MEO Classs 4 Objective Questions and Answers part 1

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41. Which of the following is an example of a solid bearing?

A. Piston pin bushing
B. Turbo-generator turbine bearing
C. Spring bearing
D. Thrust bearing

A. Piston pin bushing

42. Function of a de-superheater is to:

A. Protect superheater from overheat
B. Control superheater steam outlet temperature
C. Increase the efficiency of the boiler
D. Reduce steam temperature for auxiliary uses after steam superheater

D. Reduce steam temperature for auxiliary uses after steam superheater

43. Which of the following specifications/qualities of cylinder oils counter corrosive wear?

A. Viscosity
B. TBN
C. Detergency
D. Specific gravity

B. TBN

44. Marine boilers burning H.F.O. face a problem of cold corrosion due to high sulphur content. The minimum flue gas temperature within any boiler part is kept above due point of H2SO4. The actual dew point of H2SO4 in flue gases depends on the:

A. Boiler furnace temperature
B. Ambient air temperature
C. Boiler operating pressure
D. HFO sulphur content and moisture in combustion air

D. HFO sulphur content and moisture in combustion air

45. If an operating auxiliary boiler has a water pH reading of 7, you should

A. bottom blow the boiler
B. treat the water with caustic soda
C. treat the water with chemical scavengers
D. reduce the water alkalinity to recommended readings

B. treat the water with caustic soda

46. For a two stroke engine two o-rings are provided on the liner. The function of the top
o-ring is to ___________ and function of the lower o-ring is to ____________

A. Seal jacket cooling water; act as secondary seal in case 1st o-ring leaks
B. Seal jacket cooling water, Seal scavenge air
C. Seal scavenge air, Seal Jacket cooling water
D. Seal combustion gases, Seal jacket cooling water

B. Seal jacket cooling water, Seal scavenge air

47. In case of 2-stroke marine diesel engines, the top part of the liner forming the combustion chamber experiences very high pressure induced mechanical stresses as well as high thermal stresses. Which of the following is a correctly designed liner for catering both the above stresses?

A. Thick top portion with jacket cooling to take care of both the high mechanical and thermal stresses
B. Thick top portion to take care of high mechanical stresses while bore cooling to reduce thermal gradients
C. Thin top portion to reduce thermal gradients and hence thermal stresses while supporting ribs to take care of mechanical stresses
D. Thick top portion to take care of high mechanical stresses with jacket cooling combined with allowance for thermal expansion to minimize the thermal stresses

B. Thick top portion to take care of high mechanical stresses while bore cooling to reduce thermal gradients

48. 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

A. worn main bearing journals

49. Prior to lighting off a cold automatically fired auxiliary boiler, you should

A. check and regulate the water level
B. close the air cock once fires are lit
C. blow down the gauge glass
D. crack the steam stop to assure protective steam flow

A. check and regulate the water level

50. Sudden stop of diesel engine (Multiple Choices)

A. air in system
B. water in system
C. air filter chocked
D. water in air filter

A,B,C