Set 21 - E Pariksha MEK Motor previous asked questions

1) 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

ANS- B

2) Modern marine turbochargers use a ___________ type of compressor

A.Radial flow

B.Axial flow

C.Mixed flow

D.Turbulent flow

ANS- A

3) 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

ANS D

4) 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

ANS D

5) 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

ANS C

6) The lube oil pump used in a diesel engine is a

A.volute pump

B.centrifugal pump

C.diaphragm pump

D.gear pump

ANS D

7) 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

ANS A

8) 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

ANS C

9) The ash content of a fuel oil is significant to the operating engineer because it

A. is an indication of the amount of noncombustible material present in the oil

B. indicates the quantity of energy released by burning a unit amount of the fuel

C. is useful for determining proper atomization temperatures

D. reflects the overall thermal efficiency of the fuel oil service system

ANS A

10.  Which of the following design features will reduce the possibility of overheating the top compression rings of a cast iron piston?

A. A nickel-bearing insert is cast into the top ring groove

B. A heat dam design is sometimes used in the piston head

C. The top ring is located as close to the piston rim as possible

D. The inside surface of the piston head is rounded into the ring bell

ANS B

Marine Engineering Knowledge (Motor) E Pariksha online exam questions and answers for MEO class 4 exam

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• Set 1 MEK Motor
• Set 2 MEK Motor
• Set 3 MEK Motor
• Set 4 MEK Motor
• Set 5 MEK Motor
• Set 6 MEK Motor
• Set 7 MEK Motor
• Set 8 MEK Motor
• Set 9 MEK Motor
• Set 10 MEK Motor
• Set 11 MEK Motor
• Set 12 MEK Motor
• Set 13 MEK Motor
• Set 14 MEK Motor
• Set 15 MEK Motor
• Set 16 MEK Motor
• Set 17 MEK Motor
• Set 18 MEK Motor
• Set 19 MEK Motor
• Set 20 MEK Motor
• Set 21 MEK Motor
• Set 22 MEK Motor
• Set 23 MEK Motor
• Set 24 MEK Motor
• Set 25 MEK Motor
• Set 26 MEK Motor
• Set 27 MEK Motor

Set 20 MEK Motor

1. Use of Halon as fire extinguishing medium has been discontinued because________________
It is highly toxic
It is expensive
It has high Ozone depleting potential
It leads to acid rains

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

3. In order for microbiological growths to thrive in a fuel tank it is necessary for
high temperatures to exist
low temperatures to exist
small amounts of water to be present
large amounts of water to be present

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

5. 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?
Because they are prone to failure due to prolonged exposure to high temperature conditions.
Because they are subject to cyclic loading and are prone to failure due to metal fatigue.
It is not essential to renew if condition monitoring suggests perfect condition.
Lube oil contamination is bound to occur and affect the condition of the bearings.

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Set 19 MEO class 4 exam MEK Motor online questions

1. Irregular circumferential wear of liner due to diminishing neutralizing capacity of cylinder oil away from lubricating holes is known as:
choose one Micro seizure Scuffing Scoring Clover leafing

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

3. Crank web deflection readings will give a positiveindication of
choose one worn main bearing journals torsional stress deformation slack thrust bearings bearing shells shim dimensions

4. ESD stands for which type of boiler
choose one External superheater D-type Emergency shutdown Boiler Extreme Superheat type External Superheat De-superheater type

5. Which of the following is an example of a solid bearing?
choose one Piston pin bushing Turbo-generator turbine bearing Spring bearing Thrust bearing

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Set 18 - E Pariksha MEK Motor MEO class 4 questions

1. The main function of tie rods in the construction of large, low speed diesel engines is to
stiffen the bedplate in way of the main bearings to increase the engine's longitudinal strength
accept most of the tensile loading that results from the firing forces developed during operation
mount the engine frame securely to the hull to prevent shaft coupling misalignment
connect the crosshead solidly to the piston rod

2. The fall in speed that occurs in a diesel engine equipped with governor, on increase of load is called:
Offset
Speed drop
Speed droop
Speed offset

3. What do you mean by surge limit of a turbocharger ?
Characteristic curve of a turbocharger
Portion of compressor characteristic curve which lies on the left side of the point of maximum pressure
A line joining all the points of maximum pressure on compressor characteristic curves , drawn at various speeds of operation
Maximum rpm limit of T/C above which surging will start

4. 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 ?
Thick top portion with jacket cooling to take care of both the high mechanical and thermal stresses
Thick top portion to take care of high mechanical stresses while bore cooling to reduce thermal gradients
Thin top portion to reduce thermal gradients and hence thermal stresses while supporting ribs to take care of mechanical stresses
Thick top portion to take care of high mechanical stresses with jacket cooling combined with allowance for thermal expansion to minimize the thermal stresses

5. Which of the following is a reasonable statement about water washing of turbine side of a T/C ?
It leads to thermal shock and reduces the life of the T/C
It leads to thermal shock and not so effective as solid washing
If properly carried out keeping rpm , load ,temperature limits & other factors into account , it is quite safe and more effective than solid washing
It should never be carried out as most of the engine manufacturers recommend against the same

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Set 17 Marine engineering Knowledge (Motor) online MCQ questions with answers

1. 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 compressors to pump air and behave differently than the centrifugal pumps?
choose one Presence of air cooler Presence of Labyrinth seal High speed of rotation , very fine internal clearences and large impeller diameters Difference in principle of operation

2. If an operating auxiliary boiler has a water pH reading of 7, you should
choose one bottom blow the boiler treat the water with caustic soda treat the water with chemical scavengers reduce the water alkalinity to recommended readings

3. 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_________________
choose one The hot spot provides the ignition temperature for the oil mist concentration When the oil mist - air mixture is in the flammable range Both A and B None of the abov

4. Which of these fuel oil impurities can cause maximum abrasive damage?
choose one Weter Ash Catalytic Fines Sodium

5. Steam temperature control for the ESD boiler is achieved by :
choose one Fitting a de-superheater between 1st & 2nd passes of superheater Fitting an attemperator between 1st & 2nd passes of superheater Bypassing the superheater Gas dampers in boiler uptake

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Set 16 - MEO class 4 motor questions

1. Exhaust Grouping is required in case of ______________ turbocharging in order to _____________________
choose one Constant pressure , prevents shockwave generation Pulse pressure , prevent interference with scavenging of other cylinders Constant pressure, prevent interference with scavenging of other cylinders .Pulse pressure , prevents shockwave generation

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.

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Set 15 MEO class 4 Epariksha online questions for MEK Motor

1. When using low sulfur fuel oil for Emission Control Areas (ECA???S), ideally the TBN of the cylinder oil used should be:
choose one Lower than normal Higher than normal Same as normal Same as normal if the feed is kept higher

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

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Set 14 Mek motor questions

1. External fouling of boiler tubes can lead to :
choose one Greater steam generation Tube corrosion Tube Erosion Protection of tube against corrosion

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

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Set 13 - MEK Motor MCQ for Epariksha

1. Which of the following types of damages are metal seatings of a valve subject to?Choose the correct alternative.
choose one Corrosion, Erosion, Abrasion, Deformation Corrosion, Fatigue failure, brittle fracture, caustic cracking Erosion, caustic cracking, brittle fracture, Cloverleafing None 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

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