For protection of acquatic life in a fresh water stream sewage effluent should never lower the dissolved oxygen content lower than
A.15 ppm
B.10 ppm
C.5 ppm
D.20 ppm
Category: Chemical Engineering Mcqs
In a cooling tower makeup fresh water must be added to replace losses from
A.entrainment
B.evaporation losses
C.blowdown
D.all of the above
Which of the following is more accurate to determine the number of theoretical stages required for the separation of nonideal binary systems by distillation?
A.McCabe ? Thiele method
B.Ponchon ? Savarit method
C.Both McCabe ? Thiele and Ponchon ? Savarit methods are equally good.
The statement that the emissivity and absorptivity of a surface is surrounded by its own temperature are the same for both monochromatic and total radiation, is known as
A.Stefan Boltzman low
B.Kirchhoff’s law
C.D’Alembert’s rule
D.Lambert law
E.Law of emissivity
Which would give the greater amount of heat per cubic foot?
A.Hydrogen
B.Carbon monoxide
C.Hydrogen sulphide
D.Methane
If y* = x the relative volatility ? for a binary system is always
A.zero
B.one
C.infinity
D.one except at x = 0 or 1
Capillary is due to
A.adhesion
B.cohesion
C.both adhesion and cohesion
D.neither adhesion nor cohesion
The ratio of the actual equilibrium partial pressure of a component to the ideal value is called
A.activity coefficient
B.turbdown ratio
C.relative volatility
D.fugacity
In constant volume Hydrogen gas Thermometer, a correction has to be applied, because
A.Hydrogen is impure
B.Expansion of Hydrogen is non-linear
C.Density of mercury changes
D.None of the above
The batch reactor has the disadvantage(s) of
A.high labour and handling cost
B.Poorer quality control of the product
C.considerable shutdown time to empty, clean out and refill
D.all of the above
