asked in the Class 4B exam of MMD exam. This is the part 1 of series
dealing with the Marine engineering practice. Answer to these questions will
be available shortly. It is very important to have a look of the
questions that are asked in the previous year’s exam papers. If you have any
suggestions related to these questions, please write in the comment box below
Marine engineering practice subject papers for Class 4B MMD exam
bilge suction is frozen stuck in open position. State a written procedure to
the support staff how you would go about overhauling it, and then test its
coupling of a vertical mounted F.W. pump is worn out and you have no spares.
Suggest some alternative measures giving appropriate sketches of making the
pump work, so that you can make portwith such an emergency arrangement.
used in laminates made of fibre reinforced plastic? What tests are generally
carried out on such laminates?
on the following:
welding (d) Soldering
auxilliary engine crankpin bearing keeps getting scored every time it is opened
up for overhauling possibly because of one or all of the following:
is suspected to be leaking. Suggest some methods of identifying the leaky tubes
and measures to rectify these at sea, without resorting to tube renewal.
compressor has its bursting disc on the intercooler regularly blowing off. If
there were no more spares on board, what emergency measures would you suggest
to keep the air compressor working?
welding in the engine room of a tanker, in case of an emergency, what specific
precautions you would take if the:
loaded with crude oil.
loaded with vegetable oil
loaded with kerosene
shaft for a small gear pump is broken in the middle. Suggest some emergency
repairs to the shaft to enable run the pump. State what form of repair and how
you would carry out the repair? What is the most viable alternative to repair
if no spares are available?
cables of 440V, 50A capacity are to be joined. Suggest some cable types and
joining methods which are considered safe reliable and most efficient.
A non-return globe valve spindle is frozen in place and
in jammed shut position. Suggest a step by step procedure of freeing the
spindle and making the valve operational.
The cylinder head tightening nuts of a particular unit
on a large two stroke marine diesel engine cylinder head are to be opened.
Suggest a procedure for slackening the nuts with special emphasis on markings,
torque on spanner, opening procedure etc.
Sketch and describe any two types of welding joints
used for joining ship side hull plates. State the types of electrodes used.
Write short notes on the methods of arresting a pinhole
leak on a
pressure freon line
What is a function of the wearing rings used in most
erosion of high velocity discharge stream.
pump shaft against entry of air.
the discharge side from the suction side.
the turbulent discharge flow.
A reciprocating air compressor as an example is running
roughly and vibrating excessively, possibly indicating that the foundation
bolts are loose. How would each of the following conditions be indicated in
specific cases where the……..
are too tight
Increasing the moisture content of conditioned air is
known as humidification. How is de humidification achieved? Suggest some
humidity values in the comfort zone.
What would be the indications and the effects of a
compressor running under the following conditions
operating hours without carrying out preventive maintenance,
with an air filter element different from that required by the original
compressor running hot.
discharge pressure causing relief valves to blow.
A grease lubricated ball bearing or roller bearing will
run cooler if the grease _____________.
only 10% of all void spaces within the bearing
a high grease penetration number
thinned with a suitable lubricating oil
heated prior to packing the bearing
gasket and the broken studs have been replaced on a tank manhole cover. Which
of the following methods is satisfactory for testing the repair?
the tank with 0.5 kg/cm2 air, soap the repaired area, watch for
visible signs of leakage or bubbles.
the tank with water via the ballast pump until the ullage reading corresponds
to the maximum depth of the tank.
test the repaired area with a minimum of 7 kg/cm2 water pressure.
the tank via the ballast pump until water flows from the vent line opening on