Marine Engineering knowledge (Motor) online questions

1.Which standards govern the specifications for supply of Residual Marine Fuels and Distillate Marine Fuels onboard merchant ships?
A.ISO 3012:1999
B.ISO 3648:1996
C.ISO 8216-1:2010
D.ISO 8217:2010

2.Crank web deflection readings will give a positiveindication of
A.worn main bearing journals
B.torsional stress deformation
C.slack thrust bearings
D.bearing shells shim dimensions

3.ESD stands for which type of boiler
A.External superheater D-type
B.Emergency shutdown Boiler
C.Extreme Superheat type
D.External Superheat De-superheater type

4 )The advantage of tie rods over an engine without tie rods is that:
A.The engine is very easily aligned after any misalignment has taken place between different components of the engine
B.The engine doesn???t require thrust pads for transmission of thrust to the ship???s hull as the same is being taken care of by the tie rods
C.The engine components are much lighter leading in overall reduction is engine weight with a high power generation with the elimination of fatigue stresses
D.There are no advantages of engines with tie rods, because tie rods require regular maintenance and replacement like connecting rods and overall engine becomes more expensive to operate

5) 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

6) In order for microbiological growths to thrive in a fuel tank it is necessary for
A.high temperatures to exist
B.low temperatures to exist
C.small amounts of water to be present
D.large amounts of water to be present

7) 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

8) The purpose of an air cooler in a supercharging system is to :
A.Reduce temperature of supercharged air in order to condense and remove maximum possible moisture from the air prior entry to the engine
B.Reduce the temperature of the supercharged air in order to increase the density & also to cool down below dew point to remove moisture from air prior entry to the engine
C.Cool supercharged air to increase its density such that the dew point is not reached to avoid entry of moisture into the engine
D.Cool supercharged air to increase it???s density and also to keep the peak temperature and exhaust gas temperature within limits


9] Use of Halon as fire extinguishing medium has been discontinued because________________
A.It is highly toxic
B.It is expensive
C.It has high Ozone depleting potential
D.It leads to acid rains

11) In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy steels because
A.the beveled edges of the intake valves provide forself-centering during seating
B.intake valves utilize stellite-coated valve seat insertswhich reduce wear
C.the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
D.intake valves are less affected to the corrosive action of exhaust gases

12) Why is it essential to renew turbocharger bearings after a preset number of hours of running even if the bearings are in seemingly perfect condition?
A.Because they are prone to failure due to prolonged exposure to high temperature conditions.
B.Because they are subject to cyclic loading and are prone to failure due to metal fatigue.
C.It is not essential to renew if condition monitoring suggests perfect condition.
D.Lube oil contamination is bound to occur and affect the condition of the bearings.

13) Which of the following statements is true?
A.The rotary vane type steering gear generally operates at higher oil pressures than the ram type .
B.The ram type steering gear generally operates at higher oil pressures than the rotary vane type .
C.Both ram type and rotary vane type steering gears generally operate at similar oil pressures
D.None of the above

14) What is the purpose of the inlet grid provided within the exhaust gas casing in the gas flow path ,prior entry to turbocharger ?
A.To filter out any unburnt carbon
B.To absorb and dampen the pressure fluctuation
C.To reduce noise in the constant pressure exhaust piping
D.To prevent any broken piston rings finding their way to turbine

15) Which of the following is a disadvantage of water as cooling medium for pistons, when compared to oil?
A.Chemical treatment is required
B.Higher thermal stresses in piston
C.Piston of more complicated design
D.All of the above

16) How is the concentration of dissolved oxygen in the feedwater of an auxiliary boiler maintained at acceptable limits?
A.Feedwater is cycled through a DC heater.
B.Feedwater is treated with phosphates.
C.Oxygen is liberated in the three-stages of feedwater preheating.
D.Oxygen is liberated by maintaining the highest practical feedwater temperature

17) In a 2-stroke marine diesel engine if the o-ring for Jacket cooling water sealing is leaking then:
A.The water will leak directly into the crankcase
B.The water will leak into the underpiston space
C.The water will come out through tell-tale hole provided between the two o-rings
D.The water will come out from the top of cylinder jacket

18) The lube oil pump used in a diesel engine is a
A.volute pump
B.centrifugal pump
C.diaphragm pump
D.gear pump

19) 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.blowdown the gage glass
D.crack the steam stop to assure protective steam flow

20) Steam temperature control for the ESD-II boiler is achieved by :
A.Fitting a de-superheater between 1st & 2nd passes of superheater
B.Fitting an attemperator between 1st & 2nd passes of superheate
C.Gas dampers in boiler uptake
D.Bypassing the superheater