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) 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. 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)

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)

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. 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)

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).

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)