DieselShip's Online Content Library

Q1. Write short notes on following: (16)

A. Magnetic Particle Inspection (MPI)

B.  Ultrasonic Testing (UT)

C. Radiographic Testing (RT)

D. Liquid penetrant testing (PT)

Q1. a) Explain metal fatigue and how fatigue failure occurs. (4)

b) Differentiate between high stress/low cycle and low stress/high cycle fatigue giving

example of each. (4)

c) How do defects in the metal influence the expected life of a component. (4)

d) How does fuel injection timing and cylinder power balance influence the possibility

of fatigue cracks developing in the bedplate. (4)

Q1. What is understood by risk on board ship? As a 2nd engineer discuss various methods for hazard identification and assessment of risk available on board.

Q4. a) State the circumstances owing to which it may be necessary to renew a cylinder liner. (3)

b) Explain how the liner is removed (5)

c) Explain how the new liner is fitted. State the important checks to be made before and after fitting. (5)

d) How the liner wear rate is calculated. (3)

Q6: With reference to electro-hydraulic steering gears:

A. Sketch and describe a steering gear with two 50% torque units conforming to the single failure criteria. (8)

B. State, with reasons, the precautions necessary when operating on two rams only; (4)

C. Describe the tests necessary to ascertain that the gear will operate as required when one side of the circuit develops a malfunction. (4)

Q7. During the overhaul of medium- speed auxiliary diesel generator you find that the white metal of one of the bottom end bearings has cracked. Explain how you would fit a spare bearing and enumerate the various tests you would carry before putting the machine back into service.

Q8.With reference to crossheads:

a) Describe with sketches one arrangement whereby lubricant is fed to top end bearings, slippers, and guide.

b) Explain why the clearances of each top-end bearings are of vital importance.

c) state why booster pumps are sometimes used to feed lubricant to top end bearings.

Q8. a) Briefly discuss the different types of steam traps used on board, and how do you select the appropriate type for an oil tanker? (8)

b) What are the common maintenance tasks and frequency requirements for steam traps to ensure optimal performance, prevent steam leakage, and reduce energy losses, and how can regular maintenance help extend the lifespan of a steam trap. (8)

Q9. a) What are the key factors that influence the choice between a gear drive and a chain drive for a large marine engine. (6)

b) Define backlash and explain how backlash is measured and corrected in a gear drive of large marine engine. (5)

c) Discuss the effects of increased backlash on the performance and reliability of a large marine engine. (5)