Chemical Engineering MCQs

Page No. 406

A bolometer is __________________?


aUsed for the measurement of thermal radiation

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bAn element which senses optical input and delivers thermal output

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

1 ata is equivalent to_________________?


a1 atm

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b10 torr

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c0.98 Pascal

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d1 kgf/cm2

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View Answer 1 kgf/cm2

In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is__________________?


aIndependent of temperature

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bIncreases with rise in pressure

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cIncreased with decrease in pressure

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dUnchanged with pressure changes

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At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be_________________?


aSignificantly less than 4.69 atm

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bNearly equal to 4.69 atm

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cSignificantly more than 4.69 atm

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dIndeterminate due to lack of data

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The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. The temperature at which the above mixture will exert a pressure of one standard atm. is___________________?


aLess than 100°C

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b100°C

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cBetween 100 and 110°C

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d110.6°C

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Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is__________________?


a80.1°C

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bLess than 80.1°C

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c100°C

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dGreater than 80.1°C but less than 100°C

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For an ideal gas, the compressibility factor________________?


aDecreases with pressure rise

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bIs unity at all temperature

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cIs unity at Boyle’s temperature

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dZero

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An Azeotropic solution of two liquids has boiling point lower than either of them, when it_____________?


aIs saturated

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bIs unsaturated

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cShows negative deviation from Raoult’s law

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dShows positive deviation from Raoult’s law

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A vapor whose partial pressure is less than its equilibrium vapor pressure is called the _____________ vapor?


aSaturated

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bSuperheated

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cUnsaturated

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dDry gaseous

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View Answer Superheated

Specific gravity on API scale is given by the relation (where, G = specific gravity at 15.5°C) ?


a°API = 200(G – 1)

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b°API = (141.5/G) – 131.5

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c°API = (140/G) – 130

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d°API = 145 – (145/G)

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