Chemical Engineering MCQs

6108 MCQs  (Page 278 of 611)

Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?
A. Langmuir adsorption isotherm
B. Adsorption isobar
C. Freundlich adsorption isotherm
D. None of these
Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because____________________?
A. Cao is not dissociated
B. Co2 escapes continuously
C. Of high calcination temperature
D. Cao is more stable than caco3
A catalyst inhibitor____________________?
A. Lessens its selectivity
B. May be useful for suppressing undesirable side reactions
C. Is added in small quantity during the catalyst manufacture itself
D. All a., b. and c.
A batch reactor suffers from following disadvantage ?
A. Poor product quality control
B. High labour and handling cost
C. High shutdown time requirement for emptying, cleaning and refilling
D. All a., b. and c.
Which of the following is not a unit of reaction rate ?
A. Moles for med/(surface of catalyst) (time)
B. Moles formed/volume of reactor) (time)
C. Mole formed/volume of catalyst) (time)
D. None of these
The residence time distribution of an ideal CSTR is _____________________?
A. (1/η) exp (-t/η)
B. Η exp (-t/η)
C. Exp (-t/η)
D. (1/η) (-t/η)
If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is_______________________?
A. Not feasible
B. Just feasible
C. Very much feasible
D. Unpredictable as δg is no measure of feasibility of a reaction