Chemical Engineering Gate 2018 Questions with Answer

Ques 1 GATE 2018

Liquid phase isomerization of o-xylene to p-xylene using a zeolite catalyst was carried out in a CSTR. Three sets of kinetic data at different temperatures and stirring speeds were obtained as shown below.

Ques 2 GATE 2018

The reactant (M) is converted into product (N) in the presence of catalyst in a fixed bed reactor. All the flow rates (F, G, H, P and R) in mol/s, and mole fraction of reactant (M) in these streams (xF, xG, xH, xP and xR) are shown in the diagram.

Ques 3 GATE 2018

For a chemical reaction, the ratio of rate constant at 500 K to that at 400 K is 2.5. Given R = 8.314 J mol^-1 K^-1, the value of activation energy (in kJ/mol) is

Ques 4 GATE 2018

The ammonia (NH₃) oxidation process occurs over a catalyst as:
4 NH₃ + 5 O₂ → 4 NO + 6 H₂O
Air is supplied such that oxygen (O₂) is 20% in excess of that required for complete conversion of NH₃.
The mole fraction of O₂ in the inlet gas mixture (NH₃ + air) is ______ (rounded off to third decimal place).

Ques 5 GATE 2018

In a laboratory batch setup, reaction of P over a catalyst was studied at various temperatures.
The reactions occurring are:
P → 2Q
P → R

At the end of one hour of operation, the batch contains x_P, x_Q, and x_R mole fractions of P, Q, and R components, respectively.
The mole fractions of product components (x_Q and x_R) were found to vary linearly with temperature as given in the figure.

Ques 6 GATE 2018

A CSTR and a PFR of equal volume are connected in series as shown below to carry out a first-order, isothermal, liquid phase reaction

Ques 7 GATE 2018

The elementary second-order liquid phase reaction A + B → C + D is carried out in an isothermal plug flow reactor of 2 m³ volume. The inlet volumetric flow rate is 10 m³/h. The initial concentrations of both A and B are 2 kmol/m³. The rate constant is given as 2.5 m³ kmol^-1 h^-1. The percentage conversion of A is ____________.

Ques 8 GATE 2018

A set of standard stainless steel pipes, each of internal diameter 26.65 mm and 6000 mm length, is used to make a plug flow reactor by joining them in series to carry out degradation of polyethylene. Seven such pipes are required to obtain a conversion of 66% at 450 K. The minimum number of standard 8000 mm long pipes of the same internal diameter to be procured for obtaining at least 66% conversion under the same reaction conditions is ___________.

Ques 9 GATE 2018

Hydrogenation of benzene is to be carried out using Ni (density = 8910 kg/m³) as catalyst, cast in the form of non-porous hollow cylinders, as shown below. The reaction occurs on all the surfaces of the hollow cylinder. During an experiment, one such cylinder is suspended in the reactant stream. If the observed rate of reaction is 0.39 mol (m² of catalyst surface)^-1 min^-1, then the rate of reaction in mol (kg of catalyst)^-1 min^-1 is _____________ (rounded off to three decimal places).

Ques 10 GATE 2018

In connection with petroleum refining, identify the incorrect statement among the following options.

Ques 11 GATE 2018

Polyvinyl chloride is produced by

Ques 12 GATE 2018

The molecular formula of the predominant chemical compound in commercial sugar is

Ques 13 GATE 2018

Choose the correct statement
In viscose rayon manufacturing process,