Monday, 5 July 2021

Motor Mep question with answer

 Reefer system switchover complete process from one system to standby system?

Ans. 

Switch to manual.

Collect all ref. in condenser/receiver by closing it's outlet.

*Open the sea water inlet/outlet of cooling line of standby condenser 

Open the outlet of Condenser/Receiver of standby and run it by stopping the running system

*Shut the sea water outlet/inlet of the switched of condenser.



What is cpr? 

Control pressure relief ring top most ring in 2 stroke which have small holes to release exhaust gases so that Compression ring make proper sealing with help of gas forces





Four factors determine the lubricating oil feed rate:


- sulphur content in the fuel oil

- alkali content in the cylinder lube oil

- engine history

- engine load.


Alpha Lubricator or ME Lube operating in ACC-mode


(Adaptive Cylinder oil Control) adapts the lubricating oil feed

rate to the fuel oil sulphur content and the engine load.


ACC factor will depend upon residual BN , high or low top landand iron wear rate


acc factor multiplied by sulphur % = feed rate



How steam pressure is maintained in sea?

By dump the steam , we have controller 


By increasing or decreasing the load ...by maintaining air fuel ratio 


By opening steam to the tanks so that excess steam can be used











Evaporator coil leak repair

 Evaporator coil repair



Pipe Repair Clamps


Pipe repair clamps have provided a popular solution for fixing copper pipe in the home for many years now. Repair clamps are metal sleeves lined inside with rubber. To use a pipe repair clamp, you place the clamp on the area of pipework requiring repair so that the rubber is directly over the hole.


You then tighten the screws on the clamp and it will slowly seal itself around the pipe, compressing the rubber into the leaking hole. When applying the clamp, you must be careful not to overtighten it. Otherwise, you may end up bending the copper pipe out of shape and causing more damage than you started with.


Pipe repair clamps are popular because they are both easy to apply and reusable. Once the damaged area of pipework has been replaced or been treated to a more permanent solution, then you can keep the clamp in question and use it again for any future leaks.


Epoxy Putty


Epoxy putties are made up of two components. When mixed, they form a material which can be used as an adhesive or to plug holes before it sets into a hardened material. That makes epoxy putty perfect for sealing leaks or filling cracks in copper pipe.


The ease with which epoxy putties can be used and the speed with which they work is their most attractive feature when it comes to fixing a copper pipe. With a fast-working putty, you can hand knead Part A and Part B together within minutes.


You then push the epoxy putty into the pipe, plugging the hole or crack. It will set hard within 10 minutes and water flow through the pipe can be turned back on within an hour.


One important factor to consider when it comes to using epoxy putty to repair a copper pipe is that some putties can contain harsh chemicals.


If the pipe you are fixing is one that supplies water that could be consumed, you should always check to ensure that the epoxy putty product you are using is WRAS approved, meaning it has been certified for use with drinking water.


Pipe Leak Tape


There are many different variations of pipe repair tape on the market, all with different levels of effectiveness. Plumber’s tape will often be the cheapest and can provide a temporary repair until a plumber can look at the issue.


Plumber’s tape is water-resistant, hence the name. To apply, you simply wrap it around the area of pipework requiring repair and it will help to seal the leak. It won’t withstand much pressure however, which is why it is only suitable as a short-term solution.


If you’re after a more permanent solution, then there are more advanced self-fusing pipe repair tapes on the market. These are made from materials such as silicone and other advanced polymers, which will fuse into a solid rubber band over the leak when wrapped around the pipe.


Such self-fusing pipe leak tapes can often withstand large amounts of pressure, far more than you’d find in the average domestic copper pipe. This means that they can provide a longer-lasting repair.


The one negative when it comes to Pipe Leak Tape is that it does require a large working area with enough clearance around the pipe for wrapping to take place.


If you’re trying to repair a copper pipe in a confined space or up against a wall, then you won’t be able to wrap effectively around the problem area – especially when using self-fusing tapes which require maximum stretch to exert maximum pressure over the leak. If that’s the case, then another repair method is required


Soldering


We find that many people are put off using soldering as a technique for repairing holes in copper pipe because they don’t have the confidence to attempt it. There’s also something about the word soldering which makes it sound much more complicated than it is.


To solder a copper pipe, the first thing you have to do is shut off the main water valve. You then need to drain the pipe in question from a point below where the hole is, tilting the pipe if possible so that any water sitting within is drained out.

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