October 2023 ECE Board Exam Version 2 Engr. Kaye Cristine Tolentino 62022 TOS GO) Seer nseomn f Teeny A group of atoms in cubic arrangement The smallest group of atoms which when regularly repeated forms a crystal~*~ 7 Simple Metal Space Lattices Simple Number Soordination number: 6 Nearest-neighbor distance: @ Packing factor (apf): 0.52 Coordination number: 8 Packing factor (apf): 0.68 Face-Centered Cubic Number of atoms per unit cell:4, Coordination number: 12 Nearest-neighbor distance: ¥2 Packing factor (apf): 0.74 2 Neto Dib. ©2022.79s Guestion Given the following data about nickel: structure is RZ FCC, atomic mass is 58.71 amu, atomic radius is 0.125 nm,’ what is the theoretical density? Pra Sa In CE ee) Claas?) ik alata FotoThe density of vanadium is 5.89 g/cc, its atomic number is 23, its atomic weight is 50.94 amu, and its structure is BCC. EOE Rum UCR CR CULE Oly (90.94 loi) Loterrs)( pee: ‘nee iy Peet i Sax dioll ean eae ere What are the indices of the direction along the face diagonal of a cubic crystal? [an,0) CreN iC cn aC kG aD) CD)Molecules of a polymer are not held together by Time mur RColele Hydrogen Bonds Primary Bonds pn a Ge recon Cereals (eet need ear MasA test specimen is subjected to a stress anda tele al) ole LLC te Ld level that caused the crack to appear. The crack will continue to propagate in the original The crack will stop growing direction The crack will propagate in a direction normal to the original The specimen will self destruct If the load on a test material is carried beyond the ultimate tensile strength of the material, it will: Return to its normal Permanently maintain its configuration deformed condition Continue bending until strain oe aor eo failure occursPeco Soe ery) teh erat) ioe rae Normal O= EES Srear T= GO ae ee ea Parra ae eee eeBer Res PCR} EOC Mae ee it Which of the following may be a Poisson’s elie) Murata \etona al aWhich of the following may be a Poisson’s Pelee) eMule Lied laces Mira R URS aera Causa | nee | ailThe number of electrons in the Ponductionibend The number of impurity atoms The binding energy of outer Collisions between conduction electrons electrons and atoms For a semiconductor at room temperature, the temperature coefficient of resistivity is determined primarily by: The number of electrons in the eomancticn bare The number of impurity atoms The binding energy of outer Collisions between conduction electrons electrons and atoms—s PSUR eM oe r of a metal The diffusion coefficient of a decreases solute decreases The conductivity of an intrinsic The resistivity of a semiconductor increases superconductor approaches 0 The strong magnetic behavior exhibited by permanent magnets is called 7 Paramagnetism Diamagnetism Ferromagnetism SuperconductivityIn a ferromagnetic alloy, easy migrati boundaries usually results in 4 Permanent magnetism Good conductivity A very weak net magnetic Superconductivity at low movement temperatures In a ferromagnetic alloy, easy migration of domain eee eee ey poly oy Bert Nad re rs Permanent magnetism Good conductivity A very weak net magnetic Superconductivity at low movement temperaturesBTS (ew Toned TTemp, slowly cools down TTemp, rapidly cools down a SVM Thara, thar, vauchia TEMPERIN G Deere CUT an a eel mse ee See ae eter) Which of the following is/are used for corrosion feel Clee Annealing Tempering Both Annealing and Neither Annealing nor Tempering TemperingSiem aml oil MYM t te MColmes ele Key ToL) protection? Ee Both Annealing and Neither Annealing nor Tempering Tempering In regard to corrosion, which of the following is Tena d The cathode loses mass Oxidation occurs at the anode The anode and cathode must Water usually plays an be electrically connected important roleAt room temperature, low-carbon steel is almost Cry hg 5 E Forme tures | STEEL (Zen + Carbon) ara ay a Lee ee ae ane aoe aa ees ae De oer cay ee eee re -2 4 wth C eae ide aay See era ad rue eae eee eeeNet Te OT (Cr lon OD Sia Sea Sanaa ect aD) pach eee ee i Gra apenas L (als \hah ea eS Coe ere re) Tae U TMM RU Ce Coe) concentration of 0.5% carbon, what phase(s) is(are) present at 750 degrees Celsius? pforme nee Austenite MartensiteAt room temperature, a plain carbon steel containing 0.2 weight percent carbon is ReR EN Highly alloyed Heat treating of steel most frequently involves which of the following? Martensite PearliteMER ia eee Rees ML) to 900 degrees Celsius, what phase is present? | ewe — For the equilibrium phase diagram, (a) what is the eutectic composition? (b) See iL amelie temperature? (c) what is the lesser composition of the solid phase of X in equilibrium at eutectic Cc ae Rom LE temperature? le Wea Ee RU Un eR ate)PMU CE Ch MCR CM elle Boley el lee) le eR R BURR cm-l els )olela | static load of 800 N. What is the BHN of eligible alloys? Gnnels Harcnecs Number meat M Me [e-em Lm eam Od) to 9, by what factor does the number of grains TEM OL) @i(-1 (ee) MYL Meir Lble [Wea Ca Non ae et a a ahaa ern ean en eer a eens) Neate ina Saas Veer wane iP| Which of the following statements is FALSE? Wavelength of visible light > Frequency of radio waves < wavelength of microwaves frequency of infrared waves Wavelength of x-rays > Frequency of ultraviolet > wavelength of gamma rays frequency of infrared Which of the following will NOT change when light Or aig eau md f oreston fF reavrey |sada aol a Re NS ota ae 2 aT DTN eons enve | = etn] Pe DEP na Renae nase} = ¥ A Re af RY "se Images produced by convex mirrors are always Smaller than the object The same size as the object Larger than the object None of the aboveIf the object is outside the focal point of a concave mirror, the image will be Virtual and inverted Virtual and upright aman oan An object is 2f in from of a converging lens of focal length f. Which of the following is lel ttre The image is real, inverted, The image is real, inverted, and magnified. the same size as the object. The image is real, upright, the The image is virtual, inverted, same size as the object. and smaller.Sadie mene cen uke) erging lens with a focal length of -24.5 cm. What is the rT ues Centr Cats ea Satta for ii two en re eT) eae Rear) it is held 0.1 m from an object being viewed? cratoragy ed