Which of these fuel oil impurities can cause maximum abrasive damage?
What is meant by elastohydrodynamic lubrication?
Which of the following statements correctly describes the phenomenon of surging in a 2-stroke crosshead type engine?
Fins are installed on the generating tube surfaces in waste heat boilers to
How is the concentration of dissolved oxygen in the feed water of an auxiliary boiler maintained at acceptable limits?
Exhaust Grouping is required in case of ______________ turbocharging in order to
Labyrinth seal fitted on the back surface of a compressor wheel of a turbocharger:
Which of the following statements is true?
After prolonged operation, jerk type fuel pumps wear on the top edge of plunger and edges of spill ports and helix due to erosion by high pressure fuel as it spills. This wear would result in
In a 2-stroke marine diesel engine if the o-ring for Jacket cooling water sealing is leaking then
Crank web deflection readings will give a positive indication of
Use of Halon as fire extinguishing medium has been discontinued because
It is a known fact that centrifugal pumps require priming for pumping liquids , as they cannot handle air and will lose suction due to air entry . But on the other hand T/Cs use centrifugal compressors for supercharging. Which of the following do you think makes a centrifugal compressor to pump air and behave differently than the centrifugal pumps?
The purpose of an air cooler in a supercharging system is to:
Which of the following conditions is responsible for the fuel oil to atomize when using a steam atomizer in an auxiliary boiler?
Which of the following is a reasonable statement about water washing of turbine side of a T/C ?
Which of the following statements is false?
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 large, low-speed, main propulsion diesel engine uses sea water to directly cool the
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?
Modern marine turbochargers use a ___________ type of compressor
In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy steels because
Which of the following specifications/qualities of cylinder oils counter corrosive wear?
Steam temperature control for the ESD-II boiler is achieved by :
If an operating auxiliary boiler has a water pH reading of 7, you should
The lube oil pump used in a diesel engine is a
The waterWhich standards govern the specifications for supply of Residual Marine Fuels and Distillate Marine Fuels onboard merchant ships? from discharge side of the centrifugal pump is supplied as sealing water to the stuffing box for the pump shaft at:
Which type of boiler burner has max turn down ratio?
ESD stands for which type of boiler
Which of the following is an example of a solid bearing?
Prior to lighting off a cold automatically fired auxiliary boiler, you should
If the combustion control system of an automatically fired auxiliary boiler fails to sustain burner ignition after a normal shutdown, you should check for a/an
In a bypass type filtering system for a medium or high speed diesel engine, the lube oil bypassing the filter
In modern marine 2-stroke diesel engines, ________________ is sometimes used as a coating on the underside of the exhaust valve disc, to reduce the rate of hot corrosion.
Irregular circumferential wear of liner due to diminishing neutralizing capacity of cylinder oil away from lubricating holes is known as:
What do you mean by surge limit of a turbocharger?
Some 4-stroke engines are fitted with a rotorcap on the cylinder head valves. For what reason?
To check the setting of the over speed trip on a diesel powered generator, you would use a
The advantage of tie rods over an engine without tie rods is that:
Which of the following is a disadvantage of water as cooling medium for pistons, when compared to oil?
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?
Any steering gear system alarm can only be successfully acknowledged from
If the boiler tubes are scaled on the water side then
The coating which is provided on the valve stem of exhaust valves of modern marine diesel engines is of:
Function of a de-superheater is to.
Which of the following statements is true, about slow speed engines?
In order for microbiological growths to thrive in a fuel tank it is necessary for
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 ____________
Even if there is an oil mist concentration inside a crankcase, and there is also a hot spot, crankcase explosion will only take place when