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.


You have seen and operated several valves onboard ships. All the butterfly valve operation handles are operated by a locking arrangement because:

A. Butterfly valves do not used gland packings and thus spindle doesn’t have
anything to keep it in position and can open by vibration
B. Butterfly valve does have a spindle packing but same cannot be excessively tightened to have good grip on the spindle to prevent it from opening against vibration
C. Butterfly valves can move by vibration but that is not the main consideration, the main consideration being opening/closing against liquid pressure *
D. All the butterfly valves do not have locking arrangement as there is no such requirement for the same

Which of the group of method are used for priming of centrifugal pumps onboard ships?

A. Gravity tank, attached vacuum pump
B. Attached Vacuum pump, filling pump casing using a fresh water hose
C. Central priming system, attached vacuum pump, sea water priming *
D. None of the above

Which one of the following is a type of corrosion:-

A. Electroplating
B. Galvanisation
C. Graphitisation *
D. Demulsification

The size of solid particle contaminants in hydraulic systems is measured in:

A. Millimeter cubed
B. Nano-millimeter
C. Microns *
D. Micro millimeter

Pump Start but Motor gets overloaded or Trip on overload.

A. Alignment is wrong *
B. Gland packing too tight *
C. Worn out / Damaged ball bearing *
D. Cavitations exists
E. All of the above

Which of the following instruments measures propeller drop?

A. Poker Gauge *
B. Telescopic feeler gauge
C. Trammel
D. Propeller drop gauge


Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil:-

A. Increasing cylinder oil feed rate *
B. Using high TBN cylinder oil *
C. Increasing scavenge air temperature
D. Decreasing cylinder oil feed rate

Your ship has an OWS and reciprocating bilge pump of capacity 2.0 m3 /hr. It takes about 12 hours to pump out the complete bilge tank through OWS. The ship is going to dry-dock and Chief Engineer is recommending company to install a centrifugal pump of 10 m3 capacity which will take the same space and can pump out the bilge tank only in 2.5 hrs. The company should:

A. Accept the proposal as a centrifugal pump has several advantages over a reciprocating pump
B. There is no question of accepting a centrifugal pump as a Engine room bilge pump
C. Propose to fix a Gear pump instead of a centrifugal pump
D. Pipelines and pumps once designed cannot be changed as they are class approved *

Normally so called ‘single screw pumps’ are used as sludge pumps in engine room. What is the correct technical name of these pumps?
A. Snake Pump
B. Screw Pump
C. Progressive cavity pump *
D. Gear rotor Pump

In a Parallel-Gate type valve the sealing between the valve and the disc is provided by:
A. Appropriate tightening torque of the valve spindle
B. Gate and valve seat have a taper and when tightened they will seal against each other *
C. Either the seat or the disc Gate are free-floating, allowing upstream pressure to seal the seat and disc against any unwanted leakage
D. For a gate type valve the sealing is never perfect and they always allow some leakage

The crank web deflection readings of a diesel engine would be erroneous in which of the following conditions?

A. When the draught of the vessel has changed while readings were being taken * B. When cargo loading and discharging has been too rapid *
C. When the crankcase temperature has changed substantially during the process of taking the readings
D. None of the above

The purpose of an evaporator in the domestic refrigeration system is to
A. Transmit latent heat of evaporation
B. Absorb latent heat of fusion
C. Absorb latent heat of evaporation *
D. Transmit latent heat of fusion

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Centrifugal pump will typically give you a low flow rate at a lower pressure, where a piston pump will give you more pressure and higher flow rate. Is the statement correct?

C. First Sentence is right. Second one is wrong
D. I Don’t know

Which of the following is an important requirement for proper functioning of sacrificial anode system:-

A. Good Insulation between anodes and ship’s hull
B. Good electrical continuity between anodes and ship’s hull *
C. Providing protection of anodes from being painted over during hull painting
D. Presence of an insulating material between anode and the cathode

The main disadvantages of a reciprocating pump over a Gear pump is that:

A. A gear pump is self priming while a reciprocating pump is not
B. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed
C. The discharge of reciprocating pump is pulsating and discharge rate is lesser *
D. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used

Which of the following types of damages are metal seatings of a valve subject to? Choose the correct alternative.

A. Corrosion, Erosion, Abrasion, Deformation *
B. Corrosion, Fatigue failure, brittle fracture, caustic cracking
C. Erosion, caustic cracking, brittle fracture, Cloverleafing
D. None of the above

It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the most probable cause?

A. There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge pump
B. The Fwd. (P) bilge well suction valve might be leaking
C. The Fwd. (P) bilge well suction filter cover gasket might be leaking *
D. The pump needs to be overhauled

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You are pumping out sludge to a shore facility using your sludge pump. You find that the discharge rate of pump is very slow and suction filter is getting clogged frequently. What is the best alternative to counteract the problem?

A. Remove the pump suction filter and pump out the tank
B. Increase the tank temperature, keep an eye on the pump suction pressure and clean the filter as soon as it drops *
C. As soon as the as the shore facility tells you that they are not receiving any sludge, you stop the pump and clean the filter
D. Fabricate a bigger mesh size suction filter and use in place of normal filter so that frequency of filter blockage is reduced and you can get a better discharge rate

When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power will

A. increase *
B. decrease
C. Will not be affected as the pump power depends only on the flow capacity
D. None of the above

The process of depositing zinc on steel surfaces by diffusion coating is known as

A. Sherardising *
B. Chromising
C. Calorising
D. Galvanising

By which of the following is the attached vacuum pump of a ballast pump is driven?

A. Electrical motor
B. Hydraulic motor
C. Pump driven clutch *
D. Pneumatically driven


High tensile steels are:

A. High carbon steels with suitably added alloying elements B. Medium carbon steels with suitably added alloying elements C. Low carbon steels with suitably added alloying elements *
D. None of the above

A drain cooler is provided with S.W. cooling. What is the best way to increase the temperature of condensate draining to the hotwell?

A. Throttle the S.W. inlet valve
B. Throttle the S.W. outlet valve
C. Open the condensate Bypass to the cooler *
D. Close the condensate bypass to the cooler

After cleaning the sea chest filter you have placed the filter in the body and tightened the cover. Which one of the following is the best alternative?

A. You can open the filter inlet and outlet valves & directly start using the filter
B. If you do not want to use the sea chest in question, you need not worry and you can open the valves when required
C. Sea Water inlet valve should be crack opened, the filter body should be purged, any leakages and thereafter filter can be kept isolated or used as required *
D. You will close the other side sea chest valves first and then open this side sea chest filter inlet and outlet valves

You must have used reinforced rubber joints. The reinforcement is normally provided using non-asbestos fibres. The reinforcement is provided because

A. Ordinary rubber gasket have a porous matrix, having capillaries which can allow liquid leakage when subjected to high pressure
B. To increase the load carrying capacity of joint so it can withstand higher pressures *
C. To increase the temperature resistance of the joint *

D. To protect the joints from fire or other accidental damage

Corrosion protection of steel surfaces by zinc coating can be carried out only at temperatures below 65 Deg. C. For higher temperatures:

A. Zinc reacts very fast and thus can only provide protection for a limited time
B. Zinc reacts with steel and protective layer vanishes due to chemical reaction C. Steel may corrode preferentially to the zinc *
D. Dezincification occurs leading to removal of zinc coating

Which of the following valves cannot prevent backflow of liquid in a pipeline?

A. Gate valve *
B. Globe Check Valve
C. Swing Check Valve D. Angle check valve

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Most steam traps respond well to cleaning. But when a thermodynamic trap fails to operate after cleaning, the next course of action should be:

A. Throttle the steam outlet valve
B. Renew the trap
C. Lap the disc and the seat of the trap *
D. Throttle the steam inlet valve

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

A. Titanium, Mild Steel , Zinc , Stainless steel
B. Titanium , Stainless steel ,Mild Steel ,Zinc C. Zinc, Mild Steel, Stainless steel, Titanium *
D. Zinc , Titanium , Mild Steel , Stainless steel

Bronze is an alloy typically consisting of:

A. Copper , lead & tin
B. Copper , Zinc & lead
C. Copper , Zinc & Tin D. Copper , Tin & Lead *

In a positive displacement reciprocating pump, the use of the accumulator is to?

A. Steady the flow in the discharge section of the pipe.
B. Dampen the pressure surge on discharge side.
C. To always maintain a discharge head on the pump. D. Both options A & B *

The process of depositing chromium on to steel surfaces by diffusion coating is known as:

A. Galvanising B. Chromising *
C. Calorising
D. Coppering

When running TWO centrifugal Pumps in parallel, Flow rate “Q” is increased.

B. False
C. May Be
D. I Don’t know

A refrigerant compressor will run continuously when there is

A. Too heavy cooling load on the system *
B. Air in the system
C. Insufficient refrigerant in the system *
D. Any of the above

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You have started pumping out a Fore peak tank. The ballast pump is running showing a low discharge pressure but a positive suction pressure, Chief Engineer asks you to throttle the discharge valve to increase the back pressure on the pump. Why do you require to do the same?

A. The pump???s discharge rate needs to be controlled as it is pumping at a higher than rated capacity
B. Chief Engineer wants you to slow down as the deballasting is going on too fast and will finish sooner than expected
C. It is a misconception that pumps operate smoothly at increased backpressure and throttling of the discharge valve is a wrong practice
D. Centrifugal pumps cannot operate at greater than rated capacity, so throttling the discharge valve is only going to decrease the discharge rate below rated capacity *

Hopefully, you like our guide on MEO CLASS IV MEP QUESTIONS AND ANSWERS 1.0 In case of any query feel free to comment below.

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