List of top Questions asked in TS PGECET- 2026

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?

The molecular diffusivity of a liquid:

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

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:

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:

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 \( \text{Nu} \) is the Nusselt number and \( \text{Re} \) 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:

In a feed forward multiple effect evaporator unit

Baffles in the shell side of a shell and tube heat exchanger

The thermal conductivity is minimum for

In a heat exchanger, floating head is provided to

LMTD for counter flow and parallel flow heat exchanger will be the same, when

For a blackbody, the wavelength at which the maximum monochromatic emissive power occurs is

The most efficient equipment for removal of sub-micron dust particles from blast furnace gas is