Q1] ( Q2] Q3] Notes: Attempt All Total Answer with true (T) or false (F), corrects the wrong phrases, and gives short reasons for correct and corrected statements: 1- Manganese is the most important alloying element in steel after carbo 2- The machinability of cooled working steel enhanced by spheroidization. 3- lead improves machining characteristics of copper 4- All superalloys contain a small amount of carbon 5- The elongation of brass will increase as the zinc content increases Complete the following statements: 1- The main difference between isothermal transformation and continuous cooling diagrams are , and 2- The age hardened stainless steels have elements such as or which form strengthening precipitates when the material is heated to moderately elevated temperatures. 3- The disadvantages of beryllium include .br ..., and.......... 4- The precious metals include ..... 5- Monels are used for their strength and corrosion resistance in Select the most suitable answer 1- The stable form of iron at room temperature, is: and and a) 8- iron with BCC b) y-iron with FCC c) y -iron with BCC d) Not given 2- low temperature impact properties of low carbon steel will be improved by: a) Grain coarsening b) Fully killed c) Lowering Mn-C ratio d) All of these 3- Continuous air cooling of pre-heated hyper-eutectoid steel sample, resulting a microstructure consist of: a) Pearlite+Bainite b) Pearlite+Martensite c) Pearlite+Cementite d) Pearlite+ferrite 4- The lowest amount of carbon can be found in which of the following stainless steels: b) 410 c) 202 d) 316L a) 304 5- The property of a material that can't be significantly changed by heat treatment is: a) Elastic modulus b) Yield strength c) Ultimate tensile strength 6- For precipitation hardening, the alloy should exhibit: a) Decreasing solid solubility with increasing temperature b) Increasing solid solubility with decreasing temperature c) Complete solid solubility at both high and low temperatures d) Eutectic reaction 7- The symbol (W) in aluminium alloys means that the alloy was a) Age hardened b) Annealed 8- The composition axis in iron carbon phase a) 1.7 wt % C b) 4.3 wt % C 9- The corrosion resistance of magnesium is a) Higher than c) Cold worked diagram extends to c) 6.70 wt % C b) Lower than c) Same as to d) Elongation percentage d) All of these d) 100 wt % C that of aluminum d) can not be compared to 10-To increasing the creep resistance of nickel base superalloys the added alloying element can produce a) Solid-solution strengthening b) dispersion strengthening c) precipitation hardening d) all of these