MEO Class 4B E-Pariksha Questions and Answers of Marine Engineering Knowledge have been discussed here. Questions that are present here were asked in the previous year and hence they become important, in order to get insight of what is been asked in these exam:
Function: Marine Engineering at Operational Level
Marine engineering knowledge for Class 4B MMD exam
1. Sketch
and describe a pneumatic control system for controlling temperature of main
engine lubricating oil at outlet of the cooler and –
and describe a pneumatic control system for controlling temperature of main
engine lubricating oil at outlet of the cooler and –
(a) Explain
why air supplied to a pneumatic control system must be free from dust and water
;
why air supplied to a pneumatic control system must be free from dust and water
;
(b) Describe
how above impurities are removed ;
how above impurities are removed ;
2. (a)
Describe the events leading to a crankcase explosion.
Describe the events leading to a crankcase explosion.
(b)
State how overheating might be indicated other than by
a mist detector.
State how overheating might be indicated other than by
a mist detector.
(c)
State how severity of a crankcase explosion is limited.
State how severity of a crankcase explosion is limited.
3.
State FOUR operational conditions that may lead to
vibration of the main transmission shafting.
State FOUR operational conditions that may lead to
vibration of the main transmission shafting.
Suggest
methods to reduce the vibration levels that may occur in the main transmission
shafting.
methods to reduce the vibration levels that may occur in the main transmission
shafting.
4. How
is the mathematically straight line obtained from which the height of the axial
center-lines of the bearings are measured when establishing a true shaft line?
is the mathematically straight line obtained from which the height of the axial
center-lines of the bearings are measured when establishing a true shaft line?
5. (a) How do stabiliser fins operate.
(b)
How are stabiliser fins controlled.
How are stabiliser fins controlled.
6.
With
reference to fuel handling equipment:
With
reference to fuel handling equipment:
(a) Explain why a settling tank is considered
necessary;
necessary;
(b) Describe, with the aid of a sketch, the
operation of a purifier;
operation of a purifier;
7. Explain
how an oily water separator is put into operation and shut down after pumping
bilges.
how an oily water separator is put into operation and shut down after pumping
bilges.
8. When
a waste heat boiler is installed in the exhaust of a main propulsion diesel
engine, the exhaust gas bypass would be used ____________.
a waste heat boiler is installed in the exhaust of a main propulsion diesel
engine, the exhaust gas bypass would be used ____________.
(a)
at high loads to prevent overheating
at high loads to prevent overheating
(b)
at low loads to prevent corrosion in the boiler
at low loads to prevent corrosion in the boiler
(c)
during periods of high steam demand
during periods of high steam demand
(d)
when the turbocharger is in operation
when the turbocharger is in operation
Briefly Justify your Answer
9. It
is desirable for an auxiliary boiler safety valve to pop open and reseat
quickly to __________.
is desirable for an auxiliary boiler safety valve to pop open and reseat
quickly to __________.
(a) give warning that
excessive boiler pressure has been reached
excessive boiler pressure has been reached
(b) prevent wire
drawing of the disc and seat
drawing of the disc and seat
(c) prevent valve
pounding
pounding
(d)provide
sufficient blowdown
sufficient blowdown
Briefly Justify your Answer
10. Which of
the following statements is correct regarding grades of pipe?
the following statements is correct regarding grades of pipe?
(a) Stainless steel
pipe is manufactured in four general grades.
pipe is manufactured in four general grades.
(b) Brass pipe is
manufactured in three common grades.
manufactured in three common grades.
(c) Copper pipe is
manufactured in two common grades.
manufactured in two common grades.
(d)The
term “extra strong” is normally associated with schedule 160 steel
pipe.
term “extra strong” is normally associated with schedule 160 steel
pipe.
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.
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. The
muffling of exhaust gas noise in 4 stroke auxiliary engines in achieved by
muffling of exhaust gas noise in 4 stroke auxiliary engines in achieved by
(a) Allowing
the gas to expand.
the gas to expand.
(b) Change
the direction of their flow.
the direction of their flow.
(c) Cool
the gas with injected water.
the gas with injected water.
(d) Cool
the gas with scavenge air.
the gas with scavenge air.
State which of the above is true
and which is false. Give adequate reasons for justification.
and which is false. Give adequate reasons for justification.
3. Supercharging
an existing medium speed naturally aspirated engine will
an existing medium speed naturally aspirated engine will
(a) Reduce
weight of the engine.
weight of the engine.
(b) Reduce
bulk of the engine.
bulk of the engine.
(c) Increase
existing power.
existing power.
(d) Increase
piston speed.
piston speed.
(e) Reduce
fuel consumption.
fuel consumption.
Give an appropriate answer to the
statement made above, giving adequate justification.
statement made above, giving adequate justification.
4. (a)
Values of some main engine exhaust temperatures displayed in the engine control room differ from those displayed on the
engine for the same cylinders.
Values of some main engine exhaust temperatures displayed in the engine control room differ from those displayed on the
engine for the same cylinders.
(i) Explain
how it may be determined which readings are inaccurate.
how it may be determined which readings are inaccurate.
(ii)
State possible reasons for these inaccurate readings.
State possible reasons for these inaccurate readings.
(iii)
Explain how the location of the faults may be detected.
Explain how the location of the faults may be detected.
(b) State
the periodic checks, which should be undertaken to ensure that remote engine
instrumentation is reading accurately.
the periodic checks, which should be undertaken to ensure that remote engine
instrumentation is reading accurately.
5. Name
the various types of gears and state which types may be found in marine diesel
engine practice, either on engines or within propulsion reduction gearing.
the various types of gears and state which types may be found in marine diesel
engine practice, either on engines or within propulsion reduction gearing.
6. With
reference to main engine control systems, state what is meant by:
reference to main engine control systems, state what is meant by:
(a) Two step action;
(b) Proportional control;
(c) Offset;
Give examples
of each type, used in the control system.
of each type, used in the control system.
7. (a) Sketch a simple line diagram showing a
shipboard aerobic sewage treatment
system.
shipboard aerobic sewage treatment
system.
(b) Describe the system sketched in above and explain its operation.
8. Sketch
and describe an auxiliary boiler suitable for installation in a motor ship
showing clearly the arrangements for utilising exhaust gases and the burning of
oil fuel simultaneously.
and describe an auxiliary boiler suitable for installation in a motor ship
showing clearly the arrangements for utilising exhaust gases and the burning of
oil fuel simultaneously.
9. Define
the indications of a leaking cylinder starting air valve. Suggest with reasons
the possible consequences of permitting a leaking starting air valve to remain
in this condition for an extended period of time. Identify those factors
leading to such leakage. State how leakage can be largely avoided in practice.
the indications of a leaking cylinder starting air valve. Suggest with reasons
the possible consequences of permitting a leaking starting air valve to remain
in this condition for an extended period of time. Identify those factors
leading to such leakage. State how leakage can be largely avoided in practice.
10. Sketch in
detail a section through a hydraulic
governor as fitted to medium speed unidirectional engines. Explain how
it operates under frequent and wide load changes.
detail a section through a hydraulic
governor as fitted to medium speed unidirectional engines. Explain how
it operates under frequent and wide load changes.
1. S & D the operation of a governor suitable for diesel engine
for A.C. generator
for A.C. generator
2. Sketch and describe an independent two-stage air compressor. Draw a
set of typical indicator diagrams and insert the various pressures and
temperatures. Indicate the effect of a leaking H.P. suction valve and excessive
H.P. clearance volume.
set of typical indicator diagrams and insert the various pressures and
temperatures. Indicate the effect of a leaking H.P. suction valve and excessive
H.P. clearance volume.
3. Discuss the various factors affecting the failures of crankshafts
in marine diesel engines.
in marine diesel engines.
4.
Detail the procedure
of calibrating a cylinder liner of an auxiliary diesel engine. How the results should be presented for
future reference.
Detail the procedure
of calibrating a cylinder liner of an auxiliary diesel engine. How the results should be presented for
future reference.
5.
The exhaust manifold
of an auxiliary engine under load turns red hot. There is no lagging on the manifold. What efforts would you make to cool down the
manifold? State the efforts made without
stopping the engine.
The exhaust manifold
of an auxiliary engine under load turns red hot. There is no lagging on the manifold. What efforts would you make to cool down the
manifold? State the efforts made without
stopping the engine.
6.
During every night
watch, the bridge watch keepers complain of continuous sparks from the
funnel. You are convinced that the
sparks have something to do with the fuel or the combustion system. What simple corrective steps would you
initiate to reduce the degree of sparking.
During every night
watch, the bridge watch keepers complain of continuous sparks from the
funnel. You are convinced that the
sparks have something to do with the fuel or the combustion system. What simple corrective steps would you
initiate to reduce the degree of sparking.
7.
The main requirements
which a fuel injection system must fulfil are
The main requirements
which a fuel injection system must fulfil are
(a)
accurate metering of
small amount of fuel oil
accurate metering of
small amount of fuel oil
(b)
control of quality of
fuel injection
control of quality of
fuel injection
(c)
proper timing of the
fuel injection
proper timing of the
fuel injection
(d)
selective distribution
of the fuel in the combustion space
selective 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.
each one of the points made above are true or false. If any point you perceive is false, state why
is it so.
8.
An auxiliary engine
under load continuously fluctuates even with a steady load. The fault you diagnose could be owing to
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
the quality of fuel
(b)
the quality of
servicing of the governor in the last port
the quality of
servicing of the governor in the last port
(c)
the supply of charge
air
the supply of charge
air
(d)
the overhaul of fuel
injectors done in the last decarbonisation
the overhaul of fuel
injectors done in the last decarbonisation
Give a brief explanation as to why each of the above
mentioned points either could be true or cannot at all be the reasons for such
a fluctuation.
mentioned points either could be true or cannot at all be the reasons for such
a fluctuation.
9.
With reference to a 2
stroke slow speed main propulsion engine air starting system
With reference to a 2
stroke slow speed main propulsion engine air starting system
(a)
State, with reasons,
Three safety features incorporated in an air starting system.
State, with reasons,
Three safety features incorporated in an air starting system.
(b)
State with reason why
an engine may fail to turnover on air.
State with reason why
an engine may fail to turnover on air.
10. 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 check you would make to
confirm the cause of this problem.
refuses to start after running perfectly for a period of half an hour just
before you prepare it to restart again . State just 4 check you would make to
confirm the cause of this problem.
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.
Sketch
and describe a crankcase relief valve fitted on to large 2 stroke marine diesel
engine crankcase doors.
Sketch
and describe a crankcase relief valve fitted on to large 2 stroke marine diesel
engine crankcase doors.
3.
The crankcase of many diesel engines are kept under a
slight vacuum by the ______________.
The crankcase of many diesel engines are kept under a
slight vacuum by the ______________.
(A) scavenging
action of the piston
action of the piston
(B) piston
type vacuum pump taking suction off a differential manometer
type vacuum pump taking suction off a differential manometer
(C) gland
exhausting manometer
exhausting manometer
(D) crankcase
exhaust fan
exhaust fan
Briefly
Justify Your Answer.
Justify Your Answer.
4.
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
(B) Gravity
(C) Pressure
(D) Bypass
Briefly
Justify Your Answer.
Justify Your Answer.
5.
Which of the following conditions can cause above
normal air temperature to develop in the intake manifold of a four-stroke/cycle,
turbocharged, diesel engine?
Which of the following conditions can cause above
normal air temperature to develop in the intake manifold of a four-stroke/cycle,
turbocharged, diesel engine?
(A) Clogged
air intake filters
air intake filters
(B) Piston
blow-by
blow-by
(C) A
defective aftercooler
defective aftercooler
(D) Faulty
exhaust valves
exhaust valves
Briefly
Justify Your Answer.
Justify Your Answer.
6.
When may the crankcase ventilation pipes or oil drain
pipes of two or more engines be connected?
When may the crankcase ventilation pipes or oil drain
pipes of two or more engines be connected?
(A) Propulsion
engines under 1000 shaft horsepower may share a common crankcase vent provided
the oil drains remain separate.
engines under 1000 shaft horsepower may share a common crankcase vent provided
the oil drains remain separate.
(B) In
most cases it is desirable and cost effective for propulsion engines to share a common crankcase
ventilation and monitoring system.
most cases it is desirable and cost effective for propulsion engines to share a common crankcase
ventilation and monitoring system.
(C) No
interconnection may be made between the crankcase ventilation pipes or oil
drain pipes.
interconnection may be made between the crankcase ventilation pipes or oil
drain pipes.
(D) None
of the above are correct.
of the above are correct.
Briefly
Justify Your Answer.
Justify Your Answer.
7.
Which of the following statements describes the
unchecked growth of microbiological organisms within a fuel system?
Which of the following statements describes the
unchecked growth of microbiological organisms within a fuel system?
(A) The
dying bacteria will cause a coating to be formed on the sides of the tank
thereby decreasing corrosion.
dying bacteria will cause a coating to be formed on the sides of the tank
thereby decreasing corrosion.
(B) The
fuel in the tank will loose its fluidity, solidify, and be the
cause of an expensive removal process.
fuel in the tank will loose its fluidity, solidify, and be the
cause of an expensive removal process.
(C) Corrosion
of various metal components will occur due to the formation of hydrogen sulfide
gas.
of various metal components will occur due to the formation of hydrogen sulfide
gas.
(D) All
of the above are correct.
of the above are correct.
Briefly
Justify Your Answer.
Justify Your Answer.
8.
If the feed pump for an auxiliary boiler fails to
deliver the feed water to the boiler, the cause may be ____________.
If the feed pump for an auxiliary boiler fails to
deliver the feed water to the boiler, the cause may be ____________.
(A) high
steam pressure in the boiler
steam pressure in the boiler
(B) abnormally
high feedwater temperature
high feedwater temperature
(C) abnormally
high boiler water temperature
high boiler water temperature
(D) steam
demand exceeding feed pump capacity
demand exceeding feed pump capacity
Briefly
Justify Your Answer.
Justify Your Answer.
9.
When lighting off an auxiliary boiler, which of the problems listed
could cause the burners to sputter?
When lighting off an auxiliary boiler, which of the problems listed
could cause the burners to sputter?
(A) Cold
fuel oil
fuel oil
(B) Low
fuel oil pressure
fuel oil pressure
(C) Low
atomizing steam pressure
atomizing steam pressure
(D) Water
in the fuel oil
in the fuel oil
Briefly
Justify Your Answer.
Justify Your Answer.
10. Write
short notes on the Following:
short notes on the Following:
(A) Fuel
Oil Additives
Oil Additives
(B) Aux
Engine over speed trip
Engine over speed trip
1. (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.
pad block. stating any important dimensions and clearances.
2. Sketch
and describe an auxiliary air compressor, showing the safety device fitted.
and describe an auxiliary air compressor, showing the safety device fitted.
3. State
with reasons, the effect that the following course of action would have on
charge air pressure:-
with reasons, the effect that the following course of action would have on
charge air pressure:-
(a) Increase
fuel to the engine.
fuel to the engine.
(b) Open
exhaust gas boiler by pass.
exhaust gas boiler by pass.
(c) Clean
air filter.
air filter.
4. Which
of the following actions takes place in the control circuit of an automatically
fired auxiliary boiler when the desired steam pressure is obtained?
of the following actions takes place in the control circuit of an automatically
fired auxiliary boiler when the desired steam pressure is obtained?
(a)
A temperature sensing device opens the circuit breaker
in the burner motor.
A temperature sensing device opens the circuit breaker
in the burner motor.
(b)
The high limit control secures power to the entire oil
firing system.
The high limit control secures power to the entire oil
firing system.
(c)
The stack relay actuates the low limit control which
breaks the ignition circuit.
The stack relay actuates the low limit control which
breaks the ignition circuit.
(d)
The stack relay secures power to the high voltage side
of the ignition transformer.
The stack relay secures power to the high voltage side
of the ignition transformer.
Briefly
Justify Your Answer
Justify Your Answer
5. With
reference to the turbocharger for a medium speed engine:
reference to the turbocharger for a medium speed engine:
(a) Explain
why ball or roller bearings are renewed periodically;
why ball or roller bearings are renewed periodically;
(b) State
the important considerations when removing and replacing turbocharger bearings;
the important considerations when removing and replacing turbocharger bearings;
6. With
reference to cylinder liner wear in large slow speed engine.
reference to cylinder liner wear in large slow speed engine.
(a) State
THREE major factors associated with wear.
THREE major factors associated with wear.
(b) (i) Explain the procedure for correct ‘running
in’ of piston rings and cylinder liners.
in’ of piston rings and cylinder liners.
(ii) Explain what is achieved by
‘running in’ process.
‘running in’ process.
(c) Describe
how cylinder lubrication limits wear.
how cylinder lubrication limits wear.
7. Give
a simple line sketch of a main engine jacket water cooling system.
a simple line sketch of a main engine jacket water cooling system.
8. With
regard to fuel injection systems explain the meaning of the following terms and
the means employed to reduce or eliminate their occurrence.
regard to fuel injection systems explain the meaning of the following terms and
the means employed to reduce or eliminate their occurrence.
(a) Secondary
Injection.
Injection.
(b) Carbon
Trumpets.
Trumpets.
(c) Diesel
Knock.
Knock.
9. Explain why in large, slow engines, power
balance between cylinders is desirable.
balance between cylinders is desirable.
10. Telescopic
pipes to the piston of a large slow-speed main propulsion diesel engine are
designed to prevent __________.
pipes to the piston of a large slow-speed main propulsion diesel engine are
designed to prevent __________.
(a) excessive
crankcase pressure
crankcase pressure
(b) excessive
lube oil temperature
lube oil temperature
(c) contamination
of the lube oil by water
of the lube oil by water
(d) contamination
of the cooling water by lube oil
of the cooling water by lube oil
Briefly Justify your Answer
