Materials and Construction

351. The behaviour of visco-elastic material is time dependent. This behaviour is common in _________ materials.

1. Non-crystalline solid
2. Crystalline
3. Rubbery
4. Non-crystalline organic polymeric

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352. The carbonating tower used in Solvay process of soda ash manufacture is made of

1. Cast iron
2. Stainless steel
3. Karbate
4. Lead lined steel

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353. The chlorinator used in the manufacture of DDT is made of

1. Glass
2. Glass lined steel
3. Teflon
4. Bakelite

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354. The crystal structure of most of the common metals is

1. Orthorhombic
2. Cubic
3. Hexagonal
4. None of these

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355. The damage/deterioration of metals by the _________ action of fluids is called 'erosion'.

1. Abrasive
2. Corrosive
3. Both (A) & (B)
4. Neither (A) nor (B)

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356. The digester of a Gobar gas plant is a

1. Mild steel drum
2. Stainless steel vessel
3. Masonry well
4. Cast iron vessel

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357. The electrical conductivity of a _________ decreases with rise in temperature.

1. Metal/alloy
2. Semi-conductor
3. Dielectric
4. None of these

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358. The fermenter used for the production of ethyl alcohol from molasses is made of

1. Wood
2. Concrete
3. Copper bearing steel
4. Porcelain

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359. The fermenter used in the production of penicillin (by deep fermentation process) is made of

1. Glass
2. Glass lined steel
3. High silicon cast iron
4. Porcelain

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360. The formation of oxide film on a metal due to atmospheric exposure reduces its

1. Toughness
2. Stiffness
3. Creep limit
4. All (A), (B) & (C)

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