EX/MRN/T/325/112/10
BACHELOR OF M ARINE ENGG. EXAMINATION, 2010
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.
1. Your vessel is in Dry-dock.
(a) State the procedure adopted to remove the tail end
shaft.
8
(b) State the check/tests needs to be carried out on tail end
shaft during survey.
4
(c) Mention what special checks you will carry out on Propeller
key/keyway.
4
2. Ref. : Electro Hydraulic Steering Gear,
(a) Sketch a two ram type electro hydraulic steering gear fitted
in a vessel.
8
(b) Explain clearly that how the rudder angle moves
proportionately with respect to the movements of the hand
wheel located in the wheel house.
8
(Turn Over)
2
3
3. In relation to SEWAGE TREATMENT regulations,
(a) Explain what is e-colliform count ?
4
(b) Sketch & describe aerobic type sewage treatment plant
fitted on a vessel.
8
(c) What routine maintenance required before & after use
of the plant.
4
4. Classify marine pumps.
(a) Discuss the working principle of a positive displacement
pump & dynamic pressure pump.
8
(b) State that why a positive displacement pump must be
fitted with a built in relief valve ?
4
(c) State routine maintenance needs to be taken for
reciprocating & C.F. pumps.
4
5. Write short notes on :–
(a) Replenishing tank
(b) Gear pump
(c) Bye-pass valve
(d) Heleshaw pump
4x4
7. Explain the function of Gravity disc in respect of hydrostatic
equilibrium in a running purifier.
6
How a gravity disc is defined ?
2
Explain with valid various reasons for purifier overflow.
8
8. With reference to centrifugal purifier, give reasons for : 4x4
(a) Heating of oil before feeding to Purifier.
(b) Sliding bowl remains closed in spite of water/sludge pr.
on it.
(c) Vibration.
(d) Its limitation.
9. Why both Bridge Gauge and Dial deflection gauge reading
are required for checking crank shaft misalignment ?
6
Explain a procedure to check crank shaft vertical misalignment
by Dial deflection gauge.
10
10. Sketch and explain oil lubricated propeller shaft bearing
lubrication system.
8
How system L.O. contamination is prevented ?
4
What is propeller drop and how it is measured ?
4
Part - II
Answer any three questions.
––– x –––
(Neatness in handwritting and clarity in expression carry
weightage and Illustration of an answer with clear
sketch/diagrams carries weightage.)
6. What are the differences between Clarifier & Purifier ?
4
Sketch and explain how a centrifuge can be used as a clarifier
and purifier together ?
12