exhaust silencers
Engine exhaust silencers
C.
Constant pressure type turbochargers
Constant pressure type turbochargers
D.
Explosion relief valves
Explosion relief valves
Briefly justify
your Answer.
your Answer.
9.
Which of the following actions should normally be taken
during each watch when the auxiliary boiler is in operation?
Which of the following actions should normally be taken
during each watch when the auxiliary boiler is in operation?
A.
Clean the flame scanner photocell window.
Clean the flame scanner photocell window.
B.
Inspect and clean all solenoid valves.
Inspect and clean all solenoid valves.
C.
Lift the safety valves by hand.
Lift the safety valves by hand.
D.
Inspect for oil or water leaks.
Inspect for oil or water leaks.
Briefly justify your Answer.
10. Excessive
vibration of an automatically fired auxiliary boiler can be caused by
_____________.
vibration of an automatically fired auxiliary boiler can be caused by
_____________.
A.
air or water in the furnace
air or water in the furnace
B.
combustion pulses
combustion pulses
C.
fuel oil pump failure
fuel oil pump failure
D.
flame failure
flame failure
Briefly justify
your Answer.
your Answer.
