Schmidt number and Lewis number for pure air at atmospheric conditions are respectively (A) < 1 and ≈ 1 (B) 1 and 0 (C) > 1 and ≈ 1 (D) 0 and ≈ 1

Schmidt number and Lewis number for pure air at atmospheric
conditions are respectively
(A) < 1 and ≈ 1
(B) 1 and 0
(C) > 1 and ≈ 1
(D) 0 and ≈ 1
by

1 Answer

Answer :

(A) < 1 and ≈ 1
by

Related questions

Which of the following plays an important role in problems of simultaneous heat and mass transfer?(A) Lewis number (B) Schmidt number (C) Prandtl number (D) Sherwood number

Description : Which of the following plays an important role in problems of simultaneous heat and mass transfer (A) Lewis number (B) Schmidt number (C) Prandtl number (D) Sherwood number

Last Answer : (A) Lewis number

Pick out the wrong statement. (A) The Reynolds analogy for mass transfer is given by Lewis relation and is applicable, when Schmidt number is one (B) Sherwood number for flow in pipes can be expressed as the ratio of the concentration gradient at wall to the overall concentration difference (C) According to film theory for equimolar counter diffusion, the mass transfer coefficient is given by DAB(B)P - 3, Q - 2 (D) The z-component of the total mass flux of a component A in binary mixture of A and B is given by - Dab'.dCA/dz

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Last Answer : (C) According to film theory for equimolar counter diffusion, the mass transfer coefficient is given by DAB(B)P - 3, Q - 2

Which is not concerned directly with mass transfer? (A) Schmidt number (B) Sherwood number (C) Lewis relationship (D) Froude number

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Last Answer : (D) Froude number

The histogram above represents the lifespan of a random sample of a particular type of insect. Determine the relationship between the mean and median. a. mean = median b. mean ≈ median c. mean < median d. mean > median

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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

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Last Answer : (A) Water has a high latent heat of evaporation

At 750°K and 1 atm, the approximate value of Schmidt number for air is (A) 0.01 (B) 0.1 (C) 1 (D) 10

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Last Answer : (B) 0.1

“The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is (A) The statement as per Gibbs-Helmholtz (B) Called Lewis-Randall rule (C) Henry's law (D) None of these

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The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around (A) 1 (B) 0.24

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Last Answer : (D) Relative saturation of unsaturated mixture of water vapor & air cannot be increased by either reducing the mixture temperature or by increasing the total pressure

In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) (A) 6.89 (B) 8.89 (C) 10 (D) 8.25

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In a mixer, the quantity, (v. L/D) is termed as __________ number (where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing). (A) Weber (B) Peclet (C) Brinkman (D) Schmidt

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Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number. (A) Schmidt (B) Sherwood (C) Peclet (D) Stanton

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Last Answer : (A) µ/ρDAB

Pick out the wrong statement. (A) In the McCabe-Thiele diagram for binary distillation, vertical feed line represents saturated liquid feed and horizontal feed line represents saturated vapour feed (B) In small columns, local efficiency is larger than Murphree efficiency; in large columns local efficiency is smaller than Murphree efficiency (C) For Laminar flow over a plate of length L, the local mass transfer co￾efficient at a distance L from the leading edge is 1.5 × 10 -2m/s. Then the average mass transfer co-efficient for the plate is 2 × 10 -2m/s (D) The concentration and hydrodynamic boundary layers over a flat plate are of equal thickness, if Schmidt number is equal to unity

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Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number. (A) Sherwood (B) Schmidt (C) Peclet (D) Stanton

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Last Answer : (A) Sherwood

In physical terms, Schmidt number means (A) Thermal diffusivity/mass diffusivity(B) Thermal diffusivity/momentum diffusivity(C) Momentum diffusivity/mass diffusivity(D) Mass diffusivity/thermal diffusivity

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The Schmidt number which is defined as, μ/ρ D, is the ratio of the (A) Momentum diffusivity to the mass diffusivity (B) Thermal diffusivity to the mass diffusivity (C) Momentum diffusivity to the thermal diffusivity (D) None of these

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Which of the following is not concerned with the heat transfer? (A) Brinkman number (B) Stanton number(C) Schmidt number(D) Peclet number

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. If Prandtl number is greater than the Schmidt number, then the (A) Thermal boundary layer lies inside the concentration boundary layer (B) Concentration boundary layer lies inside the thermal boundary layer (C) Thermal & concentration boundary layers are of equal thickness (D) Hydrodynamic (i.e., momentum) boundary layer is thicker than the other two

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The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is (A) Nusselt number (B) Sherwood number (C) Schmidt number (D) Stanton numbe

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The non-dimensional temperature gradient in a liquid at the wall of a pipe is the (A) Heat flux (B) Nusselt number (C) Prandtl number (D) Schmidt number

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The hydrodynamic and thermal boundary layers will merge, when (A) Prandtl number is one (B) Schmidt number tends to infinity (C) Nusselt number tends to infinity (D) Archimedes number is greater than 10000

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The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are: (A) 1 (B) 2 (C) 3 (D) 0

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Last Answer : (B) 2

Pick out the wrong statement. (A) The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are the same for NSc = NPr= 1 (B) 1 Nm3 of dry air is lighter than 1Nm3 of humid air (C) The Lewis number of a mixture is unity, when the thermal diffusivity is equal to the mass diffusivity

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Last Answer : (B) 1 Nm3 of dry air is lighter than 1Nm3 of humid air

Standard air is the: a. Mass of 1 cubic meter of dry air at 20°C and atmospheric pressure b. Mass of a cubic meter of air at atmospheric conditions c. Volume of air at ambient temperature and atmospheric pressure d. Volume of 1 kg of dry air at 21°C and atmospheric pressure at sea level or 101.325 kPa e. Volume of 1 kg of air at 15°C and 100 kPa

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Last Answer : Answer: D

Which one of the following statements is correct ? a) For water at 100o Celsius at sea level, the vapour pressure is equal to atmospheric pressure b) Surface energy (or tension) is caused by the force of adhesion between liquid molecules c) Viscosity of a fluid is the property exhibited by it both in static and in dynamic conditions d) Air is 50,000 times more compressible than water

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n a chemical factory where dyes are made, wet cake at 30 OC consisting of 60% moisture is put in a dryer to obtain an output having only 5% moisture, at atmospheric pressure. In each batch about 120 kgs of material is dried. a. The quantity of moisture removed per batch. b. What is the total quantity ( sensible & latent) of heat required to evaporate the moisture, if the latent heat of water is 540 kcal/kg at atmospheric conditions, Ignore heat absorbed by the solids c. Find the quantity of steam required for the drying process (per batch), if steam at 4 kg/cm2 is used for generating hot air in the dryer and the dryer efficiency is 80%. Latent heat of steam at 4 kg/cm2 is 520 kcal/kg.

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Last Answer : Given that   Qty of material dried per batch - 120 Kgs  Moisture at inlet - 60% a. The quantity of moisture removed per batch.  Water quantity in a wet batch - 120 x 0.6 = 72 Kgs.  Quantity of bone dry ... - 48/0.95 = 50.5 Kgs.  Equivalent water in a dry batch - 50.5 - 48 = 2.5 Kgs.

For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd , then (A) hf = hd (B) hf > hd (C) hf < hd (D) hf could be greater or smaller than hd

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Last Answer : (C) hf < hd

If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is (A) 0 (B) 1 (C) < 1 (D) > 1

Description : If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is (A) 0 (B) 1 (C) < 1 (D) > 1

Last Answer : (B) 1

ECE Board Exam March 1996 The K-factor under normal atmospheric conditions in a microwave radio data profile calculation is equal to ___________. A. 2/3 B. 0 C. 4/3 D. Infinity

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The binary diffusivity in gases at atmospheric conditions is about (A) 10 -9 cm/sec (B) 10 -1 cm2 /sec (C) 10 -3 sec/cm (D) 10 -4 cm2 /sec

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Last Answer : (B) 10 -1 cm2 /sec

Natural radioactivity was discovered by a)Schmidt b)Curie c)Becquerel d)Rutherford

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What is the Schmidt Pain Index?

Description : What is the Schmidt Pain Index?

Last Answer : The Schmidt pain index is a scale intended to gauge the pain from the stings of wasps, bees, and ants. It was developed by entomologist Justin Schmidt, who intentionally sustained dozens of insect ... is commendable, his colorful descriptions of insect stings should be taken with a grain of salt.

What is the name of A.J. Schmidt aka Troy West?

Description : What is the name of A.J. Schmidt aka Troy West?

Last Answer : His name is Hudson from Fratmen

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Last Answer : In Five Nights at Freddy's, Mike Schmidt's occupation is a security guard. To add, Five Nights at Freddy's: Sister Location is a point-and-click survival Horror video game created by Scott Cawthon. It is the fifth game in the Five Nights at Freddy's series

The Milky Way Galaxy was first observed by – (1) Galileo (2) Maarten Schmidt (3) Marconi (4) Newton

Description : The Milky Way Galaxy was first observed by – (1) Galileo (2) Maarten Schmidt (3) Marconi (4) Newton

Last Answer : (1) Galileo Explanation: The Milky Way is the galaxy that contains our solar system. This name derives from its appearance as a dim "milky" glowing band arching across the night sky, in ... came when Galileo pointed his telescope towards the Milky Way, observing a large amount of faint stars.

What for Schmidt plot for is used in heat transfer problems ?

Description : What for Schmidt plot for is used in heat transfer problems ?

Last Answer : Schmidt plot is a graphical method for determining the temperature at any point in a body at a specified time during the transient heating or cooling period.

If concrete compression test fails, should Schmidt hammer test be adopted as an alternative test to prove the concrete strength?

Description : If concrete compression test fails, should Schmidt hammer test be adopted as an alternative test to prove the concrete strength?

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Which of the following reactions is suitable for the preparation of α-amino acids? (a) Schmidt reaction (b) Hofmann's degradation of amides (c) Strecker's synthesis (b) Reduction of nitro compounds

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Tannenbaum and Schmidt‟s continuum of possible leadership behaviour identifies four main styles of leadership by the manager. What are they? (a) Commands, helps, joins and leads ; (b) Tells, sells, consults and joins (c) Tells, helps, joins and leads ; (d) Commands, sells, consults and resists

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The Nobel Prize for Chemistry for the year 2011 has been awarded to (1) Saul Perlmutter, Brian P. Schmidt and Adam G. Riess (2) Bruce A. Beutler, Jules A. Hoffmann and Ralph M. Steinman (3) Christopher A. Sims and Thomas J. Sargent (4) Dan Schechtman

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Last Answer : Dan Schechtman

The Nobel Prize for Physics for the year 2011 has been awarded to (1) Saul Perlmutter, Brian P. Schmidt and Adam G. Riess (2) Bruce A. Beutler, Jules A. Hoffmann and Ralph M. Steinman (3) Christopher A. Sims and Thomas J. Sargent (4) Dan Schechtman

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Last Answer :  Saul Perlmutter, Brian P. Schmidt and Adam G. Riess

The Milky Way Galaxy was first observed by (1) Galileo (2) Maarten Schmidt (3) Marconi (4) Newton

Description : The Milky Way Galaxy was first observed by (1) Galileo (2) Maarten Schmidt (3) Marconi (4) Newton

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Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin /yout ).For 98% recovery of acetone, the number of trays required is/are: (A) 4 (B) 8 (C) 9 (D) 10

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Last Answer : (C) 9

For vaporization of water at 1 atmospheric pressure the values of `DeltaH` and `DeltaS` are `40.63KJmol^(-1)` and `108JK^(-1)mol^(-1)` , respectively.

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Last Answer : (B) 3.76

There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km. (A) 0.05 (B) 1 (C) 6.5 (D) 15

Description : There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called ... is about __________ °C/km. (A) 0.05 (B) 1 (C) 6.5 (D) 15

Last Answer : (C) 6.5