MEO CLASS IV exam is conducted by DG SHIPPING govt. of India. Below is the list of questions most frequently asked in meo class 4 MEP ( Marine engineering practice ) exam.

Precaution is taken to give all correct answers at the same time author is not responsible for any mistakes whatsoever.

These class 4 MEP questions and answers can be considered as a reference guide for your class 4 written exam.


Graphitization is the term used to describe:

a) Bimetallic corrosion of brass and bronze alloys leading to deposition of graphite
b) Selective phase corrosion of grey cast iron leading to corrosion of graphite flakes and leading to loss of strength *

c) Electroplating process in which graphite is deposited on the mild steel components to protect them against corrosion
d) Chemical reaction between pure graphite and iron so as to increase the graphite content of iron

Accelerated corrosion due to removal of protective surface films (e.g.) oxide layers on metal/alloy surfaces due to turbulence of working fluid is known as

a) Bimetallic corrosion
b) Impingement corrosion *

c) Cavitation erosion
d) Selective phase corrosion

An auxiliary engine turbo-charged makes strange noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you

(a) Continue to run the engine and wait for some time
(b) Stop the engine for a while and make some checks *

(c) Reduce the load of the engine
(d) Run it on steady load to make some checks.


During prolonged astern maneuvering of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi-choice)

A) Inform the bridge that no further maneuvering is possible as the turbine are likely to be damaged
B) Reduce the vacuum further to control the relative expansion *

C) Keep manoeuvring irrespective of damage to the turbines
D) Request the bridge to try to reduce number of astern movements *

Cold and viscous lubricating oil of an auxiliary engine is most likely to cause

A) Sudden stopping of the engine
B) Difficulty in starting the engine *

C) Rhythmic knocking sound from inside the engine
D) Drop in RPM of the engine

Viscosity of fuel oil used for ME was 145cst, new fuel comes whose viscosity was more than earlier, what should you do

a) increase temp setting
b) change setting of viscotherm
c) do nothing *

d) open steam valve manually more

Corrosion of mild steel can be affectively prevented by

a. cathodic protection *
b. protective coatings *
c. addition of suitable alloying elements *

d. applying adhesives

In a three phase electrical equipment, the immediate action in the event of fuse blowing in one of the phases would be

a. to replace with a fuse of correct rating
b. to replace fuses on all three phases *

c. to try to repair the fuse
d. to investigate the fault that led to blowing the fuse

A butterfly valve was found leaking and has to be overhauled. Which of the following is a correct statement?

A. There is no need to remove the valve from pipeline and it can be overhauled in place
B. Butterfly valves cannot be overhauled without removal from pipelines *

C. It is better idea to remove the valve from pipeline and then carry out the maintenance rather than do it in place
D. It will depends on the time available to you, whether you will remove valve from pipeline or overhaul in place

The lower half of main bearing of a very large diesel engine can be removed by:

A. Pulling out with a chain block
B. By hammering out with the help of a soft mallet
C. By slightly jacking the crankshaft and turning out the bearing half with a rope or similar tackle provided. *
D. By using a special tool in the oil hole and turning the shaft to turn out the lower half. *

Which of the following option gives you the correct sequence of the metals/alloys in decreasing order of preferential corrosion when all of them are bonded and immersed in an electrolyte? (mcq)

A. Stainless Steel, Naval Brass, Aluminium bronze , Copper
B. Aluminium Bronze, Cupro-Nickel, Monel metal , Titanium *
C. Stainless Steel, Cupro-Nickel ,Naval Brassl , Monel Metal
D. Stainless Steel, Copper, Naval Brass , Aluminium bronze *

After cleaning the M/E F.O. heater you have assembled the heater and want to try out the heater before putting into use. Which is the correct sequence of operation of the valves?

A. (1) Vent valve open (2) F.O. inlet valve crack open (3) When F.O. starts coming out of vent line close vent (4) F.O. inlet valve full open (5) F.O. outlet valve full open (6) Steam return and inlet valves slowly opened up *
B. (1) Vent valve open (2) F.O. outlet valve crack open (3) When F.O. starts coming out of vent line close vent (4) F.O. outlet valve full open 5) F.O. inlet valve full open (6) Steam valves slowly return and inlet opened up
C. (1) F.O. outlet valve crack open (2) F.O. inlet valve crack open (3) As the pressure gauge shows pressure open steam heating valves slowly (4) Fully open F.O. inlet and outlet valves
D. (1) Open steam return and inlet valves (2) Open F.O. outlet valve first slowly and F.O. inlet valve thereafter

Why is use of Polymer treatment restricted to low-pressure boilers?

A. It does not effectively control sludge formation.
B. It does not effectively control scale formation.
C. It has no PO4 present to counter caustic alkalinity *

D. All of the above

During stripping operation the discharge valve is kept throttled to maintain sufficient back pressure, why?

A. To avoid back flow of sea water into the ballast tank
B. If back pressure is not sufficient, the ballast water cannot be pumped out as the sea water head on the outside is more
C. To avoid pump losing suction due to loss of priming as the available suction head is very low *

D. To control the motor current which will otherwise be very high

During shutting down the purifier you find that purifier always vibrates heavily for some time and then becomes normal until it finally comes to a stop. What should be done to avoid this situation?

A. The purifier bowl should be cleaned before next startup
B. The brake should be applied so that the critical speed doesn’t last long *

C. Complete overhaul of the purifier should be carried out and the bearings need to be renewed
D. The bowl should be sent for balancing

During shutting down the purifier you find that purifier always vibrates heavily for some time and then becomes normal until it finally comes to a stop. What is wrong with purifier?

A. The purifier design is faulty
B. The purifier bowl has a heavy sludge deposit and requires cleaning
C. The purifier bowl is not balanced properly
D. During shutting down most of the purifiers pass through the critical speed zone *

SDNR valve is the term used for which of the following type of valves?

A. Standard Dimension Non-Rusting Valve
B. Screw Down Non-Return Valve *

C. Small Diameter Negative-Range Valve
D. Stainless Disc Non-Rusting Valve

The suction pressure gauge of the Engine room bilge pump is broken and you dont have a spare. Chief Engineer has asked you to troubleshoot the problem with Bilge pump not taking suction from Fwd.(P) bilge well. You try taking suction from Fwd. (S) & Aft Bilge well and find that pump is taking good suction. Thereafter you try suction from Fwd.
(P) bilge well for sometime after priming with Sea Water but there is no change in level. You inspect the suction filter of the pump and find that it is very difficult to remove the same, you had to apply too much of force to lift the filter cover while normally it comes out easily. What does it indicate?

A. It does not indicate anything, sometimes the filter covers are difficult to remove.
B. It indicates that the suction valve of the Fwd. Bilge Pump is leaking
C. It indicates that the suction filter of the Fwd. (P) bilge well is clogged completely *
D. Pump suction filter might be clogged

Steel is an alloy of Iron, carbon and alloying elements. The carbon content of steel is:

A. Less than 1%
B. Less than 2% *

C. More than 2%
D. Any percentage of carbon

The seating material for perfectly sealing type Ball valves is usually made up of

A. Rubber
B. PTFE or Nylon *

C. Rubber reinforced with steel wire
D. Stainless steel

The main disadvantage of a centrifugal pump is that:

A. They are only available in high capacities
B. They are difficult to maintain
C. They are not self priming in nature *

D. They are extremely expensive pumps

The advantage of a reciprocating bilge pump over centrifugal pumps is that:

A. They do not have any advantage over a centrifugal pump
B. They have greater capacity to weight ratio
C. They give a smoother discharge if used in conjunction with an accumulator
D. They are self priming in nature *


With Reference to the centrifugal pump characteristic curves, what will be the effect when Pump is started a) with Suction valve shut b) with Discharge valve shut

A. With Suction valve shut Both Head (H) & Flow rate (Q) will be Zero and with Discharge Valve shut Flow rate (Q) will be Zero & Head (H) will be at Maximum height *
B. With Suction valve shut Head (H) will be Zero & Flow rate (Q) will be minimum and with Discharge Valve shut Flow rate (Q) will be Zero & Head(H) will at Minimum height.
C. With Suction valve shut Both Head (H) & Flow rate (Q) will be Zero and with Discharge Valve shut Flow rate (Q) will be Minimum & Head (H) will be at Minimum height
D. None of the above.
E. All of the above.

If 3 Centrifugal pumps are running in parallel and the backpressure is substantially increased, what effect will be observed on the pumps in use.

A. Flow rate will reduce
B. Increase in the pump casing temperature.
C. Safety alarms and trips (high casing Temperature) will activate, if no corrective action taken
D. None of the above. E. All of the above. *

For shaft sealing of a main sea water pump for ship plying in coastal muddy waters, which is the best option

A. Gland packing *
B. Lip seal with garter spring
C. Mechanical seal
D. Cup seal

The best way to clean the compressor impeller of an auxiliary engine turbocharger would be:

A. By soaking it overnight in a strong chemical solution like carbon remover or air cooler cleaning chemical. *
B. By chipping the dirt off the impeller blades
C. By using a pneumatic wire brush
D. By soaking in warm water and then cleaning it gently by rags.

Following conditions are given:

1) cargo tank has cargo A having specific gravity of 0.70, while #2 Cargo tanks has cargo B having specific gravity 1.05
2) #1 cargo pump is taking suction from # 1 Cargo tank, while # 2 Cargo pump is taking suction from # 2 cargo tank and both are pumping ashore to two identical storage tanks ashore
3) # 1 & # 2 Cargo tanks both are identical and both have same sounding during starting; # 1 & # 2 pumps are identical and placed in Pumproom
4) Discharge manifold and shore pipelines for both the cargoes are identical ones and discharge valve for both pumps are fully open.

What will be the reading of discharge pressures of both the cargo pumps?

A. # 1 Pump discharge pressure will be higher than # 2 pump discharge pressure
B. # 2 Pump discharge pressure will be higher than # 1 pump discharge pressure. *

C. Both pump discharge pressures will be same as both are pumping through identical pipelines to identical tanks ashore
D. Cannot say anything as discharge pressure will be affected by various other factors

Excessive lubrication in compressors can lead to:

A. Sticking of valves *
B. Carryover and deposit of oil particles in pipelines and reservoirs *

C. Decompression
D. Detonation

Which of the following valve types is available with non-return arrangement?

A. Gate Valve
B. Globe Valve *

C. Ball Valve
D. Butterfly Valve

Types of tubes in refer cooler

A. Straight tube
B. U tube
C. Coil tube
D. Spring tube *

M/E FO heater steam control v/v send to on viscosity control mode, when u start using FO different viscosity

A. Change setting viscosity index
B. Temperature controller
C. No change in viscosity and viscosity will automatically controlled *

D. We have to change the mode manually

Provide in protection against mild steel galvanic corrosion

a. Copper
b. Aluminum *

c. Stainless steel
d. None of the above

Less vacuum in centrifugal p/p

a. Leak of discharge v/v
b. Loss of gland packing *

c. Loss of fluid in suction tank
d. Long suction p/p

Type of corrosion in fresh water of D/E

a. Stress
b. Hot corrosion
c. Bimetallic corrosion
d. Selective phase corrosion *

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