List of top Questions asked in AP PGECET- 2026

In liquid-liquid extraction, the distribution coefficient D is defined as:
In adsorption, the Langmuir isotherm assumes:
The McCabe-Thiele method for distillation is valid, when______
Moisture contained by a substance in excess of equilibrium moisture is called______
Milk powder is made from milk by drying in a:
The temperature at which a vapor-gas mixture becomes saturated when cooled at constant total pressure out of contact with a liquid is called:
In a binary gas mixture at low pressures, the diffusion coefficient is ______
The diffusivity of A in B is 2x10$^{-5}$ m$^2$/s. For a stagnant film of thickness 2mm with C$_{A1}$ = 0.05 mol/m$^3$ and C$_{A2}$ = 0.01 mol/m$^3$, the molar flux is ______
Heat energy required to increase the temperature of unit mass of gas and its accompanying vapour by one degree at constant pressure is known as______
According to penetration theory, the mass transfer coefficient is proportional to______
Psychrometric ratio for air-water mixture over the temperature usually come across is approximately______
For condensation of a pure vapor on a vertical surface, the Nusselt theory predicts:
The heat flux (from outside to inside) across an insulating wall with thermal conductivity k = 0.04 W/m K and thickness 0.16m is 10 W/ m$^2$. The temperature of the inside wall is -5$^\circ$C. The outside wall temperature is______ $^\circ$C.
The hydrodynamic and thermal boundary layer will merge, when______
Prandtl number is the ratio of ______
The thermal conductivity is minimum for ______
Which of the following dimensionless number is associated with free convection?
Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature is known as ______
In a counter-current heat exchanger, compared to co-current flow:
In natural convection, the driving force for fluid motion is:
At steady state the temperature profile in a laminated system appears as in figure. What is the thermal conductivity of material 2 if steady state flux is 12.6$\times$10$^3$ W/m$^2$ and conductivity of material 1 is 52 W/mK ?
A sphere of radius R is in motionless fluid (no forced or natural convection). The surface temperature of the sphere is T$_R$ and the bulk temperature T$_\infty$. What is the Nusselt number for this situation?
Screen efficiency in size separation depends on:
In a cyclone separator, particles are separated due to:
Shell balance in fluid mechanics is used to derive: