Practice Test: Question Set - 02
1. The mean conversion in the exit stream, for a second order, liquid phase reaction in a non-ideal flow reactor is given by
2. Fluid flow in a real packed bed can be approximated as __________ model.
- (A) Plug flow
- (B) Dispersion
- (C) Mixed flow
- (D) Tank in series
3. The value of 'n' for a chemical reaction A → B, whose reaction rate is → CAn, will be __________ if the rate of the reaction increases by a factor of 8, when the concentration of is doubled.
- (A) 0
- (B) 1
- (C) 2
- (D) 3
4. The rate of an autocatalytic reaction as shown in the bellow figure, is given by -rA = k . CA . CB. In this case, the
- (A) Plot of - rA Vs CA is
a straight line with slope k
- (B) Plot of - rA Vs CA is
a hyperbola
- (C) Rate of disappearance of reactant A is maximum,
where CA = CB
- (D) Both 'b' & 'c'
5. __________ resistance is not involved in the combustion of a carbon particle.
- (A) Gas film
- (B) Ash
- (C) Chemical reaction
- (D) None of these
6. A stirred tank reactor compared to tubular-flow reactor provides
- (A) More uniform operating conditions
- (B) Permits operation at the optimum temperature for a long reaction
time
- (C) Higher overall selectivity for a first order consecutive reaction
- (D) All (a), (b) and (c)
7. A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are
- (A) Equal in size
- (B) Of different sizes
- (C) Of such size that the ratio of their volumes is < 5
- (D) None of these
8. Half life period of a first order irreversible reaction A → B is
- (A) k/2
- (B) ln k/2
- (C) ln 2/k
- (D) ln 0.5/k
9. An example of autothermal reactor operation is
- (A) Sulphur dioxide oxidation
- (B) Ethylene oxidation
- (C) Benzene oxidation
- (D) Ammonia synthesis
10. The value of Steric factor 'P' in the equation k = PZeE/RT usually ranges from
- (A) 1.0 to 10-8
- (B) 1.1 to 102
- (C) 0.1 to 0.9
- (D) None of these
11. Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?
- (A) Langmuir's assumption applies to every adsorbed layer
- (B) There is no dynamic equilibrium between successive layer
- (C) The adsorbed layer may be polymolecular in thickness and the heat of
adsorption in each layer (except the first one) is involved in each of the
evaporation process
- (D) None of these
12. 'Unreacted core model' represents the reaction involving
- (A) Combustion of coal particles
- (B) Roasting of sulphide ores
- (C) Manufacture of carbon disulphide from elements
- (D) None of these
13. Volume change for unimolecular type first order reaction as shown in the bellow figure, increases __________ with time.
- (A) Linearly
- (B) Exponentially
- (C) Parabolically
- (D) Logarithmically
14. The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalyzed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second).
- (A) L √(K/D1)
- (B) 1/[L√(K/D1)]
- (C) 1
- (D) ∞
15. In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is
- (A) More
- (B) Less
- (C) Same
- (D) Either (a) or (b), depends on other factors