Chemical Engineering MCQs

Page No. 406

A bolometer is __________________?


aUsed for the measurement of thermal radiation


bAn element which senses optical input and delivers thermal output


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

1 ata is equivalent to_________________?


a1 atm


b10 torr


c0.98 Pascal


d1 kgf/cm2


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


bIncreases with rise in pressure


cIncreased with decrease in pressure


dUnchanged with pressure changes



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


bNearly equal to 4.69 atm


cSignificantly more than 4.69 atm


dIndeterminate due to lack of data



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


b100°C


cBetween 100 and 110°C


d110.6°C



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


bLess than 80.1°C


c100°C


dGreater than 80.1°C but less than 100°C



For an ideal gas, the compressibility factor________________?


aDecreases with pressure rise


bIs unity at all temperature


cIs unity at Boyle’s temperature


dZero



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


aIs saturated


bIs unsaturated


cShows negative deviation from Raoult’s law


dShows positive deviation from Raoult’s law



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


aSaturated


bSuperheated


cUnsaturated


dDry gaseous


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)


b°API = (141.5/G) – 131.5


c°API = (140/G) – 130


d°API = 145 – (145/G)



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