MEO Class 4B Marine Engineering Knowledge Past Papers- Part 4

1. Write
a letter to the company Technical Manager stating with reasons why the fuel
bunkered in the last port is of very poor quality.

2. Write
Short notes on the following:

(a) Main
air starting valves

(b) Fuel
injectors

(c) Cam
shafts

3. Describe
any turbo-charging system based on the pulse or constant pressure systems.

4. (a) Explain why it is necessary to reduce the
rolling of a vessel.

(b) Describe with the aid of a sketch, ONE method
of reducing roll in a vessel.

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.

6. (a) Describe THREE different patterns of tube
used in exhaust gas boilers.

(b) Give
TWO reasons why a tube is condemned.

(c) Describe
how it is replaced by a spare tube.

(d)
Suggest with reasons the possible consequences of allowing an exhaust
gas boiler to run dry during full power
operation of the main engine

7. With
reference to air compressors state why:

(a) Clearance
volume should be as small as possible,

(b) Cylinder
lubrication should be minimal,

(c) Intake
filters should be cleaned regularly,

(d) Suction and
delivery spring loaded plate valves are use.

8. A
dirty atomizer sprayer plate in the burner of an auxiliary boiler, would be
indicated by ____________.

(a)
carbon on the register doors

(b)
a dazzling white atomizer flame

(c)
fluctuating pressure in the windbox

(d)
an unevenly shaped burner flame

Briefly Justify
Your Answer

9. The
highest pressure in any closed diesel engine freshwater cooling system is at the
_____________.

(a)
jacket water outlet

(b)
expansion tank inlet

(c)
heat exchanger inlet

(d)
cooling water pump outlet

Briefly Justify
Your Answer

10. Which of
the following statements describes the function of an alarm annunciator on an
engine room alarm panel?

(a)
An alarm condition causes a light and siren to come on
which remain on until the machinery is secured.

(b)
A flashing light comes on, followed by an audible
alarm. When an alarm acknowledge button is depressed, the audible alarm is
silenced and light stays on.

(c)
An alarm condition gives an audible and visual alarm
signal, both of which are secured when the alarm acknowledge button is
depressed.

(d)
An alarm condition causes a flashing light to come on,
followed by an audible alarm. When the alarm acknowledge button is depressed,
the warning light is extinguished.

Briefly Justify
Your Answer

1. Misalignment
of the main shafting between engine and propeller causes bearing overloads and
shaft stress.

2. (a) Sketch diagrammatically a device for
controlling the viscosity of the fuel oil to the injectors.

(b) State the value at which the viscosity should
be maintained.

3. How
are auxiliary engine-starting air valves connected and operated? What attention
do they require?

4. With
reference to heat exchangers state why:

(a) Titanium is often used in preference to other
materials;

(b) Sweating of tubes into tube-plates is
preferable to brazing;

(c) Rolling of tubes into tube-plates s
preferable to using ferrules and grommets.

5. With
reference to fuel cam design state:-

(a) Why
dwell is sometimes incorporated.

(b) The
purpose of reduce width on certain sections of the cam.

(c) What
governs the spring force?

6. Describe
a system of feed water treatment suitable for an auxiliary boiler and explain
the test on the boiler water, which are necessary to ensure that the condition
of the water is satisfactory.

7.
The diameters of crankshaft and intermediate shaft
bearings are different, and in old engines there may also be differences in the
crankshaft journals. How is the axial center-line of the various bearings found
when taking measurements to establish the true shafting line?

8.
Enumerate the properties desirable in a crankcase
lubricating oil suitable for use in a trunk piston engine and describe a system
for purifying the oil. State how and why the system is operated.

9.
Sketch
and describe a crankcase oil mist detector system and state the conditions,
which will actuate the alarm.

How is the system tested to ensure that it is in working order?

10.
Describe
how readings of cylinder liner wear are taken and indicate the form in which
the measurements are recorded for reference. Explain why limits are imposed on
the maximum wear of cylinder liners and state the possible effects on engine
operation if these limits are exceeded.

1.
Discuss the importance- of correct cylinder lubrication in a large
Diesel engine, explaining the possible consequences of both over- and
under-lubrication.

2.
Sketch and describe systems using loop and uniflow scavenging. What is
meant by scavenge efficiency ?

3.
What modification of the fuel injection and atomising arrangements may
be found necessary when oil having a high viscosity, such as boiler oil, is
used for fuel?

4.
Describe, with the aid of sketches, the construction of the cross head
guides and columns for a any large 2 stroke slow speed main propulsion engine.

5.
Sketch and describe automatic devices for the under mentioned duties:

(a) Controlling piston cooling water temperature,

(b) Indication of low oil
pressure.

(c) Indication of high oil
pressure.

6.
Discuss the causes, possible associated hazards and lowering of thermal
efficiency consequent on poor combustion in a Diesel engine cylinder.
Illustrate your answer by means of indicator cards.

7.
The amount of oil atomized by the return flow variable
capacity atomizer, used with some automatically fired boilers, is controlled by
the _______________.

(a)
amount of air admitted to the atomizer

(b)
oil pressure in the oil return line

(c)
quantity of oil delivered by the service pump

(d)
proportioning device in the atomizer fuel valve

Briefly Justify Your Answer

8.
A diesel engine should not be operated at low loads for
long periods of time because
_____________.

(a)
heavy carbon deposits will buildup on the valves and in
the exhaust

(b)
fuel dilution is increased at low load

(c)
exhaust valves may be damaged

(d)
all of the above

Briefly Justify Your Answer

9.
The major cause of fuel pump and injection system
problems is _____________.

(a)
improper adjustments

(b)
contaminated fuel

(c)
kinked fuel lines

(d)
excessive engine vibration

Briefly Justify Your Answer

10. A
dirty fuel oil filter element can be detected by ________.

(a)
visual inspection of the element

(b)
the pressure drop across the filter

(c)
high fuel oil tank temperature

(d)
increase flow rate from the filter

Briefly Justify Your Answer

1.
A main engine liner which was recently overhauled and
its sealing rings renewed, started leaking during the voyage. Write a letter to
the owners suggesting what you propose to do in the next port, to ensure that
such a problem does not reoccur again.

2. Sketch
the main engine lubricating oil system of a large 2 stroke marine diesel engine
and state the L.O. safety devices on the system.

3. State
with reason the essential requirement for unattended machinery spaces(UMS).

4. (a)
Describe briefly the operation of an electrical or hydraulic main engine
governor.

(b) For
the type described indicate how failure can occur and the action to be taken if
immediate correction cannot be achieved and the engine must be operated.

5. Generally
speaking the foundation of a reciprocating engine must perform three function

(a) Support
the weight of the engine.

(b) Maintain
the engine in proper alignment with the driven mechanism.

(c) Absorb
vibrations produced by unbalanced forces due to reciprocating and revolving
manners.

How is the foundation fabricated
to perform all these functions. Suggest any other function, you think it,
performs other than the ones stated above.

6. Explain
the concept of pH and the significance of its value in boiler water chemical
conditioning.

Suggest, with
reasons, what could cause the pH value in boiler water to reduce:

(i)
Rapidly over a short period of time

(ii)
Gradually over a long period of time.

7. State
what can be done to continue operation with a turbo-charger having water
leakage into the exhaust gas space.

8. Sketch
a simple cross-section through a single stage jacket cooling water centrifugal
pump with a fully shrouded single entry impeller; name the components of the
pump and indicate the direction of fluid
flow.

9. The
diesel driven life boat engine 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.

10. Excessive
leakage and premature failure of valve packing is a result of ____________.

(a)
opening a valve too quickly

(b)
jamming a valve in the closed position

(c)
low pressure fluid flow through the pipeline

(d)
a scored valve stem

Briefly Justify
Your Answer

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.

2.
Sketch an Main engine starting air system, used for
a large 2 stroke slow speed engine 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

(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.

Briefly Justify Your Answer.

4. The main
requirements which a fuel injection system must fulfil are ________________

(a) accurate metering
of small amount of fuel oil.

(b) control of
quality of fuel injection

(c) proper timing of
the fuel injection

(d) selective
distribution of the fuel in the combustion space.

Discuss each point subsequently state wether
it is appropriate or not.

5. In any marine
diesel engine, air movements inside a combustion chamber is very important.
Generally speaking, air movement helps

(a) to distribute the
fuel

(b) to mix it with
air

(c) to cool the
cylinder liner

(d) to help in
optimising liner lubrication

(e) to assist
combustion

(f) to reduce after
burning

(g) to reduce
combustion temperatures.

State which of the above points are true or 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

(a) the quality of
fuel

(b) the quality of
servicing of the governor in the last port.

(c) the supply of
charge air

(d) the overhaul of
fuel injectors done in the last decarbonisation

Discuss each point and give suggestion to
obviate the problem

7. Describe the
inspection undertaken with respect to your ships main propulsion engines during a one-day stoppage at a
foreign port after a long period of continuous running.

8. The diesel driven
emergency generator 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 one of the generators
engines 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.