Engineering Materials

171. Weld decay is the phenomenon found with

1. cast iron
2. mild steel
3. non-ferrous materials
4. wrought iron
5. stainless steel.

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172. Which is false statement about annealing. Annealing is done to

1. relieve stresses
2. harden steel slightly
3. improve machining characteristic
4. soften material
5. permit further cold working.

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173. Which is false statement about case hardening. Case hardening is done by

1. electroplating
2. cyaniding
3. induction hardening
4. nitriding
5. flame hardening.

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174. Which is false statement about normalizing. Normalizing is done to

1. refine grain structure
2. reduce segregation in casting
3. improve mechanical properties
4. induce stresses-
5. relieve internal stresses.

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175. Which is false statement about properties of aluminium

1. modulus of elasticity is fairly low
2. wear resistance is very good
3. fatigue strength is not high
4. creep strength limits its use to fairly low temperatures
5. corrosion resistance is good.

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176. Which is false statement about tempering. Tempering is done to

1. improve machinability
2. improve ductility
3. improve toughness
4. release stresses
5. reduce hardness and brittleness.

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177. Which is the false statement about wrought iron. It has

1. high resistance to rusting and corrosion
2. high ductility
3. ability of hold protective coating
4. easily weldable characteristics
5. uniform strength in all directions.

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178. Which of the following alloys does not contain tin

1. white metal
2. solder admiralty
3. fusible metal
4. phosphor bronze
5. gun metal.

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179. Which of the following alloys does not have copper as one of the constituents

1. delta metal
2. monel metal
3. constantan
4. nichrome
5. silicon bronze.

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180. Which of the following constituents of steels is softest and least strong

1. austenite
2. pearlite
3. ferrite
4. cementlte
5. bainite.

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