CRE section 1

Question 1

give maximum gas conversion

Answer 1

semi-fluidised bed reactor

Question 2

mechanism of catalysis

Answer 2

activated complex theory

Question 3

not an exothermic process

Answer 3

catalytic cracking

Question 4

fractional volume change of the system for isothermal gas phase

Answer 4

2

Question 5

catalyst

Answer 5

lowers the activation energy

Question 6

order of chemical rxn, if the rate increases by a factor of 2.82 on doubling the conc of A

Answer 6

7/2

Question 7

high conversion in highly exothermic solid catalyzed reactions

Answer 7

fluidised bed followed by fixed

Question 8

for every 10C rise in temp

Answer 8

16

Question 9

single parameter model proposed for describing non ideal flow

Answer 9

both a and b
tank in series and dispersion

Question 10

first order requires two equal size cstr, conversion is

Answer 10

more when they are in series

Question 11

physical adsorption, heat of adsorption is order of

Answer 11

1000

Question 12

unsuitable reactor for carrying high reactant

Answer 12

backmix reactor

Question 13

wrong statement

Answer 13

space velocity of 3 hr means that one third of

Question 14

reactor termed as autoclave when

Answer 14

high pressure batch reactor

Question 15

6 gm carbon is burnt with air with 18gm oxygen

Answer 15

95%

Question 16

rate constant decrease by decreasing the

Answer 16

temperature

Question 17

rxn rate for the rxn, if S at is present in large excess

Answer 17

one

Question 18

rate if gaseous ohase rxn, the unit of rate constant is

Answer 18

atm-1.hr-1

Question 19

response curve for a step inout signal from reactor

Answer 19

S-curve

Question 20

‘Knudsen diffusivity’ affected by

Answer 20

temperature

Question 21

suitable for very high pressure gas phase rxn

Answer 21

tubular flow reactor

Question 22

rxn between oxygen and organic material

Answer 22

exothermic

Question 23

decrease in temp, the equilibrium conversion of a reversible endothermic rxn

Answer 23

decreases

Question 24

in exothermic, the reqctant compared to products have

Answer 24

more energy

Question 25

for a rxn type, the rate of rxn (-rx) is given by

Answer 25

K1CV - K2CX

Question 26

in a consecutive rxn system, when E1 is much greater than E2, the yield of B increases with

Answer 26

increase of temperature

Question 27

for minimun reqctor volune, it should be operated such that the temperature along the length

Answer 27

at the highest alowable temp

Question 28

rate constant of a chemical rxn increases by 100 times when temp increased from 400 to 500, value of E/R is

Answer 28

9210

Question 29

batch reactor is suitable for

Answer 29

liquid phase rxn

Question 30

for a heterogeneous catalytic rxn,

Answer 30

free energy of activation is lowered in the presence of catalyst

Question 31

increase in the rate of rxn with temperature is due to

Answer 31

decrease in activation energy

Question 32

catalyst loses its activity due to

Answer 32

all abc loss surface area, agglomeration, covering

Question 33

'N' PFR in series with a total volume V gives same conversion as single PFR of volume V for

Answer 33

any order rxn

Question 34

specific rate constant for a second order

Answer 34

both b and c varies with temp, depends on reactants

Question 35

for the irreversible elementary rxn in parallel, the rate of disappearance is equal to

Answer 35

CA (K1+K2)

Question 36

for an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible rxn

Answer 36

Cao/(1+eAXA)(dXA/dt) = k

Question 37

for a zero order chemical rxn,

Answer 37

all abc

Question 38

BET apparatus

Answer 38

none of these

Question 39

radioactive decays follow

Answer 39

first order

Question 40

excess energy of reactants in a chemical rxn required to dissociate into product is

Answer 40

activation energy

Question 41

the effectiveness of a solid catalyst depends upon the

Answer 41

chemical adsorption

Question 42

pick the correct statement

Answer 42

a catalyst lowers the activation energy

Question 43

3A -> B, rxn order

Answer 43

2

Question 44

pick the correct statement

Answer 44

reactions with high activation energy are temp sensitive

Question 45

if the time required to complete a definite fraction kf rxn varies inversely as the concentration of the reactants, order of rxn is

Answer 45

2

Question 46

sulohuric acid is used as catalyst in

Answer 46

alkylation of hydrocarbons

Question 47

fractional conversion _____ with increase in oressure for ammonia

Answer 47

increases

Question 48

pick the wrong statement

Answer 48

mixed reactors always smaller than the plug

Question 49

why catalyst increases the rate of rxn

Answer 49

it decreases the energy barrier for rxn

Question 50

a first order irreversi rxn, A -> B is carried out separately in a constant volume as wll as in a variable volume reqctor for a particular period. it signifies that

Answer 50

conversiin in bith will be the same but concentrations will be different