Description : Explain the factors which affect the rate of evaporation of a liquid.
Last Answer : Factors affecting rate of evaporation: 1. Temperature: The rate of evaporation is directly proportional to the temperature of liquid. The evaporation can be accelerated by increasing the temp ... : The rate of evaporation is directly proportional to the vapour pressure of evaporating liquid.
Description : Describe the factors which affect rate of the evaporation of liquid
Last Answer : Factors affecting evaporation: 1)Temperature: The rate of evaporation is directly proportional to temp of liquid. 2)Temperature and time of evaporation: It has been observed that exposure to ... : The rate of evaporation is directly proportional to the vapour pressure of the evaporating liquid.
Description : During the constant rate period of drying of a solid, (A) Increased air humidity decreases the rate of drying (B) Increasing the air temperature decreases the drying rate (C) Surface evaporation of unbound moisture occurs (D) None of these
Last Answer : (C) Surface evaporation of unbound moisture occurs
Description : Pick out the wrong statement. (A) In case of heat transfer by purely forced convection, GR /Re 2 ≤ 1 (B) The equivalent diameter of heat transfer for a duct of ... nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface
Last Answer : (B) The equivalent diameter of heat transfer for a duct of square crosssection (having each side as 'x') is equal to 4x
Description : Explain the factors affecting evaporation of a liquid.
Last Answer : Factor affecting evaporation 1. Temperature: The rate of evaporation is directly proportional to the temperature of the liquid. The evaporation can be accelerated by increasing the temperature but it ... of evaporation is maximum at its boiling point when the liquid has maximum vapour pressure.
Description : For calculating the evaporation rate over a reservoir surface E = 0.771 (1.465 - 0.00732B) (0.44 - 0.007375 V) (pe - pa), the equation is given by (A) Roohwer's, formula in M.K.S. (B) Roohwer's formula in F.P.S. (C) Dalton's formula in F.P.S. (D) Dalton's formula in M.K.S
Last Answer : Answer: Option A
Description : Rate of cooling depends on the (1) Temperature difference between the body and the surroundings (2) Nature of the radiating surface (3) Area of the radiating surface (4) All of these
Last Answer : (4) All of these Explanation: Newton's Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the ... Specific heat of the radiating body; Temperature of radiating body and ♦ Temperature of the surrounding.
Last Answer : All of these
Description : In a counter-current liquid extractor (A) Both liquids flow at fixed rate (B) Both liquids can have any desired flow rate (C) Only one of the liquids may be pumped at any desired rate (D) Liquid’s flow rate depends upon the temperature and pressure
Last Answer : (C) Only one of the liquids may be pumped at any desired rate
Description : Leidenfrost point is a term concerned with the (A) Condensation of the saturated vapor on a cold surface (B) Concentration of a corrosive solution by evaporation (C) Heat transfer between two highly viscous liquids (D) Boiling of a liquid on a hot surface
Last Answer : (D) Boiling of a liquid on a hot surface
Description : The thickness of condensate layer in filmwise condensation depends on the (A) Condensation rate (B) Surface configuration (C) Liquid flow rate from the surface (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : What are the factors affecting evaporation? Explain how rate of evaporation affects by them. -Maths 9th
Last Answer : Factors That Affect the Rate of Evaporationtemperature of the liquid. A cup of hot water will evaporate more quickly than a cup of cold water.exposed surface area of the liquid. ...presence or ... substances in the liquid. ...air movement. ...concentration of the evaporating substance in the air.
Description : What Are The Factors That Affect The Rate Of Evaporation Of Water In Cooling Towers?
Last Answer : Amount of water surface area exposed. The time of exposure. The relative velocity of air passing over the droplets. The RH of air. The direction of airflow relative to water.
Description : Define evaporation. Explain any four factors affecting rate of evaporation.
Last Answer : Definition: Evaporation is the free escape of vapour from the surface of a liquid bellow its boiling point. Factors affecting rate of evaporation: 1. Temperature: The rate of evaporation is ... The rate of evaporation is maximum at its boiling point when the liquid has maximum vapour pressure.
Description : Why does a liquids evaporation rate increases when liquid is heated?
Last Answer : More molecules have enough energy to overcome the attractiveforces holding them in the liquid.
Description : In case of evaporators, liquid entrainment results primarily due to (A) High vacuum in the evaporator (B) High evaporation rate (C) Foaming of the solution (D) High heat transfer rate
Last Answer : (C) Foaming of the solution
Description : The surface of water in a pond remains cool even on a hot day because 1. water evaporates at the surface and evaporation causes cooling 2. the heat absorbed at the surface is transmitted downwards 3. Water in contact with the bottom ... /are correct? (a) 1 only (b) 3 only (c) 1 and 3 (d) 1, 2 and 3
Last Answer : Ans:(a)
Description : The actual temperature drop across the heating surface in an evaporator depends on the (A) Feed (B) Depth of liquid over heating surface (C) Pressure difference between steam chest and vapour space (D) All (A), (B) and (C)
Description : The actual temperature drop across the heating surface of an evaporator depends on the (A) Liquid depth over the heating surface (B) Solution being evaporated (C) Pressure difference between the steam chest and the vapor space above the boiling liquid (D) All (A), (B) and (C)
Description : On average, how do low clouds affect the surface temperature (compared to a clear sky)? (a) Low clouds warm the surface by increasing the greenhouse effect (b) Low clouds cool the surface by ... surface by increasing the albedo (d) It depends on whether they are comprised of ice or liquid water
Last Answer : (c) Low clouds cool the surface by increasing the albedo
Description : On average, how do high clouds affect the surface temperature (compared to a clear sky)? (a) High clouds warm the surface by increasing the greenhouse effect (b) High clouds cool the surface ... surface by increasing the albedo (d) It depends on whether they are comprised of ice or liquid water
Last Answer : High clouds warm the surface by increasing the greenhouse effect
Description : The rate at which dissolution occurs is LEAST dependent upon which one of the following factors: w) temperature x) pressure y) solution concentration z) solute surface area
Last Answer : ANSWER: X -- PRESSURE
Description : The burnout heat flux in the nucleate boiling regime is not a function of the (A) Liquid density (B) Vapour density (C) Temperature difference (D) Heat of evaporation
Last Answer : (B) Vapour density
Description : Which of the following situations can be approximated to a steady state heat transfer system? (A) A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmospheric air at ... flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C
Last Answer : (B) 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C
Description : In the constant rate period of the rate of drying curve for batch drying, (A) Cracks develop on the surface of the solid (B) Rate of drying decreases abruptly (C) Surface evaporation of unbound moisture occurs (D) None of these
Description : Fog that most often forms as warm rain falls into a cold layer of surface air is called -------? A. Radiation fog B. Evaporation (mixing) fog (Answer) C. Advection fog D. Upslope fog
Last Answer : B. Evaporation (mixing) fog (Answer)
Description : The optimum percentage of excess air for combustion depends upon the__________ of the fuel. (A) Type (solid, liquid or gaseous) (B) Calorific value (C) Sulphur content (D) Ignition temperature
Last Answer : (A) Type (solid, liquid or gaseous)
Description : Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates ... (except the first one) is involved in each of the evaporation process (D) None of these
Last Answer : (B) There is no dynamic equilibrium between successive layer
Description : Evaporation losses depend upon (A) Area of the water surface and depth of the water (B) Nature of precipitation and type of vegetation (C) Humidity and wind velocity (D) All the above
Last Answer : Answer: Option D
Description : Consider the diurnal (daily) cycle of temperature at the surface. Why is the tem- perature maximum in the mid-to-late afternoon? (a) There is a net energy gain at the surface from dawn to mid- ... this time. (d) Late in the day, evaporation from the surface increases and this cools the surface.
Last Answer : There is a net energy gain at the surface from dawn to mid- afternoon.
Description : Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature. (A) Less than (B) More than (C) Equal to (D) Either (A) or (B); depends on the solid
Last Answer : (A) Less than
Description : Black liquor is converted into white liquor by (A) Evaporation and burning the concentrate followed by causticisation of products (B) Multi-effect evaporation only (C) Selective liquid extraction (D) Extractive distillation
Last Answer : (A) Evaporation and burning the concentrate followed by causticisation of products
Description : Sele(A) The discharge through a Venturimeter depends upon Δp only and isindependent of orientation of the meterct the correct statement. (B) A Venturimeter with a given gage difference discharges at a ... a given pipe line, whether a Venturimeter or a nozzle with the same throat dia is used
Last Answer : (A) The discharge through a Venturimeter depends upon Δp only and isindependent of orientation of the meterct the correct statement
Description : Select the correct statement. (A) The discharge through a Venturimeter depends upon Δp only and isindependent of orientation of the meter (B) A Venturimeter with a given gage difference discharges at a ... a given pipe line, whether a Venturimeter or a nozzle with the same throat dia is used
Last Answer : (A) The discharge through a Venturimeter depends upon Δp only and isindependent of orientation of the meter
Description : When the rate of evaporation of water is zero, the relative humidity of the air is A. 0% B. 100% C. 50% D. unpredictable
Last Answer : ANSWER : B
Description : If the temperature of a place is increasing, then the rate of evaporation at that place -Science
Last Answer : will increase
Description : Rate of evaporation of petrol is greater than that of water at room temperature because: A. petrol molecules do not have any hydrogen bond (Answer) B. petrol is an organic compound C. water molecules have small size D. petrol molecules have greater size
Last Answer : A. petrol molecules do not have any hydrogen bond (Answer)
Description : The heating capacity of muffle furnace depends on the (A) Surface area & emissivity of the stock (B) Properties of the muffle wall (temperature, area, and emissivity) (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : The heating capacity of continuous reheating furnace depends upon the (A) Hearth area and furnace temperature (B) Emissivity of the stock (C) Ratio of wall surface to stock surface (D) All (A), (B) and (C)
Description : Wavelength of radiation emitted by a body depends on the __________ of its surface. (A) Temperature (B) Area (C) Nature (D) All 'a', 'b' & 'c'
Last Answer : Option
Description : For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because (A) Water has a high latent heat of evaporation (B) Lewis number is close to unity (C) They are always equal under all circumstances
Last Answer : (A) Water has a high latent heat of evaporation
Description : Evaporation from water surfaces exposed to air is not dependent of the: w) velocity of the wind x) humidity y) temperature z) depth of the water
Last Answer : ANSWER: Z -- DEPTH OF THE WATER
Description : Pressure exerted by a liquid depends upon its (A) Surface tension (B) Density (C) Viscosity
Last Answer : Option B
Description : The angle of contact in case of a liquid depends upon (A) The nature of the liquid and the solid (B) The material which exists above the free surface of the liquid (C) Both of die above (D) Any one of the above
Last Answer : Answer: Option C
Description : Size of the combustion chamber of a furnace depends upon the (A) Heat release rate of the fuel (B) Preheat temperature of fuel & air (C) Method of mixing the fuel & air (D) All (A), (B) and (C)
Description : In summer, man with excess perspiration feels weak, because of the (a) Loss of more water through evaporation (b) Loss of salts through evaporation (c) Loss of carbohydrates through evaporation (d) All factors mentioned above
Last Answer : Ans:(d)
Description : Discuss factors affecting evaporation.
Last Answer : Factors affecting evaporation: 1) Temperature: The rate of evaporation is directly proportional to temp of liquid. 2) Temperature and time of evaporation: It has been observed that exposure ... : The rate of evaporation is directly proportional to the vapour pressure of the evaporating liquid.
Description : Define evaporation and explain any four factors affecting evaporation.
Last Answer : Definition: Evaporation is the free escape of vapour from the surface of a liquid bellow its boiling point. Factors affecting evaporation: 1) Temperature: The rate of evaporation ... evaporated: The rate of evaporation is directly proportional to the vapour pressure of the evaporating liquid
Description : For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would (A) Decrease (B) Increase (C) First decrease and then increase (D) First increase and then decrease
Last Answer : (D) First increase and then decrease
Description : Which one of the following statements is correct with respect to kidney function regulation? (a) When someone drinks lot of water, ADH release is suppressed. (b) Exposure to cold temperature ... During summer when body loses lot of water by evaporation, the release of ADH is suppressed.
Last Answer : (a) When someone drinks lot of water, ADH release is suppressed.