Ex/MRN/T/325/144/2011
BACHELOR OF MARINE ENGINEERING EXAMINATION, 2011
( 6th Semester )
MARINE AUXILIARY MACHINES - II
Time : Three hours
Full Marks : 100
( 50 marks for each Part )
Use a separate Answer-Script for each Part
PART - I
Answer any three questions.
Two marks reserved for neatness.
Ref. : Electro Hydraulic Steering Gear,
1.
a) Sketch & describe a four ram type electro hydraulic steering
gear fitted in a vessel.
10
b) Explain the operation of the hunting gear.
04
c) Mention the effect of air in the system.
02
As regard Annex – IV of Marine pollution regulations,
2.
a) Explain how pathogenic pollutants causes biological
unbalance in the oceanic waters.
04
b) Sketch & describe aerobic type sewage treatment plant
fitted on a vessel.
08
c) What routine maintenances are required to run the plant ?
04
[ Turn over
[2]
[3]
Related to marine pumps.
3.
PART - II
Answer any three questions.
a) Sketch & describe a Gear pump. Why it is fitted with a built
in relief valve ?
08
b) State the operating principal of a positive displacement
pump.
02
Neatness in handwriting and clarity in expression carry weightage.
Illustration of an answer with clear sketch/diagrams carries weightage.
6.
contamination ? Name at least four contaminants and their
c) Write short notes on : Impeller, Volute Casing, Shaft seal.
effects on running engine.
06
7.
During your vessles stay is in Dry-dock.
4.
a)
during survey.
04
reading ?
8.
04
b) State how you would prepare the tank for internal survey.
to rectify the fault.
9.
c) State precautions needs to be taken prior entering the tank.
Use of Centrifuge against gravity separation.
ii) Desludging operation is not taking place on running purifier.
04
8+8
d) State how you would replace the heating steam coil fitted
04
6+10
With reference to the oil purification give reasons for –
i)
04
inside the tank.
How purifier drive power is transmitted from electric motor to
the rated rpm then what would be the possible reasons and how
04
a) Draw a settling tank with all fittings provided in it.
6+6+6
the vertical Shaft ? If the vertical shaft rpm does not attend to
c) State the importance of Stern Tube Lub. Oil Gravity Tank.
5.
Explain why shafting alignment is essentially required with ship
deflection. What information can be obtained from deflection
08
b) State the check/tests needs to be carried out on tail end shaft
6+10
structure. Explain how to measure the main engine crank shaft
What all routine maintenance you would like to carry out on
ship side valves ?
What are the various sources of Aux. Engine crank case oil
5.
Explain the procedure for fitting stern tube on a ship’s full. 16