DieselShip's Online Content Library

Q1) With reference to electric arc welding:

(a) Draw a labelled sectional sketch of a satisfactory butt weld (8)

(b) Discuss the advantages and disadvantages of using alternating current and direct current in this type of welding (8)

Q8. (a) Sketch a two-ram type hydraulic steering gear with a single Electro-hydraulic pumping unit. Show the hunting gear arrangement and indicate valve positions (8)

(b) State the purpose of, and describe the operation of:

(i) Hydraulic shock/buffer valves (3)

(ii) Oil replenishing tank (2)

(iii) Hunting gear (3)

Q3) A controllable pitch propeller on a diesel driven vessel eliminates the need for: (16)

(a) Friction clutches

(b) Disconnect clutches

(c) Reversing gears

(d) Reduction gears

Justify your answer and explain the working of CPP in brief.

Q4) Describe with the aid of suitable graph, the discharge characteristics of a centrifugal pump. Explain why it does not require a relief valve (16)

Q5) With regard to a reciprocating refrigerator compressor.

(a) Sketch the mechanical shaft seal showing its component parts and how it is lubricated (8)

(b) Describe the sealing arrangement stating the materials used for the component parts (4)

(c) State the effect on the environment of the release of refrigerants into the atmosphere (4)

Q6) (a) Sketch an auxiliary boiler ‘blow down’ valve. Explain how it differs from its shipside counterpart (10)

(b) Describe the sequence of ‘blow down’ procedure (6)

Q7) Submit a report to the Chief Engineer stating how the freshwater generator output on board you ship was increased to near optimal values. The report should specifically mention the adjustments, corrections and improvements executed (16)

Q8. (a) Why is oil in boiler water considered dangerous? Where does it usually come from and how can it be removed? (8)

(b) Briefly describe why boiler water needs to be tested periodically and state two of the tests. (8)

Q9) Sketch and describe a contra flow type heat exchanger for the auxiliary engine applications. (16)