EKG-Oct-20

Q1. With respect to properties of fuel oil, explain the significance of the following terms;

(a) Calculated Carbon Aromaticity Inbox (CCAI).
(b) Open flash point and Closed flash point.
(c) The importance of Sodium to Vanadium Ratio.
(d) Octane Number.

Q2. A. With reference to fatigue of engineering components;

A. Explain the influence of stress level at cyclical frequency on expected operating life.;
B. Explain the influence of material defects on the safe operating life of engineering component;
C. State the factors which influence the possibility of fatigue cracking of an auxiliary boiler feed water pump shaft and explain how the risk of such cracking can be minimized.

Q3. Sketch and describe the operation of four ram electro-hydraulic steering gear system. Indicate and explain the valve position for the operation of the system when one pump is isolated and unit is operating on two rams only.

Q4. As second engineer onboard a tanker, describe the procedure for presenting a Main Boiler for survey by a classification society.

Q5. Sketch a sealing arrangement for an oil lubricated stern tube. Identify the common forms of seal failure; State how oil loss due to seal failure can be restricted whilst on passage? What is the material used for sealing rings and propeller shaft liner?

Q6. Discuss the causes of corrosion and the means by which corrosion of the following may be limited by manufacturers and ship’s personnel respectively:

A. Internal and External surfaces of auxiliary steam lines;
B. External surfaces of auxiliary boilers;
C. Water boxes of seawater coolers and condensers;
D. Main seawater inlet pipes.

Q7. Describe with a sketch a pneumatic relay and show how feedback can be achieved when such a relay is used in conjunction with a flapper mechanism.

Q8. With reference to the operation of two-stage reciprocating air compressors explain the following: a. Advantages of Multistage compression. b. Significance of bumping clearance and adjustment thereof. c. Reasons for reduction of compressor capacity. d. Reasons and Effects of Second stage suction valve leakage.

Q9. With reference to oily water separators: - A. Describe with the aid of a sketch, the working of such a separator; B. Explain the consequence if the interface detector position is incorrect;.