Which of the following statements is true, about slow speed engines?Ī. high voltage on the ignition electrodeĢ4. 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/anĬ. The coating which is provided on the valve stem of exhaust valves of modern marine diesel engines is of:Ģ3. Fitting an attemperator between 1st & 2nd passes of superheaterĢ2. Fitting a de-superheater between 1st & 2nd passes of superheaterī. Steam temperature control for the ESD-II boiler is achieved by :Ī.
#Objective questions on ic engines crack
crack the steam stop to assure protective steam flowĢ1. Prior to lighting off a cold automatically fired auxiliary boiler, you shouldĭ. The lube oil pump used in a diesel engine is aĢ0. The water will come out from the top of cylinder jacketġ9. The water will come out through tell-tale hole provided between the two o-ringsĭ.
The water will leak into the under piston spaceĬ. The water will leak directly into the crankcaseī. In a 2-stroke marine diesel engine if the o-ring for Jacket cooling water sealing is leaking thenĪ. Oxygen is liberated by maintaining the highest practical feed water temperatureġ8. Oxygen is liberated in the three-stages of feed water preheating.ĭ.
Feed water is cycled through a DC heater.ī. Which of the following is a disadvantage of water as cooling medium for pistons, when compared to oil?ġ7 How is the concentration of dissolved oxygen in the feed water of an auxiliary boiler maintained at acceptable limits?Ī. Modern marine turbochargers use a _ type of compressorġ6. Both ram type and rotary vane type steering gears generally operate at similar oil pressuresġ5. The ram type steering gear generally operates at higher oil pressures than the rotary vane type.Ĭ. The rotary vane type steering gear generally operates at higher oil pressures than the ram type.ī. Which of the following statements is true?Ī. Lube oil contamination is bound to occur and affect the condition of the bearings.ġ2. It is not essential to renew if condition monitoring suggests perfect condition.ĭ. Because they are subject to cyclic loading and are prone to failure due to metal fatigue.Ĭ. Because they are prone to failure due to prolonged exposure to high temperature conditions.ī. 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?Ī. intake valves are less affected to the corrosive action of exhaust gasesġ1. the volume of air passing through intake valves is less than the volume of air passing through exhaust valvesĭ. intake valves utilize stellite-coated valve seat insertswhich reduce wearĬ. the beveled edges of the intake valves provide forself-centering during seatingī. In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low-alloy steels becauseĪ. Use of Halon as fire extinguishing medium has been discontinued becauseġ0. Cool supercharged air to increase it?s density and also to keep the peak temperature and exhaust gas temperature within limitsĩ. Cool supercharged air to increase its density such that the dew point is not reached to avoid entry of moisture into the engineĭ. 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 engineĬ. Reduce temperature of supercharged air in order to condense and remove maximum possible moisture from the air prior entry to the engineī. The purpose of an air cooler in a supercharging system is to:Ī. HFO sulphur content and moisture in combustion airĨ. The actual dew point of H2SO4 in flue gases depends on the:ĭ. The minimum flue gas temperature within any boiler part is kept above due point of H2SO4. face a problem of cold corrosion due to high sulphur content. In order for microbiological growths to thrive in a fuel tank it is necessary forħ. Which of the following is an example of a solid bearing?Ħ. 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 operateĥ. The engine components are much lighter leading in overall reduction is engine weight with a high power generation with the elimination of fatigue stressesĭ. 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 rodsĬ.
The engine is very easily aligned after any misalignment has taken place between different components of the engineī. The advantage of tie rods over an engine without tie rods is that:Ī. Crank web deflection readings will give a positive indication ofĭ. Which standards govern the specifications for supply of Residual Marine Fuels and Distillate Marine Fuels onboard merchant ships?Ģ.
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