Chemical Engineering MCQs

Page No. 410

Which of the following ratios defines the recycle ratio in a chemical process ?


aGross feed stream/recycle feed stream


bRecycle stream/fresh feed stream


cRecycle stream/gross feed stream


dNone of these



N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample? (Molecular weight of urea = 60) ?


a80%


b90%


c95%


d98%


View Answer 90%

The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are__________________?


a3.01 × 1022


b6.02 × 1023


c9.03 × 1024


d1.20 × 1024


View Answer 9.03 × 1024

Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume ‘X’ diffuses twice as fast as another perfume ‘Y’; what is the molecular weight of ‘Y’, if the vapor density of gas ‘X’ is 2? Molecular weight of gas ‘X’ is to be assumed to be 2 ?


a2


b4


c8


d16


View Answer 16

A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the ____________________?


aAtomic weight of the metal is 4


bEquivalent weight of the metal is 4


cAtomic weight of the metal is 2


dEquivalent weight of the metal is 8



The osmotic pressure of a solution increases, if its _____________ is decreased?


aVolume


bSolute concentration


cTemperature


dNone of these


View Answer None of these

The effect of pressure on the heat capacity of the gases ______________ is negligible?


aAt pressure below one atmosphere


bBelow the critical temperature


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies________________?


aXM < 0.5


bXM = 0.5


c0.5 < XM < 0.64


dXM ≥ 0.64


View Answer XM ≥ 0.64

Which of the following expressions defines the Baume gravity scale for liquids heavier than water ?


a(141.5/G) – 131.5


b145 – (145/G)


c200 (G-1)


d(400/G) – 400


View Answer 145 – (145/G)

A bypass stream in a chemical process is useful, because it___________________?


aFacilitates better control of the process


bImproves the conversion


cIncreases the yield of products


dNone of these



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