46. Which of the following item is NOT belong to semiconductor properties:
(A) Resistance between and 10⁸ Ω-cm,
(B) higher operating temperature,
(C) electrical properties can be altered when controlled amounts of impurity atoms added to their crystal structures,
(D) has a smaller energy gap
(E) none of the above ?

1. Ferrous metals include which of the following: (A) aluminum, (B) brass, (C) copper,(D) gold, (E) steel?

2. Which one of the following engineering materials is defined as a compound containing metallic and nonmetallic elements: (A) ceramic, (B) composite, (C) metal, (D) polymer, (E) sand?

3. Which of the following processes start with a material that is in a fluid or semifluid state and solidifies the material in a cavity: (A) casting, (B) forging, (C) machining, (D) turning, (E) pressing?

4.Particulate processing of metals and ceramics involves which of the following step: (A) adhesive bonding, (B) deformation, (C) forging, (D) material removal, (E) sintering?

複選題5. Deformation processes include which of the following: (A) casting, (B) drilling, (C) extrusion, (D) sintering, (E) milling?

6. Which one of the following is the correct definition of ultimate tensile strength, as derived from the results of a tensile test on a metal specimen: (A) the stress encountered when the stress-strain curve transforms from elastic to plastic behavior, (B) the maximum load divided by the final area of the specimen, (C) the maximum load divided by the original area of the specimen, (D) the stress observed when the specimen finally fails (E) none of the above?

複選題7. Which one of the following types of stress-strain relationship best describes the behavior of most metals at room temperature: (A) elastic and perfectly plastic, (B) elastic and strain hardening, (C) perfectly elastic, (D) perfectly plastic (E) none of the above?

8. Which one of the following types of stress-strain relationship best describes the behavior of metals at temperatures above their respective recrystallization points: (A) elastic and perfectly plastic, (B) elastic and strain hardening, (C) perfectly elastic, (D) perfectly plastic (E) none of the above?

9. Which one of the following materials has the highest modulus of elasticity: (A) aluminum, (B) diamond, (C) steel, (D) titanium, (E) tungsten?

10. Which one of the following manufacturing processes will likely result in the best surface finish: (A) arc welding, (B) grinding, (C) machining, (D) sand casting, or (E) sawing?

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