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Q

The term 'pour point' is defined as the lowest Rapidly By gravity through a standard orifice at a rate of 60cc per
1 temperature at which lubricating oils will flow . at a specified temperature second B
Which of the following statements is used to describe Texture of the grease Temperature at which Type of soap used in its Temperature below
the term 'base' in reference to greases? under load. the grease softens or production. which the grease will
C
melts. be ineffective as a
2 lubricant.
A grease lubricated ball bearing or roller bearing will fills only 10% of all void has a high grease is thinned with a suitable is heated prior to
run cooler if the grease. spaces within the penetration number (is lubricating oil packing the bearing A
3 bearing hard)
A good quality oil used in main propulsion engine free from all chemical quickly chemically resistant to permanent readily saponified with
C
4 lubrication systems should be . additives oxidized emulsification water
Which of the following problems may be encountered External seal leakage. Hunting due to fast Hydraulic oil film Increased power
by using an oil having a viscosity higher than that response. breakdown. consumption. C
5 specified for an operating hydraulic system?
The function of lubricating oil is to . maintain even maintain a constant oil maintain a pressurized remove entrained
distribution of bearing temperature fluid film between moving water C
6 wear surfaces
Oil emulsification in engine lubricating oils will tend to . decrease sludge cause water to separate improve the lubricating oil displace lubricating oil
formation in lubricating from the oil viscosity required in areas of D
7 oil friction
One characteristic of a lubricating oil adversely high TBN value low oil floc point low oil demulsibility low oil neutralization
C
8 affecting the results of centrifuging is . number
Which of the following problems occurring in a Seal deterioration Fast response and Increased power Oil film breakdown
hydraulic system can be caused by the use of an oil hunting consumption D
9 having a viscosity lower than specified?
The degree to which the viscosity of an oil will change weight designation viscosity index pour point thermal change value
B
10 with a change in temperature is indicated by the.
Which of the processes listed consumes the greatest Overcoming sliding Overcoming rolling Overcoming fluid friction Overcoming oil wedge
amount of power while producing the greatest amount friction friction friction D
11 of heat?
Which of the following statements is correct regarding A large change of No change in viscosity Very little change in The viscosity of the oil
an oil with a high viscosity index? viscosity occurs with a occurs with any change viscosity occurs with a increases with an
C
minor change in in temperature. significant change in increase in
12 temperature. temperature. temperature.
Clearence between the
B
Hydrodynamic lubrication depends on Oil temperature rubbing surfaces Oil density demulsibility
An organic solid lubricant, such as graphite, is suitable machinery bearings antifriction bearings on bearings subject to line shaft bearings
as an oil additive when used in. subjected to high general service pumps fluctuating loads D
13 temperatures
The greatest difference between absorbent and will remove additives soak up liquid do not create pressure attract or have liquid
adsorbent filters is that absorbent filters. from the lube oil contaminants directly drops in the lube oil contaminants stick to
D
into the filter media system the surface of the filter
14 media
Adsorption filters are not commonly used in steam utilize exotic and are only effective at can adsorb no more than remove additives from
turbine or diesel engine lubricating systems because expensive filtering temperatures below five times their weight in the lube oil
C
they. media making them too 100°F water
15 costly for use.
 A filler commonly mixed with grease, such as graphite, as a mild abrasive to smooth surface to lower the friction all of the above
D
16 acts. irregularities coefficient
Demulsibility of a lube oil is defined as. the ability of oil to the temperature at which a measure of the water in an emulsion of
C
17 separate from water oil flows rapidly a lube oil system different grades of oil
The ability of an oil to separate cleanly from an oil and precipitation number neutralization number pour point demulsibility
B
18 water mixture is referred to as its.
Which of the following statements describes the Liquids with different Liquids with different Viscosity and specific Viscosity and specific
relationship between viscosity and specific gravity? viscosities will always viscosities will never gravity are directly gravity are not related
have the same specific have the same specific proportional. in that one does not D
gravity. gravity. define or limit the
19 other.
An additive used to improve the ability of a lube oil to suppressant additive dispersant additive extreme pressure additive viscosity improver
C
20 reduce friction is known as a/an additive
Which of the additives listed is used to reduce the Emulsifiers Suppressants Depressants Extreme pressure
B
21 foaming tendency of lube oil?
Which of the additives listed is used to lower the pour Emulsifiers Suppressants Depressants Extreme pressure
B
22 point of a lubricating oil?
The pour point of lubricating oils is affected the most by Extensive centrifuging Wax content Water content Acid content
B
23 which of the following?
TBN value of lube oil is expressed as mg KOH/g oil mg Ca(OH)2/g oil mg KOH/Kg oil mg KOH/Kg oil A

Hydrodynamic lubrication depends on Oil temperature Oil density Oil viscosity None of the choices C
The viscosity of an oil is a measure of its. weight internal friction demulsibility S.A.E. number
24 B
Although lube oils used in the main lubricating service are exposed to a come in contact with are reduced in become extremely
systems should have a relatively high flash point to vacuum extremely hot surfaces temperature to just above agitated or aerated
B
avoid ignition, they can create smoke and fire hazards the pour point
25 when they
The flash point of most lube oils used in a main 80°F to 100°F 140°F to 160°F 250°F to 300°F 350°F to 450°F
D
26 lubricating system should be approximately
Which of the listed characteristics of lube oil are the Ash content, carbon Viscosity, acidity, and Pour point, flash point, and Autoignition point,
most important to the engineer from an operational residue, and gravity demulsibility precipitation number viscosity index, and B
27 standpoint? film strength
When normal operating pressure is applied to the viscosity will decrease volume will increase volume will decrease pour point will be
B
28 hydraulic oil used in a high-pressure system, the oil reduced
Which characteristic or condition will have the greatest Pour point Cloud point Vacuum Pressure
D
29 effect on increasing a hydraulic oil's viscosity?
On board most contaminants from lube oil can be acid fuel oil sediment water
removed. A contaminant which will remain in the lube B
30 oil after Treatment/filtering is.
Sludge may form in the lubricating oil crankcase of a wax precipitation in the contamination by dust, refrigerant bubbles in the refrigerant reducing
B
31 reciprocating air conditioning compressor as a result of. lube oil scale, or moisture lube oil the lube oil viscosity
Which of the additives listed will maintain the Floc point Suppressant Dispersant All of the above.
32 suspension of fine residue particles in lube oil?
If the chemical analysis of a lube oil sample taken from acidity has increased viscosity has decreased demulsibility has improved foaming is guaranteed
the main propulsion machinery indicates an increased to occur A
33 neutralization number the.
 A hydrometer measures specific gravity by comparing density of a substance differences in weight mass of substance buoyancy of an object
the. in water with the density between water and the measured with the density in water with the
of the same subject in liquid measured of the same substance buoyancy of the same A
air object in the liquid
34 being measured
Max allowable water content for Trunk type engine 0.10% 0.20%
35 0.25% A
Max allowable water content for cross head type 0.20% 0.10%
36 engine 0.25% B
What are the effects of lube oil contamination by water increased viscosity Microbial degradation increased sp gravity lowerering of flash
37 point B
What does the crackling sound indicate when lube is Presence of fuel oil Presence of water presence of insolubles
38 heated in a test tube D
Lube oil analysis reveals the presence of vanadium. from bushes & bearings Heavy fuel From piston rings
39 From where could this vanadium come? contaminations B
White metal of bearings comprises of Bronze+Antimony+Cop Zinc+Antimony+Copper Tin+Antimony+Copper Tin+Antimony+Alumini
40 per um A
Moderate Thermal Low Thermal High Thermal
41 Lube oil used should have conductivity conductivity No Thermal conductivity conductivity D 1
Low demulsification High demulsification
42 To remove water from Lube oil, the lube should have number number Low Viscosity index High Viscosity index B 1
43 Spot test on board ship shows the amount of Water content in lube oil Fuel dilution in Lube oil Insolubles in lube oil Ash content in lube oil C -0.25
Improper centrifuging of Calcium laquer deposits Sludge formation with
44 Using MECC lube oil of high BN can cause water on bearings water in ME sump all the choices D
Using high BN ME cyl oil & then suddenly the ship has
to use loww sulphur 380 cst HFO due to SECA area Reduce the feed of Increase the feed of Do not change the feed Increase the BN of Cyl
45 entry then MECYL oil MECYL oil rate oil D
Lubricating systems for diesel engines are usually
46 designed to initially provide lube oil to Camshaft Main bearings Crank bearings Piston crown B
Foaming of oil due to
Deficiency of oil supply causing exhaust valve air ingress at pump
47 hammering can be due to suction High viscosity of oil High oil temperature all the choices D
During inspection of crank bearing of one of the units of
the diesel engine, the bearing shell was found as
follows. The surface of the white metal was black &
very hard. Patches of black incrustations have caused Bearing lifetime has Wrong casting of
48 grooves in the journal. What could be the cause Water in lube oil Dirt in lube oil exceeded bearing shell B
To avoid high To get the oil into the
Why is it important to check the timing of the Cylnder oil To get the right amount temperature in the cylinder when the piston is To avoid excess
49 lubricators of oil into the cylinder combustion chambe in the right position lubrication A
To neutralise the
sulphur & get an oil film To form an oil film
between the piston To neutralise the sulphur in between the piston
50 Why do we use cylinder oil rings & the liner To simply avoid blowby the fuel oil rings & liner A
Viscosity does not
matter with the To keep an oil protective Lube oil viscosity has no
Why is it important to keep thel ube oil viscosity within performance of the film between the rubbing influence on the oils
51 safe limits engine surfaces lubrication ability To avoid over heating B
 You have checked the lube viscosity of the aux engine
with a lube oil test kit & found the viscosity to be low. Clean the system & Increase the lube oil Decrease the lube oil
52 What will you do renew the lube oil temperature temperature Start to purify the oil B
You have checked the lube viscosity of the aux engine
with a lube oil test kit & found the viscosity to be high. Increase the lube oil Clean the system & renew Decrease the lube oil
53 What will you do temperature Start to purify the oil the lube oil temperature D
Heavy fuel oil leakage Diesel oil leakage into Wrong lube oil
54 What is the cause for lube viscosity decrease into the lube oil system the lube oil system Low lube oil temperature pressure C
Start purifying Segrgate the oil in a Boil out the water by
Water content in the lube system is found slightly It is no danger with that continuosly with lube oil separate tank & start increasing the
55 higher than 2%. What should you do percentage pumps running puryfying temperature B
In Hydrostatic lubrication, the oil film between the
56 rubbing surfaces depends on Viscosity Oil temperature Oil density None of the choices A
Relative speed between
57 Hydrodynamic lubrication depends on the surfaces Oil temperature Oil density None of the choices A
TBN value of the lube oil of a Trunk type engine is
58 normally 10 mg KOH/g oil 20 mg KOH/g oil 30 mg KOH/g oil 40 mg KOH/g oil C
Higher the viscosity of the lubricant, higher the friction Thinner the hydronamic No effect on the Thicker the hydronamic
59 between oil and shaft but film thickness of film film None of the choices C
In an Lube oil analysis report, Aluminium was found,
60 What could be the source Piston Bearing Both the choices None of the choices B
In an Lube oil analysis report, Antimony was found,
61 What could be the source Thrust washers Bearings Turbine blades Neoprene seals C
In an Lube oil analysis report, Antimony was found,
62 What could be the source Bearings Bearing cages Solder all the choices C
In an Lube oil analysis report, Titanium was found,
63 What could be the source Compressor blades Bearings Pistons Grease A
In an Lube oil analysis report, Calcium was found,
64 What could be the source Detergent Additives dispersant additive None of the choices Both the choices D
In an Lube oil analysis report, Nickel was found, What
65 could be the source Turbine Blades Liner Bearing None of the choices D
In an Lube oil analysis report, Chromium was found,
66 What could be the source Liner Pistons ome additive Piston rings D
67 The temperature at which Bannanas are carried is 11 - 15 Deg C 10 - 12 Deg C 8 - 9 Deg C 4 - 5 Deg C A