A. The partial pressure of water vapour increases
B. The specific humidity decreases
C. The relative humidity increases
D. The relative humidity decreases
Correct Answer: The relative humidity decreases ✔
Last Updated: February 15, 2019
Related MCQs
- Danckwerts developed the __________ theory?
- Leaching of coarse solid lumps is also termed as __________?
- Steam distillation is used to__________?
- Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?
- In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as __________ ?
- Rayleigh equation applies to __________ distillation ?
- What is the degree of freedom of an absorption process in which only one component is transferred between phases ?
- Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?
- At 750°K and 1 atm, the approximate value of Schmidt number for air is__________?
- For water-ethanol system, the minimum reflux ratio__________?
- Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as__________?
- Which one of the following devices is not used for both the absorption as well as the liquidliquid extraction processes ?
- Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to that of component ‘B’, when__________?
- Calculation of mass transfer co-efficient is mostly/normally done using __________ theory?
- With increase in temperature, the leaching rate increases because of the __________?
- For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be __________?
- Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture ?
- The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the__________?
- Swenson-Walker crystalliser is a __________ unit ?
- A 25 cm × 25 cm × 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m × 1m × 1cm flat sheet of the same material is to be dried from one side only. Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is __________?
- Henry’s law states that the __________?
- Desulphurisation of petrol is done in a __________?
- Pressure drop through plate tower as compared to that through packed tower, for the same duty will be__________?
- For gas absorption, low viscosity solvents are preferred, because of their __________?
- Which of the following increases during evaporative cooling process with recirculated water supply ?
- Drying of a solid involves __________ transfer ?
- In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero?
- Which of the following is used for the concentration of rubber latex ?
- Operating velocity in a packed tower is usually __________ the flooding velocity ?
- For stripping of a gas in a counter current stripper, the operating line __________?
- In gas-liquid contact operation, the number of ideal stages, N = (xa – xb)/(xb – x*b). This is true when the stripping factor ‘S’ is __________?
- The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is__________?
- Large scale usage of flash distillation is practised in __________?
- The boiling points of pure components of a binary system __________ with increase in total pressure of the system ?
- During sensible cooling process __________?
- The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if__________?
- Pick out the wrong statement ?
- In triangular co-ordinates, the ternary composition point falls __________ of the triangle?
- Co-current absorbers are usually used when the gas to be dissolved in the liquid is __________?
- When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system ?
- Molecular sieves are regenerated by heating to __________ °C?
- Pick out the wrong statement. Generally for physical adsorption, a gas of__________?
- Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C ?
- Which of the following is not fixed by the process requirements, in the design of absorbers ?
- Reboiler is considered as one theoretical plate, because__________?
- With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________, if the conduction and radiation through the solid are negligible ?
- Large scale drying of wheat is done in a __________ dryer?
- With increase in temperature, the leaching rate increases due to__________?
- In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed__________?
- Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption?
- In an absorption column, the flooding velocity for random packing is __________ that for stacked/regular packing?