Types of tubes in refer cooler

After maintaining correct discharge pressure, soon ceases to discharge water what are possible cause?

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?

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?

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

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

The machinery which is usually tested first once the ship reaches a dry dock is

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)

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

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

The main disadvantage of a centrifugal pump is that:

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

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

Increasing the rotational speed of a cargo pump the pump flow rate will:

Graphitization is the term used to describe:

Which of the following valves are designed to have valve seat in pairs - one facing the inlet side and the other facing the outlet side within the valve body?

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

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

In Impressed Current Cathodic protection system, the current for cathodic protection is supplied by:

The common term used for failure of metal and alloys in a corrosive environment, when subject to high stresses is known as:

A recently completely overhauled Engine room bilge pump was working efficiently. Suddenly one day you find that the pump is not taking suction. You have tried priming with sea water but still the pump doesn’t take suction from any of the bilge wells or bilge tank. What could have gone wrong inside the pump? Choose the best alternative.

Less vacuum in centrifugal p/p

Surface preparation of steel surfaces, prior carrying out painting is important because

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

Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?

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

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

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

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)

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

Cadmium coatings provide corrosion protection. Cadmium coatings are commercially carried out using which of the following methods:-

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

Wheel operated butterfly valves are operated through a reduction gearbox. The Gear arrangement inside of gear box is of _________ type

Corrosion of mild steel can be affectively prevented by

Type of corrosion in fresh water of D/E

Chromium is a nobler metal when compared to that of steel. In some marine applications Chromium is electroplated to the steel surfaces. Why?

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

Excessive lubrication in compressors can lead to:

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

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?

The flow rate through a F.O. transfer pump will not be affected by which of the following factors?

In a Sea Water cooled J.C.W. cooler, the most common cause for loss in cooling efficiency of the heater is:

Which of the following can lead to short cycling or frequent cutting in and cutting out of a fridge compressor?

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?

Provide in protection against mild steel galvanic corrosion

Cladding is the process used for:-

Correct method of greasing a centrifugal pump bearing is:

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

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

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

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