84) The emf of the galvanic cell is a) -0.304 V b) -0.128v c) 1.184 v d) -2.768v

Question

84) The emf of the galvanic cell is a) -0.304 V b) -0.128v c) 1.184 v d) -2.768v 85) Metals with a low modulus of elasticity are relatively a) Stiff and do not deflect easily b) Stiff but deflects easily c) Flexible and deflects easily d) Flexible but does not deflect easily 86) Precipitation hardening is a useful strengthening mechanism but it has the following disadvantage a) Only applicable to single crystals b) Not suitable if the material is to be used at elevated temperatures c) Carbides always form along the grain boundaries and decreases its corrosion resistance d) Answers a.) and b.) e) Answers b.) and c.) Answers a.), b.), and c.) 87) The aging step in precipitation harden alloys most likely involves non-steady state diffusion. a) True b) False 88) In TIG welding for an aluminum alloy, a pool of liquid metal is placed in the weld joint. Since the base metal is at room temperature and has a high thermal conductivity, the final solidification structure in the weld will be a) A single crystal b) Columnar crystals c) Equiaxed crystals d) Martensitic

Explanation / Answer

84. (c) 1.184 V

85. (c) Flexible and deflects easily.

86. (e) both B and C are correct.

87.(a) True

88. (d) Martensitic

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