Materials and Construction

161. Evaporators used in caustic soda recovery and production plant are made of

1. Monel metal
2. Gun metal
3. Wood metal
4. Babbitt metal

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162. Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the

1. Ultimate tensile strength (U.T.S.)
2. Endurance limit
3. Elastic limit
4. None of these

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163. Fatigue failure of a material may occur, when it is subjected to _________ stress.

1. Fluctuating
2. Tensile
3. Compressive
4. Torsion

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164. Fatigue failure of a material results from _________ stress.

1. Tensile
2. Compressive
3. Fluctuating
4. None of these

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165. Fatigue strength of a material increases by

1. Having notches in the specimen
2. Rise in temperature
3. Under stressing the specimen
4. Having scratches on the surface

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166. Fermenter used in the production of penicillin by deep fermentation process is a _________ lined steel vessel

1. Rubber
2. Monel
3. Glass
4. Nickel

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167. Ferric stainless steels compared to austenitic stainless steels

1. Have lower corrosion resistance
2. Are harder to fabricate
3. Are less ductile and hence less suitable for cold pressing
4. All (A), (B) and (C)

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168. For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is

1. Stainless steel
2. Cast iron
3. Aluminium
4. Nickel

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169. For platinum thermocouples, lead wires are made of

1. Copper & copper-nickel alloys
2. Copper & iron
3. Iron & nickel
4. Tin & nickel

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170. For spinning viscose rayon, the extrusion spinnerettes are made of

1. Platinum or gold alloys
2. High carbon steel
3. Aluminium
4. Nickel

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