Question

1. Choice question: there are four choices marked A), B), C) and D) for each question, decide which the best answer is. Then put the corresponding letter into the bracket (10 marks for 10 questions). 1). Which of the following materials is not composite: A. human being bone B. wood C.ABS D. WC-Co cemented carbide 2). Generally there are three structures in phase diagram, they are: A. solid solution, compound, mechanical mixture B. solid solution, compound, composite C. solid solution, composite, alloy D. metal, compound, mechanical mixture 3). General heat treatment of 45carbon steel is A.Q uenching B.Normalizing C.Annealing D. Martempering (quenching and tempering) 4). Which of the following terminology is mechanical mixture? A. Pearlite B. Cementite (FeC) C.Austenite D. Metallic Solid Solution 5). Which is correct formula of eutectoid reaction) cooling cooling cooing heating B. co-heating: γ + E D. L heating heating 6). Which material are classified as tool carbon steel? A. W18Cr4V B.T12A C. CrWMn D.20CrMnTi 7) which of the following factors is not covered relating to forgeability?) A. Temperature B. Deformation speed C. Stress state D. Conductibility

Answer 1