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Chemical Engineering
Chemical Reaction Engineering
Quiz 3
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Q.1
For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of
Ideal plug flow
Bypass
Dead zone
Chanelling
Q.2
The increase in the rate of reaction with temperature is due to
Increase in the number of effective collisions
Decrease in activation energy
Increase in the average kinetic energy of the reacting molecules
None of these
Q.3
Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an __________ reaction.
Elementary
Parallel
Consecutive
None of these
Q.4
Which of the following factors control the design of a fluid-solid reactor?
Reaction kinetics for single particle,
Size distribution of solids beingtreated
Flow patterns of solids and fluid in the reactor
All of the above
Q.5
Pick out the wrong statement.
The integral method of analysing kinetic data is used when the data is scattered
The differential method of analysing kinetic data requires more accurate or larger amounts of data
When the reaction rate is independent of temperature, the reaction is said to be of zero order
He ratio of volumes of plug flow reactor to that of mixed reactor is always less than one for identical feed composition, flow rate, conversion and for all positive reaction orders
Q.6
If C
A
is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to
(C
A
)
n
(1/2)
n
.C
A
(C
A
)
1/n
(C
A
)
1/2n
Q.7
Pick out the correct statement.
A catalyst does not change AH of the reaction
A catalyst changes the equilibrium point
Law of mass action was suggested by Le-Chatelier
The difference between the energy of reactants and that of the products is the activation energy
Q.8
Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.
Higher
Much higher
Lower
Much lower
Q.9
The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the
Space time for each parallel line is same
Space time for parallel lines is different
Larger reactors have more space time compared to smaller ones
None of these
Q.10
Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)
Tan hT/tan T
Tan hT/T
Tan T/T
None of these
Q.11
Photochemical reaction rate does not depend significantly on temperature, because
It is a reversible reaction
It is an exothermic reaction
The energy of reacting molecules exceeds the activation energy by absorption of light
None of these
Q.12
A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
Less than
Equal to
More than
Equal to or more than
Q.13
BET apparatus
Measures the catalyst surface area directly
Operates at very high pressure
Is made entirely of stainless steel
None of these
Q.14
Which of the following is the most suitable for isothermal operation?
Batch reactor
Back-mix reactor
Plug-flow reactor
Fixed bed reactor
Q.15
Rate of a chemical reaction is not influenced by the
Catalyst
Temperature
Reactants concentration
Number of molecules of reactants taking part in a reaction
Q.16
A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes.
4
8
12
16
Q.17
For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min⁻¹ . What will be the conversion for a PFR with a space velocity of 0.2 min⁻¹? Assume that all the other operating conditions are the same for CSTR and PFR.
0.15
0.30
0.60
0.90
Q.18
Molecularity of an elementary reaction, P + Q → R + S is
1
2
3
4
Q.19
A high space velocity means that a given
Reaction can be accomplished with small reactor
Conversion can be obtained with a high feed rate
Both A and B
None of these
Q.20
Thermodynamic equilibrium constant in a system is affected by
Inerts
Pressure
Temperature
All of the above
Q.21
For the reversible reaction A ⇋ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium?
0.253
0.338
0.152
0.637
Q.22
With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.
Increases
Decreases
Remains unaffected
Unpredictable from the data
Q.23
Half life period of a chemical reaction is proportional to C
A
0
-1
, if the reaction is of __________ order.
First
Zero
Second
Third
Q.24
A photochemical reaction is
Accompanied with emission of light
Catalysed by light
Initiated by light
All of the above
Q.25
A rise in temperature
Normally tends to increase the reaction rate
Does not affect a catalysed reaction
Does not affect photo-chemical reaction rates
All of the above
Q.26
The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is
0.5
-0.5
1
1.5
Q.27
A catalyst in a chemical reaction
Decreases the activation energy
Alters the reaction mechanism
Increases the frequency of collisions of reacting species
All of the above
Q.28
With increase in temperature, the rate constant obeying Arhenious equation
Increases
Decreases
Decreases exponentially
Can either increase or decrease ; depends on the frequency factor
Q.29
A backmix reactor
Is same as plug-flow reactor
Is same as ideal stirred tank reactor
Employs mixing in axial direction only
Is most suitable for gas phase reaction
Q.30
For reaction, P + 2 → 3R, molar rate of consumption of P is
Double of that of Q
Same as that of Q
Half of that of Q
2/3
rd
of that of Q
Q.31
If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst
Porosity is very important
Porosity is of less importance
Internal surface area is utilised efficiently
None of these
Q.32
Oil is hydrogenated using nickel catalyst in a __________ reactor.
Batch
Slurry
Fluidised bed
Fixed bed
Q.33
A back mix reactor is
Suitable for gas phase reactions
Ideal at very low conversion
Same as plug flow reactor (PFR)
Same as ideal stirred tank reactor
Q.34
A batch reactor is
Suitable for gas-phase reactions on commercial scale
Suitable for liquid phase reactions involving small production rate
Least expensive to operate for a given rate
Most suitable for very large production rate
Q.35
A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.
Both conversion as well as concentration are same
Conversion in both will be the same but concentrations will be different
Both the conversion as well as concentrations will be different
None of these
Q.36
When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield.
Is greater than
Is smaller than
Equals
Can be either greater or smaller than (depends on the type of reaction)
Q.37
An exothermic reaction takes place in an adiabatic reactor. The product temperature __________ reactor feed temperature.
Is always equal to
Is always greater than
Is always less than
May be greater or less than
Q.38
Bulk diffusion in catalyst pore __________ with increase in pressure.
Increases
Decreases
Remains unchanged
Increases exponentially
Q.39
The unit of frequency factor in Arhenious equation is
Same as that of rate constant
Same as that of activation energy
Dimensionless
None of these
Q.40
The rate of reaction of a/an __________ reaction is not affected by temperature rise.
Autocatalytic
Photochemical
Consecutive
Zero order
Q.41
For a first order chemical reaction, the rate constant
Changes on changing the concentration units
Is not a function of the unit of time
Has unit of time⁻¹
None ofthese
Q.42
Pick out the wrong statement pertaining to space velocity of flow reactors.
The unit of space velocity is (time)⁻¹
The space velocity of 3 hr⁻¹ means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour
The space velocity of 3 hr⁻¹ means that one third reactor volume of feed at specified conditions are being fed into the reactor
None of these
Q.43
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by
Diffusion within the pellet
Reaction
External mass transfer
None of the above
Q.44
For a __________ order reaction, the units of rate constant and rate of reaction are the same.
Zero
First
Second
Fractional
Q.45
A catalyst
Initiates a reaction
Lowers the activation energy of reacting molecules
Is capable of reacting with any one of the reactants
Can not be recovered chemically unchanged at the end of a chemical reaction
Q.46
Exposure of a photographic plate to produce a latent image is an example of __________ reaction.
Very slow
Very fast
Photochemical
Both B and C
Q.47
An autothermal reactor is
Most suitable for a second order reaction
Most suitable for a reversible reaction
Completely self-supporting in its thermal energy requirements
Isothermal in nature
Q.48
A Catalyst
Increases the equilibrium concentration of the product
Changes the equilibrium constant of the reaction
Shortens the time to reach the equilibrium
None of these
Q.49
A catalyst promoter
Improves the activity of a catalyst
Acts as a catalyst support
Itself has very high activity
All of the above
Q.50
For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - r
A0
is invariant with total pressure. The rate controlling step is
Surface K
c
/(1 + T
S
) reaction between absorbed A and B in the gas phase
Surface reaction between absorbed A and absorbed B
Surface reaction between A in the gas phase and absorbed B
Desorption of C
0 h : 0 m : 1 s
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