5. If a fire broke out in the engine room, explain the following:
a. How can the fuel supply be shut off?
b. How can the supply of air be shut off?
c. How can the fire be dealt with from outside the engine room? Give a summary of all the facilities available for this purpose.
Class 3
1. Sketch a cross-section though a portable fire extinguisher suitable for use on oil fires. Identify the components.
2. State the component parts and associated equipment of a bellows type breathing apparatus.
3. Sketch and describe a smoke detector of the type fitted in an engine room. How is it tested?
Test examples 9
Class 1
1. Describe with a line diagram a hydrophore system, that is, a fresh water system incorporating an air reservoir.
Describe how a drop in pressure actuates the fresh water pump.
State two advantages of this system over the gravity head system.
2. Sketch a tubular oil cooler and explain the following:
a. How is differential expansion between the tubes and shell accommodated?
b. How is corrosion controlled?
c. How is automatic control of the oil temperatures effected?
State how by construction, operation and maintenance tube failure can be minimised
3. Give a simple explanation of the nature and effect of cavitation in rotodynamic pumps.
Describe with sketches a super-cavitating pump. State the purpose of such a pump and give an instance of current shipboard application.