DieselShip's Online Content Library

Q1. (a) How does fouling affect the performance of a heat exchanger? (4)

(b) Describe the types of plugs used to plug the ends of a leaky heat exchanger tubes. (6)

(c) What is a differential pressure gauge? Where is it used? (6)

Q2. (a) Why are centrifugal pumps used for the sea and cooling water services with marine diesel engines? What are their drawbacks? (6)

(b) What do you understand by the term 'pump characteristics'? (6)

(c) What is net positive suction head? (4)

Q3. (a) With a sketch of the fuel line diagram explain the bunkering process and the checks to be undertaken before bunkering, during and after completion of the bunkering operation. (10)

(b) What are the safety features of the fuel line? (6)

Q4. (a) Explain the function of an 'eductor' with the aid of a sketch. Where do you find an eductor system on a ship? Give two examples. (8)

(b) Explain the working principle of an eductor. What are the operational challenges that may affect the performance of the eductor? (8)

Q5. (a) How is the tensile strength of a metal determined? What other information is obtained when a tensile test is made? (8)

(b) Name the non-destructive tests used during the manufacture and service of a diesel engine components and associated equipments. Give an example of where each test is used. (8)

Q6. Write short notes to explain the following fittings/devices used in engine room, and their applications: (16)

(a) Gate valve

(b) Butterfly valve

(c) Quick Closing valve

(d) Valve actuators

Q7. Sketch and describe how the torque is transmitted to the rudder stock in a rotary vane steering gear. (16)

Q8. (a) Why is oil in boiler water considered dangerous? Where does it usually come from and how can it be removed? (8)

(b) Briefly describe why boiler water needs to be tested periodically and state two of the tests. (8)

Q9. Explain any four of the following:

(a) Difference between crude oil washing and tank cleaning (4)

(b) Dynamic positioning system and its types (4)

(c) Deaeration tank in the HT Jacket Cooling Water System (4)

(d) Thermostatic expansion valve (4)

(e) Proportional controller with examples (4)