1) If the Jacket Cooling Water expansion tank level drops rapidly whilst Full Ahead on passage, what could cause this? There is a leakage in the lube oil cooler. There is an internal leakage on the engine. Cracked cylinder head. Malfunctioning thermostatic valve. 2) When all preparations have been made to ensure that the main engine is operational prior to departure, what will be the final test to be carried out ? Put out the turning gear and turn the lubricators. Blow indicator cocks, test reversing of engine, short firing kick. Close safety valves, blow indicator cocks, fill air bottles. Open air to engine, drain air bottles, blow indicator cocks. 3) To avoid the possibility of a scavenge fire what important check is to be carried out every watch and more frequently if a damaged piston ring is suspected? The cylinder lubrication. The exhaust gas temperature. The scavenge drain flow through.
Transcript
1) If the Jacket Cooling Water expansion tank level drops rapidly whilst Full Ahead on passage,
what could cause this?
There is a leakage in the lube oil cooler.
There is an internal leakage on the engine.
Cracked cylinder head.
Malfunctioning thermostatic valve.
2) When all preparations have been made to ensure that the main engine is operational prior to
departure, what will be the final test to be carried out ?
Put out the turning gear and turn the lubricators.
Blow indicator cocks, test reversing of engine, short firing kick.
Close safety valves, blow indicator cocks, fill air bottles.
Open air to engine, drain air bottles, blow indicator cocks.
3) To avoid the possibility of a scavenge fire what important check is to be carried out every
watch and more frequently if a damaged piston ring is suspected?
The cylinder lubrication.
The exhaust gas temperature.
The scavenge drain flow through.
Overhear the cylinder for noise.
4) Why blow the engine over on starting air before a start?
To be sure that water has not collected in the fire cylinders.
To be sure that no parts are loose, or that the engine is blocked from
rotation.
To get fresh air into cylinders ensuring a safe start of the engine.
To be sure that all indicator cocks are closed and there is no passage
into the combustion chamber.
5) An auxiliary diesel Engine cylinder head valve guide is shown. Which are the correct guide
dimensions for the nominal sizes shown?
0.0003125
12.00 : 27.04 11.96 : 26.96
11.92 : 27.05 11.81 : 27.04
11.65 : 27.21 11.60 : 27.23
6) On a large, slow speed diesel engine what would best describe the bottom end bearings?
Direct lined.
Wrapped bushes.
Solid insert liner.
Thick walled.
7) How is expansion allowed for in large diesel engine exhausts?
By sliding securing mounts.
By sliding section of piping.
By the selection of materials and construction to minimize expansion.
By the fitting of steel bellows pieces.
8) What part shown in this diagram ?
A crosshead bearing.
A piston and rings.
A piston filter.
A connecting rod.
9) What is the usual inlet temperature of Main Engine lubricating oil to the purifier (Tin) ?
70 degree C
75 degree C
85 degree C
95 degree C
10) What grade of fuel does the temperature of the daily tank suggest is in use ?
Intermediate or heavy fuel oil (1500 - 3500 sec redwood 1).
Marine diesel.
Distillate diesel.
Gas oil.
11) What are items 'F' ?
Flow controllers.
Thermostatic valves.
Filters.
Flow meters.
12) What is the function of the lubrication oil sump tank ?
To collect the system oil in use.
To act as as buffer tank of the system oil in use.
As supply source of the system oil.
All of these.
13) What kind of fuel oil system is shown here ?
A heavy fuel oil system.
A blend fuel oil system.
A marine diesel oil system.
A gas oil system.
14) What is the component marked 'BUC' ?
The Basic Unit Controller
The Blend Unit Controller
The Blend Unit Calorifier
The Base Unit Calorifier
15) Over which components does the Blending Unit Controller act in order to blend fuel of the
required viscosity?
The diesel oil and heavy fuel oil booster pumps.
The diesel oil and fuel oil inlet valves of the blender.
The steam inlet and return by-pass valves of the fuel heater.
All of these.
16) Where does the blending of fuels take place in this system ?
In units DP and FP
In unit H
In unit BU
In unit BUC
17) What are the components marked 'M' ?
Manometers
Magnetic shut-off valves
Microprocessors
Flow meters
18) What are the components marked 'F' ?
Flow meters.
Fuel filters.
Fuel pumps.
Fuel heaters.
19) Which part of this system is usually heated to 65 degree C ? Study the picture.
The blending unit BU.
The blending unit controller BUC.
The unit H.
The HFO daily tank.
20) What is the purpose of the Main Engine Dirty Oil tank ?
To act as collecting tank from Main Engine scavenge drains
To act as collecting tank for dirty oil from the Main Engine intended
for purification
To act as a collecting tank for all non-reusable oils
To act as a drain tank of the piston rod stuffing boxes
21) As a rule of thumb, the time interval for automatic desludging of lubricating oil purifiers
fitted on sumps of trunk-type engines should be set at ..................hours.
1 to 2
2 to 4
4 to 6
6 to 8
22) The ash content of a fuel oil is significant because it ....
indicates the quantity of energy released by burning a unit amount of
the fuel.
is useful for determining proper atomization temperatures.
reflects the overall thermal efficiency of the fuel oil.
is non-combustible and remains partly in the engine.
23) What is item 'V' ?
A flow control valve.
A viscometer.
A fine filter.
A steam trap.
24) What is item 'M' ?
The fuel flow meter.
The by-pass valve.
The magnetic filter.
The manometer.
25) What is the function of valve 'PR' in this fuel circuit ?
A safety blow-off valve in case of Emergency Stop.
A fuel drain valve in case of engine shut-down.
A de-gassing/ HP gas release by very high fuel temperature.
A constant pressure regulating valve.
26) What are the parts marked 'F' ?
Fine filters.
Magnetic filters.
Automatic filters.
Any of the these.
27) Fuel of 180 cst is in use on board. Fuel of 380 cst is now being bunkered. How will this
affect the reading of thermometer 'T' ?
Temperature will increase when 380 cst fuel is used.
Temperature remains constant, same fuel pump viscosity.
Temperature will decrease when 380 cst fuel is used.
None of the other options.
28) What description best fits the Main Engine Lub. Oil sump tank ?
A collecting and buffer tank of the Main Engine system oil
A Main Engine system oil reserve tank
A collecting tank for main engine dirty oil used by the Main Engine
An overflow tank of the Main Engine system oil
29) What do all the lubrication oil tanks that are connected the lubrication oil purifiers have in
common ?
They all contain extremely dirty oils.
They all contain the same grade of oil.
They all contain in-service oils.
They all contain waste oils.
30) Suppose Lubrication Oil Purifier No 2 is running M.E.L.O. sump tank to M.E.L.O. sump
tank. Lubrication Oil Purifier No 1 is now to be set up for the other tank purification, which set
up is not possible ?
Aux Diesel Renovating Tank to Renovating tank
M.E. Dirty Oil Tank to Dirty Oil tank
M.E. Dirty Oil tank to Lub. Oil sump tank
M.E. Lub Oil sump tank to Dirty Oil Tank
31) Where and how would you take sample of the oil from the Main Engine sump tank?
At the sample cock on delivery side of the M.E. Lub Oil Pump.
From the suction filter drain of the M.E. Lub Oil Pumps.
After the purifier when running sump to sump and M.E. running.
In port when engine is stopped taken directly from the sump tank.
32) How frequently are the tanks (item number 3) of this fuel oil schematic diagram refilled ?
They are constantly refilled by the fuel purifier.
They are refilled once per day.
They are refilled only when required.
They are refilled twice a week.
33) What would be the temperature of the oil in the settling tank (item number 3) shown in this
fuel oil arrangement?
45 to 60 degree C
30 to 45 degree C
60 to 80 degree C
Above 80 degree C
34) What is item number 4 of this fuel oil arrangement drawing ?
A fuel strainer.
A fuel transfer pump.
A heater.
A booster pump.
35) What is item number 5 of this fuel arrangement schematic drawing ?
A fuel oil transfer pump
A fuel oil booster pump
A fuel oil ball filter
A fuel oil purifier
36) At sea, what should be the level in tank number 2 of this fuel arrangement schematic
drawing ?
Variable, depending time of the day
Between 2/3 and 3/4 full
Full
Between 1/2 and 3/4 full
37) Which of the following system set-ups are possible using the fuel arrangement shown here ?
Settling to Daily, Daily to Daily tank
Daily to Settling, Settling to Settling tank
Settling to settling, Daily to Daily tank
Settling to Daily, Settling to Settling tank
38) What is the usual temperature of a fuel oil (HFO) daily tank?
40 to 50 degree C
50 to 60 degree C
60 to 75 degree C
80 to 90 degree C
39) Which of the following are not necessarily fitted on a HFO settling tank?
A drain valve (Spring loaded)
Quick closing shut-off valves (remote operated)
A thermometer
A remote tank gauging system
40) Which of the following alarms on UMS operation are not necessarily provided on the Fuel
Oil Daily Tank (HFO) ?
Daily tank low temperature
Daily tank low level
Daily tank high Level
Daily tank high temperature
41) What is the effect of temperature on the specific gravity of a fuel oil?
The higher the temperature the higher the specific gravity.
The lower the temperature the higher the specific gravity.
The higher the temperature the lower the specific gravity.
The lower the temperature the lower the specific gravity.
42) When in UMS mode of engine room operation, at what intervals should the HFO daily tank
be drained via valve 'D'?
At 08.00hr and 17.00hr as well in last evening round prior UMS
operation.
Every 4 hours.
Twice a day.
Once a day.
43) What is pipe No 1 ?
The cooling water outlet
The cooling water inlet
The lub oil inlet
The lub oil outlet
44) What is component No 5 ?
The lub oil inlet
The oil purging valve
The fresh water purger
The Sediment drain
45) What is part No 4 ?
The cooling water space.
The sacrificial anode.
The tubeplate.
The tubestack.
46) What is Part No 7 ?
The sediment tapping valve.
The cooling water drain valve.
The high pressure Lub oil inlet.
The water temperature gauge.
47) What is component number 3 ?
The cooling water inlet.
The lubricating oil outlet.
The cooling water outlet.
The air vent valve.
48) What is the purpose of the auxiliary diesel renovating lubrication oil tank ?
To collect used auxiliary diesel lubrication oil and purify it for reuse
To act as a purification stand-by tank for the auxiliary diesel sump tanks
To store auxiliary diesel fresh lube oil.
To act as a collecting tank for non-reusable auxiliary diesel lube oils
49) In a 4 cycle engine the inlet valve begins to open when the piston is ....
at BDC on the firing stroke.
after TDC on the suction stroke.
just before BDC on the suction stroke.
just before TDC on the exhaust stroke.
50) In a 4 cycle engine the exhaust valve opens when the piston is .....
at BDC on the suction stroke
just before TDC on the exhaust stroke
jusbefore BDC on the power stroke.
at BDC on the compression stroke
51) In a naturally aspirated 4 cycle diesel engine the exhaust valve is open for a period of
..................
180 degrees.
200 degrees.
250 degrees.
160 degrees.
52) What are the indications of excessive cylinder clearance in a small diesel engine? I Loss of
power. II Misfiring. III White exhaust smoke. IV Excessive consumption of lube oil.
II, III and IV
I, III and IV
I, II and III
I, II and IV
53) In a four stroke cycle diesel engine, the four stroke of the piston required to complete one
cycle which must take place in regular order. The second stroke ................ .
expels the burned gases.
draws air into the cylinder.
compresses the air.
is the power stroke.
54) If the output of this auxiliary diesel increases, say by 30 %, how will the thermometer
readings on the outlet side of engine and turbocharger change ?
They will slightly decrease (by 10 to 30 degrees C)
They will remain the same
They will slightly increase (by 20 to 50 degrees C)
They will greatly increase (by 80 to 100 degrees C)
55) How is the exhaust gas turbocharger cooled in relation to the engine ?
In series with the cylinders.
In line with the cylinders.
In parallel with the cylinders.
In tandem with the cylinders.
56) On a small diesel engine how would pump 'P' be driven ?
By 'V' belt from the crankshaft.
By an electric motor.
By gears driven from the crankshaft.
By gear drive from the main output shaft.
57) What is the component marked 'P' ?
The fresh water pump.
The lub oil pump.
The piston cooling pump.
The sea water pump.
58) What type of diesel engine is shown here ?
A four stroke supercharged engine.
A four stroke trunk type engine.
A two stroke crosshead type engine.
A two stroke trunk-piston type engine.
59) What type of scavenge system is in use in this diesel engine ?
A uniflow scavenge system.
Loop scavenging.
Diverted scavenging.
Combined scavenging.
60) What type of turbocharger would be fitted to this engine ?
An impulse type.
A constant pressure type.
A dual entry type.
A radial inlet type.
61) What type of diesel engine is shown here ?
A four stroke trunk type engine.
A four stroke flanged type engine.
A two stroke trunk type engine.
A two stroke suspended engine.
62) How are the inlet, exhaust valves and rocker arms actuated on this engine?
Directly lifted by the cams acting on pushrods.
Hydraulically lifted by cam activated servo unit.
Pneumatically lifted via cam activated air booster.
Indirectly lifted by cam via tumbler lever.
63) In this diagram if left is portside and right is starboard and during the taking of crankshaft
positions the rotation is counterclockwise, in what position is the engine crankshaft now shown ?
Between TP and P
Between P and S
Between S and TS
Between TS and TP
64) Which grade of fuel oil can be used in this kind of engine (built after 1990) ?
Marine diesel or distillate diesel oil.
Blend or intermediate fuel oil.
Heavy fuel oil.
Any of these fuels.
65) In a trunk type piston, the gudgeon pin is subject to two forces. What are these forces ?
Exhaust pressure and combustionl force.
Linear and and rotating motion.
Vertical force and horizontal force in line with crankshaft rotation .
Combustion pressure and crankshaft torque.
66) The fundamental difference between a 2-stroke and a 4-stroke engine is in the number of:
piston strokes each one needs to complete a revolution.
piston strokes each one needs to complete a combustion cycle.
strokes in each combustion cycle.
combustion events occurring in each stroke.
67) The third stroke of four-stroke diesel engine is called the ...........
compression stroke.
power stroke.
air stroke.
expansion stroke.
68) A diesel engine block is made of ............... and does not permit welding.
stainless steel.
mild steel.
cast iron.
tempered steel.
69) Which part of the mechanical governor is manipulated by the servo-motor to increase or
decrease engine speed ?
The linkage to the fuel rack.
The sensitivity band.
The compensating spring.
The dashpot.
70) What do you call the gauge that measures the concentric position of the crankshaft or rotor
shaft in its bearing ?
A bridge gauge.
A slip gauge.
A shafting gauge.
A poker gauge.
71) The narrow band of speed variation through which the governor makes no correction and
refers to the sensitivity of the governor is known as the ..............
speed droop.
sensitive band.
dead band.
isochronous band.
72) Which part is the valve guide?
Number 1
Number 2
Number 3
Number 4
73) Which part is the exhaust gas receiver ?
Number 1
Number 6
Number 7
Number 8
74) Which part is the exhaust valve ?
Number 1
Number 2
Number 4
Number 6
75) What is part number 3 ?
The air chamber
The combustion center
The combustion chamber
The piston glider
76) What is part number 5 ?
The air receiver
The scavenging air box
The air filter
The air cooler
77) What is part number 8?
The air box
The air filter
The cooler inlet
The air cooler
78) Which part is the turbine wheel ?
Number 4
Number 7
Number 8
Number 9
79) Which part is the auxiliary fan ?
Number 6
Number 7
Number 9
Number 10
80) What is part number 11?
The turbine wheel
The blower
The turbine outlet
The blower ring
81) The turbo charger turbine wheel is rotated by........
pressured air supplied by blower number 10.
inlet air coming from the inlet filter.
exhaust gas from the exhaust manifold.
any of the other options.
82) What liquid is used to clean the turbo charger of a large low speed main engine? (high speed
air side, half speed gas side)
Oil.
Water.
A chemical mixture of oil and water.
A chemical mixture of acid and water.
83) The force tending to twist the material such as the force on a shaft is called............
tensile stress.
compressive stress.
bending stress.
torsional stress.
84) What is the purpose of counterbore in a cylinder?
To facilitate piston overhaul
To have good an effective combustion
To prevent the piston ring from wearing a shoulder in the cylinder
To distribute the oil film evenly over the cylinder surface
85) Clearing a cylinder of exhaust gases by forcing in a current of air which provides clean air
for the next compression stroke is called .....
expansion.
compression.
scavenging.
cycle.
86) The last stroke of two-stroke diesel engine is called the .....
power stroke.
air stroke.
ignition stroke.
compression stroke.
87) If the cooling water temperature goes below it's recommended value, what can happen ?
Condensation of sulphuric acid on the cylinder walls
Condensation of lubricating oil on the cylinder walls
The engine cannot be started again
The fuel pumps may be clogged
88) If the cooling water temperature exceeds its recommended value, what can happen ?
Too much lubricating oil film will form on the cylinder walls which will
create black exhaust smoke
The blower will slow down
A less effective lubricating oil film is formed on the cylinder walls
The expansion tank will be emptied
89) What is item 'J' ?
A Water Strainer.
The Jacket Cooling Water Pump.
The Piston Cooling Water Pump.
The Sea Water Cooling Pump.
90) What kind of Jacket Cooling water system is shown here ?
An open circuit
A free closed circuit
A forced circuit
None of the other options
91) What absorbs the impact of the up-and-down movement of the piston telescopic pipes in this
water flow system ?
The expansion tank.
The construction of the buffer tank.
The air cushion in the buffer tank.
The up and downward movement of the indicating flaps.
92) If the system pressure is 3.5 kg/cm2, what will be the pressure in the buffer vessels ?
Exactly the same, 3.5kg/cm2
Higher than 3.5 kg/cm2.
Lower than 3.5 kg/cm2.
Fluctuating around 3.5 kg/cm2
93) Why is there an indicating flap 'IF' (shown with arrow up and arrow down) fitted on the
outlet of the piston cooling water buffer tank ?
To indicate if the pump is running
To indicate that the engine is running
To indicate that the buffer air in the system is in order.
To indicate that buffer air and water flow are in order.
94) What will happen to the level of the expansion tank if the engine slows down or stops ?
The level will decrease.
The level will increase.
The level will at first decrease but increases again.
Nothing will happen.
95) How are the crosshead bearings on this Diesel engine supplied with lubricating oil?
Direct from the lub oil main line.
From the camshaft lub oil line.
Via the main bearing, crankshaft, bottom end bearing and connecting rod.
Independently.
96) How is the gear train lubricated on this Diesel engine?
Via the crankshaft.
Via the camshaft system.
By its own independent lub oil cicuit.
Direct from the common lub oil circuit.
97) How is the thrust bearing lubricated on this Diesel engine?
Via the crankshaft.
Via the camshaft.
Direct via the main lub oil line.
By its own independent supply system.
98) Which of the following components is NOT directly lubricated by the lubricating inlet
supply line?
The crosshead bearing.
The main bearings.
The thrust bearing.
The gear train.
99) What is the function of the valve PR close to the lubrication oil pump ?
To keep the oil temperature constant.
To absorb pump vibrations.
To keep the oil pressure constant.
To act as a high pressure safety valve.
100) What type of scavenge air system is applied to this diesel engine ?
Loop scavenging
Uniflow scavenging
Compounded scavenging
None of the other options
101) When does the exhaust valve 'EV' open ?
When the piston is at bottom dead point.
When the piston moves upward.
At the end of the working stroke.
None of the other options
102) Which type of exhaust manifold feeds this turbocharger ?
Constant pressure type.
Booster type.
Impulse type.
Split type.
103) What is the function of drain valve 'D' ?
To release the air when the engine is stopped.
To drain the oil from the manifold.
To drain hydrocarbons and avoid explosion.
To drain the moisture from the manifold.
104) Which thermometer always indicates the highest temperature in the turbocharger ?
TEB
TE
TE1
TE5
105) What do you think would be a reasonable scavenge air pressure for this engine running at
full speed ?
25 kg/cm2
7.0 kg/cm2
1.25 kg/cm2
0.25 kg/cm2
106) What might be a reasonable value for the scavenge air temperature of this diesel running at
full speed ?
420 degrees C
75 degrees C
45 degrees C
28 degrees C
107) Under normal running conditions, what pressure is the exhaust gas entering the exhaust gas
turbocharger 'ET' ?
Under a vacuum.
Under high pressure.
Under slight overpressure.
Under atmospheric pressure.
108) In what part shown on this scavenge air schematic diagram is heat converted into
mechanical power ?
In part 2, the turboblower.
In the main engine.
In part 1, the exhaust gas turbine.
In part 5, the scavenge air blower.
109) In which part indicated on this scavenge air schematic is mechanical power converted to
thermal power ?
In the main engine
In the turboblower and scavenge air blower (no 2 and no 5)
In the exhaust gas turbine (no 1)
In the exhaust gas boiler
110) In an 'impulse type' exhaust gas turbocharger, the exhaust gases of the main engine ....
are entering into a spacious exhaust gas manifold.
are driving only one single turbocharger.
are led in pipe groups directly and separately to the turbocharger.
are led to two or three sections of the exhaust gas manifold.
111) On which unit of the scavenge air system is an automatic drain fitted ?
On the exhaust gas boiler.
On the turbo blower.
On the scavenge air blower.
On the scavenge air manifold.
112) Why can the temperature of the scavenge air after the scavenge air cooler not be lowered
below a given temperature and why has the temperature to be regulated above this value ?
To avoid cracking of the cylinder liner.
To maintain the thermal efficiency of the diesel.
To avoid misfiring and starting problems.
To avoid condensate and water entering the engine.
113) In a constant pressure type turbocharger the exhaust gas enters the turbo charger via ....
the grids of the common exhaust gas manifold.
the grids of two or more exhaust piping groups.
a separate manifold for each turbocharger.
nozzles on each individual exhaust pipe.
114) For a turbo charger is running at full speed, what would be a usual oil sump temperature on
the turbine side ?
35 to 45 degrees C
45 to 50 degrees C
55 to 65 degrees C
72 to 82 degrees C
115) When you read a crankshaft deflection figure and the + sign is indicated, for example +4,
this means that ....
the crankpin location is 4/100 mm out of centre.
the crankwebs have opened up by 4/100 mm.
the crankwebs have closed in by 4/100 mm.
the main bearing on one side is 4/100 mm greater than the other.
116) What are the two most important factors influencing the crankshaft deflection readings?
Condition of ballast tanks and temperature of engine.
Bearing wear and bedplate alignment.
Bedplate alignment and condition of after peak.
Ballast tank condition and bedplate alignment.
117) What is the purpose of a safety valve fitted in the cylinder cover of a diesel engine ?
To open in port so the engine cannot be started.
To drain off water and condensate from the cylinder.
To release gas from the cylinder by operating turning gear.
To release excessive gas pressure from the cylinder.
118) What force makes a safety valve of a diesel engine open?
The starting air pressure admitted in the cylinder.
The exhaust gas pressure.
The fuel pressure to the cylinder head.
The pressure inside the combustion space.
119) At which moment exactly does the safety valve of a diesel engine open?
At top dead point of the cylinder by max firing pressure.
When too much starting air is admitted.
When the gas pressure in the engine exceeds the spring pressure.
When fuel was retained previously in the cylinder.
120) In which stage of its working process is this two-stroke diesel engine?
Compressing.
Firing.
Gas expanding.
Scavenging.
121) What type of engine is shown here?
A two stroke diesel with loop scavenging.
A two stroke diesel with spiral scavenging.
A two stroke diesel with uniflow scavenging.
A two stroke diesel with piston underside scavenging.
122) If you are taking crankshaft deflections, for which position will you list the reading which
was last taken if the engine turns counterclockwise ? Right is PS, left is SB.
Zero
P
S
TS
123) What is the structural lay-out of this diesel engine?
Foundation, one-piece motor block.
Separate bedplate, columns, cylinder block for each cylinder.
Separate bedplate, one part crankcase and cylinder block.
One unit foundation and bedplate, separate cylinder block.
124) A piston of this type is composed of the following main parts:-
