MARINE ENGINEERING SELF EXAMINER, MAINTENANCE- CAPT AJIT VADAKAYIL

MARINE ENGINEERING SELF EXAMINER, MAINTENANCE-  CAPT AJIT VADAKAYIL

The following is a SELF EXAMINER questionnaire .

If you are marine engineer at sea, find out what you are worth.

At sea you are only respected for what you are worth! A donkey on a throne is still a donkey!!

  

Grading:

Correct- plus two marks

Wrong - minus one marks

Did not attempt- minus two marks

  

Time allowed- 40 minutes

  

If you score less than 20% marks -- you are NOT an engineer.

1)Crank web deflection readings will give a positive indication of 

a)worn main bearing journals

b)torsional stress deformation

c)slack thrust bearings

d)bearing shells shim dimensions

 2)Which of the listed types of gasket material should be used on high pressure fuel oil lines on a diesel engine?

a)Fiberglass

b)Sheet asbestos

c)Neoprene

d)Soft copper

 3)While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface. You would, therefore, suspect that  

a)the bearing had been overheated

b)water was present in the oil

c)the lube oil was not being properly filtered

d)the maximum allowable bearing pressure had been exceeded

 4)If the coolant temperature is excessively low as it passes through the internally cooled fuel injectors, the injectors maybe damaged by 

a)water condensation in the fuel

b)corrosion of the nozzle tip

c)carbon deposits on the leakoff inlet

d)over lubrication of the needle valve

5) A cracked cylinder head on a diesel engine may be indicated by

a)excessive lube oil consumption

b)water draining from the fuel leak off valves

c)combustion gases venting at the expansion tank

d)excessive fuel oil consumption

 6)The principal hazard to personnel when a diesel nozzle tester is in use is

a)electrical shock

b)toxic fumes

c)explosion

d)blood poisoning

7) Which of the listed cylinder liner surface conditions indicates proper lubrication?

a)dull black appearance

b)bright appearance

c)thin layer of lacquer

d)thick oily film

 8)Because of the tolerances used in diesel engine fuel oil pumps, a worn plunger requires

a)grinding the spare plunger to the barrel

b)replacing the plunger and the barrel

c)highly polishing both the plunger and barrel

d)replacing plunger only

9)A well lubricated bearing surface always appears

a)well knurled

b)slightly streaked

c)lightly glazed

d)highly polished

 10)Uneven bolt tightening during the installation of a fuel injection pump can result in

a)binding of pump moving parts

b)ignition delay

c)high tortional shock to the fuel lines

d)improper pump-to-engine timing

 11)Which of the listed devices could be used as a substitute  for a ring groove tool?

a)steel brush

b)fine emery cloth or steel wool

c)a section of the removed compression ring

d)a case hardened scraper

12)After a long period of operation, a wear ridge, caused by piston ring action, will develop near the top of the cylinder liner. This ridge must be removed when piston rings are renewed in order to prevent

a)excessive wear during the seating period

b)excessive lubrication of the top ring

c)improper spreading of lubrication on the cylinder wall

d)breaking of the top ring, ring land, or both

 13)A properly honed diesel engine cylinder liner will

a)prevent piston ring wear

b)shorten the ring break-in period

c)prevent cylinder liner glazing

d)appear slick and glaze

  14)A diesel engine fails to start because of water in the fuel. In order to start the engine, you should

a)turn engine with jacking gear

b)drain filters and strainers and bleed off water at each injection pump

c)blow through the cylinders and fuel lines with a drying agent

d)all of the above

  15)If the piston ring gap remains insufficient when installing new rings, you should

a)install oversized  rings

b)hone the cylinder liner to allow ring installation

c)compress the rings tighter with a compressing tool

d)file the ends of the rings

16) When installing rings on a diesel engine piston, you should check the ring

a)diametrical tension

b)gap clearance

c)radial thickness

d)face thickness

 17)You are installing new piston rings on a single acting diesel engine piston. To check the ring gap clearance, the rings should be placed at the

a)point of minimum cylinder wear

b)center of the cylinder

c)point of maximum cylinder  wear

d)point of maximum ring wear

 18)Which of the copper alloys listed is commonly used in heat exchangers and possesses a high resistance to corrosion?

a)red brass

b)manganese bronze

c)copper beryllium

d)cupro-nickel

19)After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?

a)the relief valves in the system should be readjusted

b)-the filters and strainers should be checked frequently

c)all system pressure should be readjusted

d)the system should be drained and renewed with a fluid of different operating characteristics

 20)Moisture and impurities can be removed from pneumatic system by using

a)air intake heaters

b)desiccated suction strainers

c)multi-orificed suction valves

d)blowdown valves and filters

 21) Clearances between the impeller hub and casing of a centrifugal pump are checked with the use of

a)wooden wedges

b)an accurate set of feeler guages

c)a machinist's rule

d)a depth micrometer

 22)Copper sheet metal that is to be used as a gasket, is usually annealed by heating it to a cherry red color, and then

a)dousing it in cold water

b)cooling it slowly in air

c)quenching it slowly in oil

d)drawing its temper quickly

23) which is not correct—soon after the bridge gives FWE after berthing, the duty engineer usually—

a) puts off the aux blowers

b) puts ME on turning gear

c) opens scavenge and turbocharger drains

d) puts off the boiler water circulating pump.

24) All steam valves over 6” in dia must be fitted with

a)rising stem type valve

b)bypass line and valve

c)flange unions

d)steam lagging

25) A CO2 fire extinguisger must be recharged when it is found to be

a)15% below weight

b)5% below weight

c)20% below weight

d)10% below weight

26) Between the time of fixed CO2 alarm signal and actual delivery of CO2 to the system there is a time delay of

a)20 seconds

b)60 seconds

c)2 minutes

d)no delay

27) A canister type gas mask works on the principle of

a)filtering

b)chemical combination

c)aBsorbsion

d)all of above

28) The canister of an all purpose gas mask is installed by

a)removing top seal and inserting

b)removing bottom seal and inserting

c)removing top seal , inverting and inserting

d)removing top and bottom seals inverting and inserting

29) Which of the following valves is not contained in a SCBA set mouth piece

a)inhalation

b)saliva

c)exhalation

d)reducing

30) The reducing valve in a SCBA set reduces the pressure from 180 bars to

a)1.5 bar

b)1 bars

c)0.25 bars

d)0.05 bars

31) Death due to electrical shock will happen at a minimum value of

a)0.2 amperes

b)1 amperes

c)2 amperes

d)10 amperes

32) Diesel engine pistons are usually concave in shape because

a)it gives more volume of air

b)for conical atomization

for squish effect

d)all of the above

33) The diesel engine cylinder is secured at

a)the top end

b)bottom end

c)both ends are not secured

c)both ends are secured

34) The purpose of a silencer on the engine exhaust is to

a)deaden the explosive sounds

b)reduce the speed of the exhaust

c)reduce the temperature of the exhaust

d)all of above

35) The following valves in a 4 stroke engine are cam operated

a)inlet and exhaust

b)fuel

c)air starting

d)all of the above

36) following valves in the 2 stroke engine may not be cam operated

a)fuel

b)air starting

c)exhaust

d)supercharging

37) When there is carbon monoxide in the exhaust gases of a diesel engine

a)the air supply is in sufficient

b)carbon remains unburnt and passes off as soot

c)less heat is developed to be converted to work

d)all of above

38) Which of the statements is not true

a)the mean cylinder temperature of a 2 stroke engine is higher than  a 4 stroke engine

b)the exhaust temperature of a 2 stroke engine is higher than a 4 stroke engine

c)in a 2 stroke engine there is a power stroke every revolution and hence less time to dissipate heat

d)the low temperature scavenging air dilutes exhast gases lowering exhaust temperatures in a 2 stroke engine

39) Which of the statements regarding journal loads are not true

a)in a 2 stroke engine the bottom half of the crank pin bearing takes the whole wear

b)in a 2 stroke engine the bottom half of the main bearings receives the whole wear.

c)in a 4 stroke engine the crank pin bearing wear is divided but the top half receives a greater wear than the bottom half

d)in a 4 stroke engine the main bearing wear is divided but the bottom half receives a greater wear than the top half.

40) If there is afterburning in the cylinder or combustion takes place after the fuel injection valve closes, then which of the following is not true

a)combustion does not continue during expansion period of stroke

b)break down of MECYL lubrication takes place

c)overheated exhaust ports on 2 stroke engines

d)danger of exhaust trunk fires

41) Dribbling nozzles can cause-

a)after burning

b)detonation and crankcase dilution

c)loss of power

d)all of above

42) What could cause explosions of air compressor -

a)operating in inflammable fumes

b)intercooler or after cooler tubes getting holed

c)leaky oil or compression rings

d)all of above

43) The pipe from the air compressor to the air receiver should be

a)larger than the compressor discharge opening

b)smaller dia than the compressor discharge opening

c)same size

d)none of the above

44) What are the principal causes of air compressor valve and seat erosion

a)wire drawing of damp air

b)carbon formation

c)dusty intakes

d)all of above

45) What are the causes of air compressor overheating

a)broken valve strips

b)wrong direction of rotation

c)filter clogged

d)all of above

46) When you lay up a ship, like a FPSO, what precautions will you take with the cooling water system

a)there is no need for any precautions

b)keep the system full of fresh water

c)keep the system clean and dry

d)keep system full of solvent

47) What can reduce ignition lag in a ME cylinder

a)increase in compression ratio

b)increase in he air intake temp

c)overturbulence

d)all of above

48) On diesel generator which share load , the governor

a)speed droop is permanent

b)speed drop is adjustable

c)speed droop is not necessary

d)none of the above

49) The 2 stroke engine never has engine driven centrifugal blowers because

a)the air pressure developed is proportional to the square of the engine rpm

b)at low speeds the scavenge air pressure is too less

c)at high speeds the scavenge air pressure is too great

d)all of above

50) It is better to provide a large volume of cooling water with a slight temperature differential between inlet and outlet cooling lines , than to provide a lesser but colder flow, with the same outlet temp

a)to avoid vapour pockets and local hot spots

b)to avoid scale deposition

c)to avoid thermal shock to liner due to cold water inlet

d)all of above

51) Which of the following is not true

a)lubrication of a piston pin bearing is more efficient than a journal bearing

b)piston pin bearing has a rotary swinging motion

c)journal bearing has a rotary motion

c)there is no difference in lubrication efficiency

52) The inability of a governor to change the speed when a new load requires a change is called

a)deadbeat

b)hunting

c)instability

d)pooped

53) Which of the following is true

a)oil scraper rings used with splash lubrication system has the sharper edge downwards towards the crankcase

b)oil scraper rings used with individual lubricators have the sharper edge down wards  .

c)there is no difference whether it is splash or individual the sharp edge is always downwards

d)there are no sharp edges for scraping or oil control

54)Sea water has ppm salt

a)330 ppm

b)3300 ppm

c)33000 ppm

c)33 ppm

55)Select the nearest values. 1 HPa is

a)1000 mb

b)760 mm of Hg

c)1 atmosphere

d)all of above

56)Select the nearest values. 1 KPa is

a).01 kg

b)100 mm Aq

c).01 bars

d)all of above

57)Select the nearest value. 1 MPa is

a)10 kg

b)100 metres Aq

c)10 atmospheres

d)all of above

58)Select the nearest value. 1 KN/ M2 is

a)1KPa

b).01 kg

c)0.147 Psi

d)all of the above

59)In a “moment balance” type pressure transmitter, there is a balance between the input force and the balance force. The position is converted to pressure by the

a)pneumatic pilot relay

b)bellow

c)spring

d)flapper and nozzle

60)In a “ force balance” type differential pressure transmitter, when high pressure pushes the force beam, the flapper is pushed away from the nozzle. The balancing pressure will increase and move flapper

a)towards the nozzle

b)away from the nozzle

c)flapper maintains position

d)towards the diaphragm link

61)In a purged pipe liquid level measurement system , air is constantly bubble out from the

a)static line

b)standpipe

c)balance line

d)sight flow indicator

62)A pitot tube which works on kinetic energy displays

a)friction head

b)velocity head

c)pressure head

d)proportional head

63)A pitot tube which works on friction head displays

a)pressure drop

b)velocity drop

c)vacuum head

d)none of above

64)A pressure to position converter there is

a)a single input bellow

b)a single balance bellow

c)a input bellow and a balance bellow

d)no bellows at all supporting the force beam

65)According the Bernoulle’s theory the sum of the following is a constant

a)pressure head and velocity head

b)gravity head and vel head

c)pressure head and gravity head

d)none of the above

66)For an instrument calibrated by iso-Butane 100% LEL is how much by volume of HC

a)1.8%

b)1%

c)10%

d)none of above

67)one Micron is how much in terms of millimeters

a)1/ 1000 mm

b)1/ 100 mm

c)1/ 10000 mm

d)1/ 10 mm

68)1% of LEL is

a)10 ppm

b)100 ppm

c)1000 ppm

d)1 ppm

69)1% by volume of HC is

a)10000 ppm

b)1000 ppm

c)100 ppm

d)100000 ppm

70)1 ppm of chlorides in water means

a)1 mg/ litre

b)1 mg/ cum

c) 1 mg/ cc

d)none of above

71) With the compensating needle screw of a Woodward regulator is closed, what will happen when the load is changing?

a)Woodward regulator will regulate very slowly

b)Woodward regulator will regulate very fast

c)Woodward regulator will not regulate at all

d)Woodward regulator will regulate normally

ANSWERS

1A
2D
3C
4B
5C
6D
7B
8B
9D
10A
11C
12D
13B
14B
15D
16B
17A
18D
19B
20D
21B
22B
23D
24C
25D
26A
27D
28D
29D
30C
31A
32D
33A
34D
35D
36C
37D
38C
39A
40A
41D
42D
43C
44D
45D
46C
47D
48B
49D
50D
51A
52A
53A
54C
55D
56D
57D
58D
59A
60A
61B
62B
63A
64C
65D
66A
67A
68B
69A
70A
71A

CAPT AJIT VADAKAYIL
29 YEARS IN COMMAND
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