ENGINEERING KNOWLEDGE (STEAM)
Time allowed: 3.5 hours
Six (6) questions only to be attempted
(1) Discuss the advantages and disadvantages of using a two or three row velocity
compounded impulse wheel in a turbine.
(2) Describe how you would ascertain the mechanical clearance between the piston and the
cylinder cover and also between the piston and the bottom of the cylinder. Why are these
clearances important and what wear or adjustments to the engine would affect them?
Explain why the clearance at the bottom is greater than that at the top.
(3) Sketch and describe the gland steam arrangement for a turbine set. State which valves are
open and shut under any given circumstances?
(4) Explain how you would prepare a set of main steam turbines and its auxiliary equipment
for sea. Describe the warm up procedure and state the precautions to be taken before
turning the turbines by steam.
(5) What action would you take if, while steaming a water tube boiler, one of the tubes ruptured?
Describe how the tube may be plugged and the boiler put back into service.
(6) What is meant by 'priming' of a marine boiler? State the possible reasons for a boiler
priming. What serious damage to main and auxiliary machinery may be caused by a
boiler priming and what precautions are taken to avoid this damage?
(7) Describe a steam driven duplex water pump suitable for fire mains or general service.
State the materials of which the various parts are made and explain the action of the
steam valve gear.
(8) If all the fires in an oil-burning boiler suddenly went out, what causes would you look for and
what action would you take? What precautions would you take before lighting up the fires again?
(9) Why is it necessary to have an auxiliary feed arrangement incorporated with the main boiler
feed system of a steamship? Under what conditions is the auxiliary feed system used and
what procedure would you adopt to ensure it is always maintained in good condition?
..............
M❤K
M❤K
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