DieselShip's Online Content Library

Q1. (a) Using a diagrammatic sketch, describe a good welded joint. (4)

(b) By diagrammatic sketches describe defects in welded joint and the causes

(i) Porosity (2)

(ii) Inclusions (2)

(iii) Undercut (2)

(iv) Lack of fusion (2)

(v) Crack (2)

(vi) Distortion (2)

Q6. (a) How is a 2-stroke engine started? Describe the sequence of engine starting. (5)

(b) Draw the Timing Diagram of engine starting, showing crank position of each Step. (6)

(c) What is OVERLAP in engine starting? (5)

Q1. Write short notes on the following pertaining to the use of copper alloys in seawater systems.

a. Use of copper nickel and formation of protective film for use in seawater. (4)

b. Cavitation. (4)

c. Dezincification. (4)

d. Marine biofouling. (4)

Q2. Draw and explain the shape of the characteristic curve of a p-n junction diode in forward and reverse bias modes (16)

Q4. Describe following terms with respect to Diesel Engine with suitable diagram.

a) Piston Stroke (4)

b) Swept Volume (4)

c) Clearance volume (4)

d) Compression ratio. (4)

Q7. State why the following equipment’s require shut down during a major fire which has necessitated the evacuation of the machinery spaces:

(a) Settling and service tank valves. (4)

(b) Fuel transfer and supply pumps (4)

(c) Mechanical and natural ventilation (4)

(d) State how the fire is brought under control using the facilities available outside the machinery spaces. (8)

Q6. a) What is the principle of gas cutting? (4)

b) Describe how gas cutting is carried out with Oxygen and Acetylene flame? (8)

c) State the pressure levels for Acetylene & Oxy cylinders for gas cutting operations. (4)

Q2. i) Explain the purpose and applications of using lubricating oils on board. (8)

ii) Name the types of lubricating oil used on ships and mention various properties of same and their significance. (8)

Q3. (a) Draw a simple sketch of cylinder head of 2-stroke main engine, describing function of cylinder head (6)

(b) Name the mountings on the cylinder head and their functions (6)

(c) Name the material of cylinder head, giving reasons (4)

Q3. i) What is meant by the term 'corrosion' and how does it occur in nature?  (6)

ii) Name different types of 'wet and dry corrosion' (at least 4 of them) with brief account of their occurrence and suitable preventive measures for their control. (10)

Q8. (a) Sketch a simple line diagram showing a shipboard oily water separator in series with a coalescing second stage. (10)

(b) Briefly describe the above arrangement and its operations also state the allowable oil content in p. p. m. of the discharge effluent from such an arrangement. (10)

Q2. Describe the following non-destructive testing methods:

a) Radiographic Inspection, principle, method in detail. (8)

b) Ultrasonic Inspection, principle, method in detail. (8)

Q4. (a) Describe the regular maintenance routine of the steering gear of a ship. (8)

(b) Describe with suitable diagram, how steering pump filters are cleaned. (8)

Q4. (a) Draw simple sketch of a crank shaft, with names of the different parts of the crank shaft (8)

(b) Describe function on crankshaft of 2-stroke diesel engine (4)

(c) Describe fittings on crank shaft for various operation of main engine (4)

Q1. (a) What is meant by the term 'purification' and what does it 'separate'? (3)

(b) What are the basic methods of 'separation'? Explain the functioning of ‘purifier' and 'clarifier'? (3)

(c) What is meant by the term 'interface' and what is the role of 'gravity disc' in determining the same? (4)

(d) What is 'NOMOGRAM' and how is the correct 'gravity disc' size selected? (6)

Q5. (a) What is the role of Windlass in the safe operation of Ship? (6)

(b) Explain the following terms used in respect of windlass operation. (10)

(i) Cable lifter

(ii) Brake shoe

(iii) Warp end drum

(iv) Dog clutch

(v) Slipping clutch

Q5. (a) Describe how air in the refrigeration plant is purged out (6)

(b) Describe how lube oil is added in the refer compressor (5)

(c) Describe how the lube oil filter of a reefer compressor is cleaned (5)

Q3. a) Explain, why is it important to measure bearing clearance in a diesel engine. (4)

b) What is Bridge gauge? How is the Bridge gauge used? Explain with a diagram. (6)

c) What are other recommended methods for checking bearing clearances. (6)

Q6. (a) Draw a diagrammatic sketch of auxiliary boiler on your ship, labelling all the mountings provided (8)

(b) Describe function of each mounting in brief (8)

Q2. (a) Draw a simple line sketch of a 'shell and tube' cooler, clearly labelling its parts. (6)

(b) Describe the system. (4)

(c) Name common defects found. (3)

(d) What periodical maintenance needs to be carried out. (3)

Q8. a) Describe the working of a Mechanical Shaft seal with a diagram. How working fluid leak is prevented? (8)

b) What are causes of Mechanical shaft seal failure? (4)

c) Describe for Mechanical shaft seal usage

i) Advantages (2)

ii) Disadvantages (2)

Q7. (a) What do you understand by the term 'Boiler' and What is its function on board? (4)

(b) List out the uses of steam on board (4)

(c) Name the types of boilers generally used on ship and explain the differences (4)

(d) State the advantages of water tube boilers over smoke tube boiler (4)

Q7. Describe safety guidelines to be followed for the usage of the following tools:

(a) General safety precautions for electric tools (6)

(b) Safety precautions with powered abrasive tools like grinding, cutting, wire buffing tools (6)

(c) Safety precautions using pneumatic powered tools (4)

Q5. (a) What is the definition of the following terms: (6)
(i) Indicated Power
(ii) Specific fuel oil consumption
(iii) Brake power
(iv) Mechanical efficiency
(v) Thermal efficiency

(b) What is an Indicator diagram of diesel engine? Draw a diagram and show different points related to Diesel Engine power measurement. (6)

Q8. (a) Describe how the leak of a leaky tube in a heat exchanger is detected? How to rectify leaky tube? (8)

(b) Describe with reasons for the poor performance of a heat exchanger and actions to rectify the same (8).

Q1. (a) Sketch and describe the Starting air system of main engine. (8)

(b) What are the safety interlocks provided in compressed air Starting system of Main Engine? (8)

Q5. (a) Name the safety devices fitted on 2 Stage air compressors on ships. Explain their functional purpose as well as location of fitment, using a schematic diagram. (12)

(b) State the maintenance and checks carried out periodically in order to keep them efficient. (4)

Q9. (a) What do you understand by the term ‘Carnot cycle’ and ‘Reverse Carnot cycle’? (5)

(b) State limitations with cycle. (5)

(c) Explain briefly, absorption type refrigeration cycle with examples using line diagram. (6)

Q9. (a) Describe reasons for vibrations on centrifugal pumps while running (6)

(b) Give reasons for insufficient pressure developed by the centrifugal pumps (6)

(c) How is wear ring clearance of centrifugal pump measured (4)

Q9. a) Describe how fuel injector components deteriorate with time? (6)

b) What are effects of deterioration of fuel injector components? (6)

c) What are the signs of a bad injector? (4)