● . In the US, how are the abilities of substances to cause cancer classified? are their carcinogenicity (To clarify: I mean, how - or from what data determined?) - What are CTDs? How might they manifest due to occupational activities (in general)?

Multiple choice questions, please help thank you!! 1. The chemical potential (μ) of smaller size clusters is bigger than that of bigger size clusters because of  (a) their small size  (b) the fewer number of atoms in them (c) surface area is smaller (d) their surface is more curved 2. Which of these characteristics would you associate with SEM: A surface imaging tool Maintained under vacuum Provides imaging and compositional data Uses a scanned electron beam All of the above   3. Secondary electrons (SE) are best described as Low energy electrons from the sample surface  High energy electrons from the sample surface  Low energy primary beam electrons  High energy primary beam electrons 4. Atomic force microscopy (AFM) is the most widely used form of scanning probe microscopes for the characterization of nanomaterials since it require: (a) electrically conductive and optically transparent samples (b) neither electrically conductive nor optically transparent samples (c) electrically…

(a) An infrared gas analyser has a span of 01% of the component being measured. It operates at atmospheric pressure and was calibrated when the barometric pressure was 0.995 bar. The barometric pressure changes to 1.015 bar. What will the instrument read when the actual percentage of the component is (i) 0.5% (ii) 0.8%?

Non destructive testing 1. Give your analysis on how NDT can be use in the current industry. 2. Rank all kinds of NDT from the most expensive to the cheapest. 3. What is the most used NDT process in the industry? check the image below for guide.

under DE (radioactive decay)

QUESTION 3 An engineer has identified epoxy, a thermoset as an effective candidate for a specific application in humid and lightly corrosive conditions. However, the low stiffness or low modulus of elasticity of epoxy is a potential problem. Can you suggest any other suggestion to him? Justify your answer.

What are valid reasons for adding Yttrium to the zirconia in the Thermal Barrier Coating (TBC) in a turbine blade? Select one or more: a. To increase the weight of the TBC b. To match the thermal conductivity of the TBC to the underlying oxide layer To avoid breakage during change in thermal conditions d. To prevent a change of the crystallographic structure as the temperature changes To match the thermal conductivity of the TBC to the metal substrate C. e.

6. Describe each of the following crystal structure imperfections: a) substitutional atom; b) interstitial atom; c) vacancy. 7. At equilibrium, what is the maximum amount of carbon that can dissolve in pure iron at 600°C (by wt%). If the carbon content exceeds this maximum value, briefly describe the microstructure of the resulting alloy. 8. Give an example of a stress concentration in a metal part. 9. How would you expect the mechanical properties of a metal with an FCC structure to differ from one with a BCC structure? Why? 10. What is a slip system and how is it different than a slip plane?

Nitesh

Question 4: It is planned to drill a gas well in a field in the desert near Abu Dhabi. The gas also contains 3% CO2 and 1% H2S. The gas is expected to produce condensate (i.e. Wet Gas). a) What information do you need to conduct a materials selection study for the casing and tubing for this well? b) If you select steel as the material, what are the main corrosion dangers and how will you minimize these dangers?