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Q7. Write short notes on the following:

(a) Ultrasonic testing (8)

(b) Shaft earthing device (8)

Q1. Describe briefly the methods of carrying out a bend test and an impact test. Illustrate the general form of the test pieces used and state how the final results are given for comparison of different materials. Of what practical use are the figures obtained?

Q6. Describe the following metallurgical tests and explain why EACH is carried out:

(a) Impact test (4)

(b) Hardness test (4)

(c) Endurance test (4)

(d) Tensile test (4)

Q5: With reference to fatigue of engineering components explain the influence of stress level and cyclical frequency on expected operating life;

A. Explain the influence of material defects on the safe operating life of an engineering component;

B. State the factors which influence the possibility of fatigue cracking of a bed-plate transverse girder and explain how the risk of such cracking can be minimized.

Q1. a) Define creep and specify the conditions under which it occurs? (8)

b) Discuss three metallurgical processing techniques that are employed to enhance the creep resistance of metal alloys (8)

Q3. Express your reactions and state the subsequent investigation you would make if a laboratory report on a used diesel engine oil sample indicated the presence of appreciable amounts of: (16)

A. Iron

B. Copper

C. Antimony and Tin

D. Silicon

E. n-pentane and toluene insoluble.

Q6. Briefly describe the tests made on a piece of metal to determine its suitability for use in engineering. Explain clearly what is meant by any four of the following metallurgical terms:

(a) Work hardening,

(b) Cased hardening,

(c) Annealing,

(d) Normalising,

(e) Nitriding.

Q7. With reference to steels used in shipbuilding and marine engineering:

(a) describe EACH of the following types of failure;

(i) Brittle failure;

(ii) Ductile failure.

(b) Explain the term ductile to brittle transition stating the factor that determines ductile to brittle transition.

(c) Describe a test to determine the value of brittle fracture of a specimen test piece.

Q2. (a) Materials used for hull and machinery are subject to stress and strain in service.

Define EACH of the following:

(i) types of stress;              (ii) types of strain

(b) Describe the tests that may be carried out on steel to be used for ships side plating.(5)