Chemical Engineering Basics

311. Hot working of lead is carried out at

1. 75°C
2. 373°K
3. 150°C
4. Room temperature

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312. Hydro-cyclone is a

1. Crusher
2. wet classifier
3. Dry classifier
4. Magnetic separator

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313. Hydrogen can be

1. Used in I.C. engines as fuel
2. Liquefied & stored under cryogenic conditions
3. Produced by electrolysis of water
4. All (A), (B) & (C)

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314. Hydrogen in liquid steels is dissolved

1. As tiny gas bubbles
2. In the atomic form
3. In the ionic form
4. In the molecular form

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315. Identify the correct statement with reference to the extractive metallurgy of aluminium.

1. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3
2. Approximately 80% of the aluminium deposited on the cathode comes from cryolite
3. Sodium is deposited along with aluminium, but is immediately vaporised
4. Anode effect sets in when the cryolite concentration goes below 40%.

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316. Identify the correct statement.

1. Sphlerite is zinc oxide
2. The first law of the thermodynamics is stated as δE = δQ - δW
3. Lead can be produced in a blast furnace
4. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite

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317. Identify the false statement

1. Martensitic steels are less susceptible to pitting corrosion than austenitic steels
2. Pitting corrosion is usually very localised
3. Hydrogen embrittlement is facilitated by tensile stress
4. Stress corrosion cracking is facilitated by tensile stress

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318. If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

1. Critical
2. Breeder
3. Fertile
4. Heterogeneous

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319. If a solid is compressed adiabatically in its elastic range, its __________ remains constant

1. Internal energy
2. Enthalpy
3. Entropy
4. Temperature

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320. If Reynolds number is greater than 1, then the

1. Viscous force is larger than the inertia force
2. Inertia force is larger than the viscous force
3. Inertia force is larger than the surface tension force
4. Inertia force is larger than the gravitational force

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