Liquid penetrant testing is a suitable method for almost any material. What can not be inspected by liquid penetrant testing method?

Explain why pre-cleaning is the most important step

Imagine a part that contains fatigue cracks which are detectable under no load using liquid penetrant technique. Would they still be detectable under tensile and compressive loads and why?

List the main human factors that affect the probability of detection in liquid penetrant testing.

What control measures should be considered in developer thickness layer?

List the advantages and disadvantages of the various developer types.

Additionally there are 10 marks given for organisation and presentation. You will be expected to show evidence of research and well balanced arguments supported by academic literature relevant to the problem (in addition to the learning package material). Note that that the marking scheme gives an indication of the expected length of each section. Explanations and descriptions should reflect this balance between sections and sub-sections.

A nozzle is is designed to achieve M=4 under expanded exit flow conditions. For the given total pressure and total temperature, calcuate:

a) exit Mach

b)mach at which normal shock occurs in the model

13.3     Why are clear objectives and standards needed in the appraisal process?

13.2     Why do supervisors appraise their employees? What in the process will benefit supervisors? What will benefit their employees?

In a surface condenser a section of the tubes near to the air pump suction is
screened off so that the air is cooled to a temperature below that of the condensate, separate extraction
pumps being provided to deal with air and condensate respectively. 5448 kg of steam are condensed
per hour and the air leakage is 4.54 kg/h. The temperature of the exhaust steam is 31°C, the temperature
of the condensate is 27°C, and the temperature at the air pump suction is 21.1°C. Assuming a constant
vacuum throughout the condenser, find
() The mass of steam condensed per hour in the air cooler;
(i) The volume of air in m3/h to be dealt with by the air pump;
(ii) The percentage reduction in necessary air pump capacity following the cooling of the air..

15.3     What does the Wagner Act prohibit?

Why are the parts manufactured using powder metallurgy of near net shape? For mixtures of dissimilar metal powders, explain how (a) blending/mixing, and (b) compaction are carried out before sintering. Explain how (i) blending/mixing and (ii) compaction steps influence the (a) sintering step and (b) porosity development in the processed part.

Define the phenomenon of Springback in sheetmetal forming, and provide a detailed explanation of the methods used to compensate for springback in finished sheetmetal products.

For each of the following pairs of polymers, plot and label schematic stress-strain curves on the same

graph [i.e. make separate plots for parts (a), (b) and (c)].

(a) Polychloroprene rubber having a number-average molecular weight of 100,000 g/mol and 15% of available sites cross-linked; liner polypropylene having a number-average molecular weight of 150,000 g/mol.

Consider a converging-diverging nozzle with an exit-to-throat area of 3. The inlet reservoir pressure is 1 atm and the exit pressure is 0.5 atm.

(a) For this pressure ratio a normal shock will stand somewhere inside the divergent portion of nozzle. Calculate the location of shock (A/At =?).

(b) back pressure if the flow were isentropic throughout.

In a combined cycle of gas turbine, can a steam turbine drive the same generator driven by the gas turbine? Or it must drives a separate generator?

Also, is there any gas power station that uses a gas other than natural gas? Please give an example. Also, is there a gas power station that uses synthesis gas?

A disk cam rotating at 200 rpm lifts a radial roller follower with simple harmonic motion through a maximum displacement of 2.5 in. while the cam rotates through 90°. There is then a dwell of the follower for 180° of cam rotation, followed by a return of the follower in simple harmonic motion in the remaining 90° of cam rotation. For a follower weight of 8 lb, determine the inertia force of the follower for each 15° of cam rotation and plot the result. Determine and plot the resultant of the weight force and inertia force. Determine the required spring constant of a spring which will maintain contact of the follower with the cam throughout the cam rotation.

How to calculate suitable spring rate for oscillating forced closed cam and follower having simple harmonic motion so that it will always in contact with cam.Also at which speed it will loss contact with cam and how much distance it will lift-off from cam.Please explain in detail with example using SHM equations and cam follower drawing with resolve forces.

A steel rotor disc of uniform thickness 50mm has an outer rim diameter 800mm and a central hole of diameter 150mm. There are 200 blades each of weight 2N at an effective radius of 420mm pitched evenly around the periphery. Determine the rotational speed at which yielding first occurs according to the maximum shear stress criterion. Yield stress= 750 MPa, ? = 0.304, ? = 7700 kg/m 3