Gases have poor
A.Reflectivity
B.Absorptivity
C.Transmissivity
D.Absorptivity + transmissivity
E.Reflectivity + absorptivity
Category: Chemical Engineering Mcqs
Actual maximum flame temperatures for the pure combustible gases burnt in unpreheated air range from
A.1000 to 2000?F
B.2000 to 2500?F
C.2700 to 3000?F
D.3400 to 3800?F
The producer gas is mainly used in
A.petroleum refinery
B.fertilizer industry
C.steel industry
D.pharmaceutical industry
Fouling factor
A.Is dimensionless
B.Measures the heat transfer efficiency
C.Is virtually a factor of safety in heat exchanger design
D.Is used when a liquid exchanges heat with a gas
E.Is used only in case of Newtonian fluids
The highest value of thermal conductivity is expected for
A.Solid ice
B.Melting ice
C.Water
D.Boiling water
E.Steam
A radiation shield should have
A.low reflectivity
B.high reflectivity
C.high emissivity
D.None of the above
In propane deasphalting process the extractor pressure and temperature are
A.40 kgf/cm2 g and 130?C
B.1 kgf/cm2 and 30?C
C.175 kgf/cm2 g and 180?C
D.120 mm Hg and 30?C
Oxygen boils at -183?C, this temperature is
A.? 215?F
B.? 227?F
C.? 329?F
D.? 361?F
E.? 398?F
Which of the following is an example of a closed system
A.Scooter engine
B.Liquid cooling system of an automobile
C.Boiler in steam power plant
D.Air compressor
When a dephlegmator is also used to condense partially the overhead vapour from a distillation column the liquid reflux at its bubble-point
A.has the same composition as the overhead product
B.is richer in less volatile component than overhead product
C.is richer in more volatile component than overhead product
