Chemical Engineering Basics

671. The refrigerant freon-12 is chemically

1. CCl₂F₂
2. CClF
3. CClF₃
4. CCl₄F

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672. The rolling process cannot be used to produce

1. Plates
2. Rods
3. Tubes
4. Wires

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673. The same volume of all gases is representative of their

1. Specific gravities
2. Densities
3. Gas characteristic constants
4. Molecular weights

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674. The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally sed.

1. Hard
2. Soft
3. Silicon carbide
4. Aluminium oxide

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675. The specific gravity of coal depends mainly on its __________ content.

1. Carbon
2. Volatile matter
3. Ash
4. Moisture

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676. The starting of a car takes time in winter, because the

1. Octane number of fuel is decreased
2. Fuel supply for ignition is not sufficient
3. Vaporisation of the fuel is decreased
4. Pour point of fuel decreases

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677. The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the __________ point of the material.

1. Elastic
2. Ultimate
3. Yielding
4. Breaking

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678. The substance used as a smoke screen in warfare is

1. C₂H₂
2. SiCl₄
3. P2O₅
4. PCl₅

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679. The surface tension of a liquid, at critical temperature is

1. Indeterminate
2. Zero
3. Infinity
4. Same as that at any other temperature

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680. The swift cup test evaluates the following property of a sheet metal.

1. Stretchability
2. Drawability
3. Bendability
4. None of these

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