List of top Questions asked in TS PGECET- 2026

For Arrhenius model of the rate constant \( k = k_0 \cdot e^{-E/RT} \), the graph drawn between \( \ln(k) \) versus \( \frac{1}{T} \) gives the slope of:

For a highly exothermic, solid-catalysed reaction, what reactor configuration should be used to achieve high conversion?

The catalyst in a second order reversible reaction increases the rate of the:

A space time of 3 hours for a flow reactor means that:

For all positive reaction orders and for a given reactor duty:

Which one of the following fixes the volume of batch reactor for a particular conversion and production rate?

The molecular diffusivity of a liquid:

The reason for referring packed towers over plate towers in distillation practice is that the packed tower operation gives:

In binary distillation, the number of bubble cap per tray primarily depends on:

In distillation column design, the McCabe-Thiele procedure is inadequate and Ponchon-Savarit procedure is needed when:

In an inter-phase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be:

In an absorber the equilibrium curve is always:

The individual mass transfer coefficients (\(\text{mol}/\text{m}^2\cdot\text{s}\)) for absorption of a solute from a gas mixture into a liquid solvent are \( k_L = 4.5 \) and \( k_G = 1.5 \). The slope of the equilibrium line is 3. Which one of the following resistance(s) is/are controlling?

A batch of material is dried under constant drying conditions. When drying is taking place from all the surfaces, the rate of drying during the constant rate period is:

Which one of the following tray gives greatest flexibility in distillation column?

The dew point of an unsaturated mixture of water vapour and air at constant temperature and pressure:

An azeotropic mixture of two liquids has boiling point higher than either of them when it:

If there is condensation of carrier steam in the steam distillation of high-boiling organic materials, then:

For laminar film condensation on vertical surface, the film thickness:

If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid:

The Sieder-Tate correlation for heat transfer in turbulent flow in a pipe gives \( \text{Nu} \propto \text{Re}^{0.8} \), where Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer coefficient varies with the pipe diameter (D) as:

Prandtl number in heat transfer is analogous to the following dimensionless number in mass transfer:

Unsaturated air (with dry bulb temperature and dew point being \( 35^\circ\text{C} \) and \( 18^\circ\text{C} \) respectively) is passed through a water spray chamber maintained at \( 15^\circ\text{C} \). The air will be:

Which one of the following forms minimum boiling azeotrope at one atmosphere?

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are \( k_A \) and \( k_B \) and the specific heat capacities are \( C_{pA} \) and \( C_{pB} \), for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B when: