Chemical Engineering Basics

761. Which of the following does not have a sharp melting point?

1. Thoria
2. Glass
3. Ice
4. Pig iron

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762. Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?

1. Nitrogen oxides
2. Hydrocarbons
3. Both 'a' & 'b'
4. Carbon monoxide

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763. Which of the following equipments is used for liquid dispersion?

1. Packed column
2. Venturi scrubber
3. Bubble cap plate column
4. Wetted wall column

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764. Which of the following fastening devices has a head at one end and a nut fitted to the other?

1. Bolt
2. Stud
3. Top bolt
4. None of these

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765. Which of the following fastening devices has its both ends threaded?

1. Bolt
2. Stud
3. Set screw
4. Split nut

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766. Which of the following forces does not act on a fluid at rest?

1. Viscous force
2. Gravity force
3. Hydrostatic force
4. Surface tension force

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767. Which of the following gases cause global warming?

1. Carbon monoxide
2. Carbon dioxide
3. Nitrogen
4. Ozone

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768. Which of the following hardness tests does not measure the indentation hardness of metals and alloys?

1. Vickers hardness test
2. Shore scleroscope test
3. Brinell hardness test
4. Rockwell hardness test

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769. Which of the following has the highest modulus of elasticity (about 7 × 106 kg/cm²)?

1. High speed steel
2. Stainless steel
3. Tungsten carbide
4. Superalloys

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770. Which of the following has the highest value of refractive index?

1. Brine (sea water)
2. Diamond
3. Distilled water
4. Glass

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