This Blog is dedicated to all Marine Engineers preparing for MEO class IV exams. The questions covers all functions (Ship Stability, Marine Electro Technology, Marine Engineering Knowledge, Marine Safety and Marine engineering Practice).
2. Function of a de-superheater is to : choose one Protect superheater from overheat Control superheater steam outlet temperature Increase the efficiency of the boiler Reduce steam temperature for auxiliary uses after steam superheater
3. Which of the following statements is false? choose one Oxidation of lubricant leads to decrease in its viscosity Formation of oxidation acids, sulfuric acid leads to depletion of TBN of lubricant Contamination with water will lead to decrease in the load carrying capacity of a lubricant . Build up of insolubles will lead to increase in viscosity of a lubricant
4. 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 _________________ choose one Late start of injection and early end of injection Early start of injection and late end of injection Early start of injection and early end of injection Late start of injection and late end of injection
5. Which of the following conditions is responsible for the fuel oil to atomize when using a steam atomizer in anauxiliary boiler? choose one Expansion of the steam in the furnace. Expansion of the steam in the whirling chamber. Expansion of the steam in the orifice plate All of the above.
Score = Correct answers:
2. 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 ____________ choose one Seal jacket cooling water, act as secondary seal in case 1st o-ring leaks Seal jacket cooling water, Seal scavenge air Seal scavenge air, Seal Jacket cooling water Seal combustion gases, Seal jacket cooling water
3. The coating which is provided on the valve stem of exhaust valves of modern marine diesel engines is of: choose one Nickel Stellite Chromium Nimonic
4. 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 choose one faulty photocell detector low steam pressure high voltage on the ignition electrode open air damper
5. A large, low-speed, main propulsion diesel engine uses sea water to directly cool the choose one cylinder heads exhaust valves scavenging air injectors
2. What is the purpose of the inlet grid provided within the exhaust gas casing in the gas flow path ,prior entry to turbocharger ? choose one To filter out any unburnt carbon To absorb and dampen the pressure fluctuation To reduce noise in the constant pressure exhaust piping To prevent any broken piston rings finding their way to turbine
3. Which of the following factors governs the lower limit of thrust bearing clearance ? choose one To allow some oil leakage to prevent overheating Reduction of oil viscosity Alignment of crankshaft To allow the thrust pads to tilt and generate the oil wedge
4. Which of the following statements is true, about slow speed engines? choose one A scavenge fire can lead to a crankcase explosion A scavenge fire can lead to deformation of diaphragm plate A scavenge fire can lead to damage to tie rods. All of the above.
5. Which of the following can result in cracking of piston crown? choose one Deposits in cooling spaces Impingement of fuel due to faulty injection Insufficient piston cooling oil flow All of the above
2. The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent choose one accidental dry firing and overpressure uncontrolled fires in the furnace explosions in the boiler furnace overheating
3. Directional intake ports in diesel engines are used to choose one reduce air charge turbulence induce air swirl deflect hot combustion gas away from the valves oppose the effects of piston induced squish
4. Why does a chain stretch in service ? choose one Due to plastic elongation Due to high temperature expansion Due to wear on rollers and bushes Due to the phenomenon of creep
5. Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine? choose one Splash lubrication Pressure lubrication Sight feed lubricators Mechanical lubricators
2. In order to reduce thermal loading on the upper part of the liner and increase the effectiveness of cylinder lubrication, modern 2-stroke marine diesel engines are designed to have: Cermet coated piston rings, bore cooled liners and uniflow scavenging High top land of piston crown and deeper cylinder cover with top land of crown extending into cylinder cover at TDC Low top land of the piston crown with bore cooled cylinder liner Bore cooled cylinder liner and bore cooled piston crown with toroidal shape combustion chamber
3. Which of the following statements correctly describes the phenomenon of surging in a 2-stroke crosshead type engine? Due to sudden increase in engine load the exhaust gases may flow back through scavenge ports causing surge Due to sudden decrease in engine load the turbocharger pressure ratio drops . This causes high pressure downstream of T/C in scavenge trunk causing flow reversal of scavenge air Due to sudden increase in engine load , the T/C turbine rpm may increase suddenly increasing the compressor pressure ratio to surge Due to sudden decrease in engine load , the turbocharger may stall as the higher pressure downstream in exhaust system may cause reversal of flow of exhaust gases
4. What is meant by elastohydrodynamic lubrication? Formation of hydrodynamic film under high pressure with minor elastic deformation of mating surfaces, distributing load over a greater area Addition of extreme pressure additive (EP) to the lubricant Addition of Viscosity index improvement additive Addition of elastomer based additives
5. Which of the following will be required to be done in order to reduce sulphur corrosion of Main Engine components Increasing the atomization pressure of fuel injectors Fitting exhaust valves with valve rotators Running engine at or near normal sea load Decreasing the F.O. purifier feed rate , running two purifier in series one acting as purifier and other as clarifier
2. 58. Any steering gear system alarm can only be successfully acknowledged from __________ choose one The bridge The engine control room The steering compartment The ship's office
3. To check the setting of the overspeed trip on a diesel powered generator, you would use a choose one tachometer torsion meter dynamometer pony brake
4. Which of the following specifications/qualities of cylinder oils counter corrosive wear? choose one Viscosity TBN Detergency Specific Gravity
5. In a bypass type filtering system for a medium or high speed diesel engine, the lube oil bypassing the filter choose one returns directly to the suction side of the pump returns directly to the sump flows to the engine bearings flows through a second-stage strainer, reheater, and returns to the sump
2. For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because choose one changing filter elements would not interrupt engine operation filtering occurs twice in each pass of oil through the system clogging will not occur dropping pressure is half of that through a single filter unit
3. As per regulations, within how many hours before each departure, satisfactory working of thesteering gear must be checked? choose one 2 12 24 none of the above
4. Modern 4-stroke medium speed, marine diesel engine exhaust valve spindles are rotated by providing choose one Nozzle rings Tappet clearance Spinners or vanes Rotocaps
5. If the boiler tubes are scaled on the water side then :- choose one Heat conduction through the tubes will be very high leading to rapid evaporation The boiler furnace can get damaged due to excessive temperatures The surface of the tube will be overheated as heat transfer is impaired The natural circulation of water within the boiler will be more efficient
2. Piston rod stuffing box scraper rings butt clearances should: choose one Not be allowed to fall below 50% of original clearance Not be allowed to increase above 50% of original clearance Not be allowed to fall below manufacturer recommended value Not be allowed to increase above manufacturer recommended value
3. In a 2-stroke engine a ________________ separates the underpiston space from the crankcase. choose one A-frame Crosshead Diaphragm Scavenge space
4. Fusible plugs are installed in fire-tube boilers to choose one provide a means of draining the boiler warn the engineer of low water level cool the crown sheet at high firing rates open the burners' electrical firing circuits
5. Which of the following gauges are generally used to evaluate main bearing clearances? choose one Poker gauge Feeler gauge Telescopic feeler gauge Dial gauge
2. C off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs the flow of oil choose one directly to the fuel oil heater inlet for further warm-up back to the fuel oil settler for further filtration back to the suction side of the service pump directly to the deep tanks
3. If the tappet clearance between the rocker arm tappet and exhaust valve stem is excessive then: choose one The valve will open early and close later The valve will open later and close early The valve will open and close later The valve will open and close early
4. Which of the following conditions can lead to reduced power developed by a main engine? choose one High scavenge air temperature Choked air suction filter of a turbocharger Blow past in one or more units All of the above.
5. Which of the following types of diagrams would give an indication of effectiveness of exhaust and scavenge processes? choose one Power card Draw card Light spring diagram All of the above.
2. Which of the following is a proper practice to follow in the event of discovery of a small soot fire in exhaust gas boilers? choose one Repeated soot blowing Stopping cooling water circulation Reducing main engine speed Opening the inspection doors and extinguishing the fire
3. The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to choose one precipitate silica from solution reduce corrosion in the heating coil prevent clogging and erosion in the coil maintain zero water hardness
4. What does the NLGI number of a grease indicate? choose one The oxidation resistance of the grease The consistency of the grease i.e how fluid or non fluid Demulsibility of the grease The shelf life of the grease
5. Which of the bearings listed is most widely used for main and connecting rod bearings of modern diesel engines? choose one Steel-lined Poured babbitt, self-aligning Split roller Precision insert
