EKG-Oct-21

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

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

Q2. Describe how you, as a Second Engineer, would prepare an auxiliary boiler for survey by a classification society.

Q3. 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?

Q4. (a) Discuss the principle, different methodologies, advantages, limitations & applications of Ultrasonic testing. (b) Explain how Magnetic Particle Testing (MPT) is carried out in different ways? State its advantages, limitations, and applications

Q5. 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.

Q6.With regard to the refrigeration system explains; 

A. What are the possible reasons for HP cut out in the refrigeration system? 

B. What are the indications if the air is present in the refrigerant system and how to remove air from the refrigeration system? 

C. How unloader works in the refrigeration system? 

D. What are the possible reasons for Icing on the evaporation coil? 

E. Why is a compound gauge fitted in the refrigeration system?

Q7. A. Sketch a line diagram showing the layout components of a hydraulic system with a variable delivery, Pressure compensated pump, and accumulator, suitable for the operation of deck machinery. B. Describe the operation of the system sketched in (a).

Q8. A. Reverse osmosis is one of the alternatives for shipboard production of drinking water. sketch a simple diagram and describe the principle of reverse osmosis. B. Sketch a line diagram showing a single pass system for producing fresh water from seawater and Describe such a system.

Q9. A. Explain Creep; Brinelling; Fretting; Fretting corrosion; B. State, with reasons, where these may occur in the ship propulsion System.