Chemical Engineering Gate Yearwise 


Chemical Engineering GATE 2014 Questions with Answer

Ques 1 Chemical Engineering Thermodynamics

From the following list, identify the properties which are equal in both vapour and liquid phases at equilibrium
P. Density
Q. Temperature
R. Chemical potential
S. Enthalpy

A

P and Q only

B

Q and R only

C

R and S only

D

P and S only


Ques 2 Chemical Engineering Thermodynamics

In a closed system, the isentropic expansion of an ideal gas with constant specific heats is represented by

A

B

C

D


Ques 3 Chemical Engineering Thermodynamics

Match the following
Group 1

A

Q-III, R-I, S-II

B

Q-III, R-II, S-IV

C

P-III, R-II, S-IV

D

P-III, R-IV, S-I


Ques 4 Chemical Engineering Thermodynamics

Which ONE of the following is CORRECT for an ideal gas in a closed system?

A

(∂U/∂V)SV=nR(∂U/∂S)V

B

(∂H/∂P)SP=nR(∂H/∂S)P

C

(∂U/∂V)SV=nR(∂H/∂S)P

D

(∂H/∂P)SP=nR(∂U/∂S)V


Ques 5 Chemical Engineering Thermodynamics

Carbon monoxide (CO) is burnt in presence of 200% excess pure oxygen and the flame temperature achieved is 2298 K. The inlet streams are at 25°C. The standard heat of formation (at 25°C) of CO and CO2 are -110 kJ mol-1 and -390 kJ mol-1, respectively. The heat capacities (in J mol-1K-1) of the components are
CPO2=25+14×10-3T
CpCO2=25+42×10-3T
where, T is the temperature in K. The heat loss (in kJ) per mole of CO burnt is

35.0 is the correct answer.


Ques 6 Chemical Engineering Thermodynamics

Consider a binary liquid mixture at equilibrium with its vapour at 25°C. Antoine equation for this system is given as log10pisat=A-B/(t+C) where t is in °C and p in Torr. The Antoine constants (A, B, and C) for the system are given in the following table.

ComponentABC
17.01210230
26.51206223

The vapour phase is assumed to be ideal and the activity coefficients (γi) for the non-ideal liquid phase are given by
ln(γ1)=x22[2-0.6x1]
ln(γ2)=x12[1.7+0.6x2]
If the mole fraction of component 1 in liquid phase (x1) is 0.11, then the mole fraction of component 1 in vapour phase (y1) is

0.70 is the correct answer.


Ques 7 Chemical Reaction Engineering

In order to achieve the same conversion under identical reaction conditions and feed flow rate for a non-autocatalytic reaction of positive order, the volume of an ideal CSTR is

A

always greater than that of an ideal PFR

B

always smaller than that of an ideal PFR

C

same as that of an ideal PFR

D

smaller than that of an ideal PFR only for first order reaction


Ques 8 Chemical Reaction Engineering

The vessel dispersion number for an ideal CSTR is

A

-1

B

0

C

1

D

∞


Ques 9 Chemical Reaction Engineering

A homogeneous reaction -rR=k occurs in a batch reactor. The conversion of the reactant R is 67% after 10 minutes and 80% after 20 minutes. The rate equation for this reaction is

A

-rR=k

B

-rR=k CR2

C

-rR=k CR

D

-rR=k CR0.5


Ques 10 Chemical Reaction Engineering

A vapour phase catalytic reaction (Q+R→S) follows Rideal mechanism (R and S are not adsorbed). Initially, the mixture contains only the reactants in equimolar ratio. The surface reaction step is rate controlling. With constants a and b, the initial rate of reaction (-ro) in terms of total pressure (PT) is given by

A

-ro=(aPT)/(1+bPT)

B

-ro=(aPT)/(1+bPT2)

C

-ro=(aPT2)/(1+bPT)

D

-ro=(aPT2)/((1+bPT)2)


Ques 11 Chemical Technology

Decomposition efficiency (ηD) of an electrolytic cell used for producing NaOH is defined as

A

ηD = (grams of NaOH produced / grams of NaCl decomposed) ×100

B

ηD = (grams of NaOH produced/grams of NaCl charged) ×100

C

ηD = (gram equivalents of NaOH produced / gram equivalents of NaCl charged) ×100

D

ηD = (theoretical current to produce one gram equivalent / actual current to produce one gram equivalent) x 100


Ques 12 Chemical Technology

Catalytic cracking is

A

a hydrogen addition process

B

a carbon rejection process

C

an exothermic process

D

a coking process


Ques 13 Chemical Technology

Which ONE of the following statements is CORRECT?

A

The major components of biodiesel are triglycerides

B

Biodiesel is essentially a mixture of ethyl esters

C

Biodiesel is highly aromatic

D

Biodiesel has a very low aniline point


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