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Q1. (a) Describe, with the aid of sketches, how the test pieces for a Class 1 pressure vessel are obtained. (6)

(b) List the tests which are carried out on the test pieces described in part (a). (4)

Q3. (a) Sketch an annotated block diagram of a closed loop control circuit. (5)

(b) Describe how the control loop sketched in Q(a) operates. (5)

Q3. with reference to oil filled stern tubes:

Describe, with the aid of a sketch, the principle of operation of a combination seal, which incorporates a wrapped bellows radial face seal and a lip seal.  (10)

Q4. With reference to microbacterial infestation:

(a) List the engine room systems that may be affected by this type of contamination. (2)

(b) Explain the conditions required for bacteria to evolve. (6)

(c) Describe how the presence of microbial contamination could be detected. (2)

Q5. With reference to centrifugal pumps and pumping systems:

a) Explain the principle of operation of a centrifugal pump. (4)

b) Define net positive suction head available (NPSHa). (2)

c) State the effects of temperature on NPSHa. (2)

d) Describe how the effects of temperature can be overcome. (2)

Q5. (a) Sketch a rotary vane steering and hydraulic circuit showing 2 x 50% units and the directional control valves. (6)

(b) Describe how the system in part (a) can still operate should an oil leak occur. (2)

(c) State the advantages of rotary vane compared to four ram steering gear.  (2)

Q7. With reference to ships air conditioning plants:

(a) State the temperatures and relative humidities at EACH of the points that are regarded as the boundaries of the comfort zone. (2)

(b) Explain how the temperatures and relative humidities could be maintained within the comfort zone when the ship is in EACH of the following locations:

(i) North West Europe in winter. (2)

(ii) Arabian Gulf in summer. (2)

(c) State with reasons FOUR locations within the accommodation that conditioned air must not be recirculated. (4)

Q8. As Chief Engineer Officer, describe the examinations that were carried out during a safety equipment survey with regard to fire safety. (10)