Exam 2 Fall 09 Solved

Exam 2 Fall 09 Solved - MEEN 222 Section 501 Fall 2009 Exam...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
MEEN 222 Section 501 Fall 2009 Exam 2 December 4, 2009 Print Name: _____SOLUTION___________________________________________ GENERAL INSTRUCTIONS: A. Exam time: 50 min B. Read carefully each question C. Numerical problems without clearly indicated procedure will be considered incomplete! D. Sign Aggie honor statement. (100 points + 10 extra points) Aggie Honor Code: “On my honor, as an Aggie, I have neither given or received unauthorized aid on this academic work” Signature: ____________________________________________________
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
_________ out of 100 + 10 extra points Part A. Fill the blanks or circle correct answer. A1 (3) (3) (3) (3) (3) (3) (3) (3) (3) (3) Please indicate whether the following statements are TRUE or FALSE. - Recrystallization is the formation of new set of strain-free and equiaxed grains that have low dislocation densities and are characteristic of precold-worked condition. TRUE / FALSE - Ductility is capacity of material to absorb energy when it is deformed elastically and then, upon unloading, to have this energy recovered. . TRUE / FALSE - Brittle fracture takes place without any appreciable deformation and by rapid crack propagation. TRUE / FALSE - Elastic deformation is instantaneous which means that total deformation occurs the instant the stress is applied or released, i.e. the strain is independent of time. TRUE / FALSE - Heat capacity is a property that is indicative of a material’s ability to transfer heat. TRUE / FALSE - Impurities in metals acts as scattering centers for electrons and thus increasing the concentration of impurities results in an enhancement of electrical resistivity. TRUE / FALSE - Electric dipole structure is formed when there is a separation of positive and negative electrically charged entities on a molecular or atomic level. TRUE / FALSE - Above Curie temperature, diamagnetic material behaves as ferromagnetic material. TRUE / FALSE - Two of the most important interactions between electromagnetic radiation and atoms, ions and/or electrons are electronic polarization and electron transition. TRUE / FALSE - Alloying process in semiconducting materials is termed doping. TRUE / FALSE
Background image of page 2
A2 (3) There is usually considerable variation and scattering in fracture strength for many specimens of a specific brittle ceramic materials. This phenomena may be explained by the dependence of fracture strength on the probability of a flaw that is capable of initiating crack, which in turn varies from specimen to specimen.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/05/2010 for the course MEEN 222 taught by Professor Radovic during the Spring '08 term at Texas A&M.

Page1 / 9

Exam 2 Fall 09 Solved - MEEN 222 Section 501 Fall 2009 Exam...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online