Description : Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as (A) K ∝ D (B) K ∝√D (C) K ∝ D1.5 (D) K ∝ D
Last Answer : (A) K ∝ D
Description : Rate constant 'k' and absolute temperature 'T' are related by collision theory (for bimolecular) as (A) k ∝ T 1.5 (B) k ∝ exp(-E/RT) (C) k ∝ √T (D) k ∝ T
Last Answer : (C) k ∝ √T
Description : The energy radiated from a surface Q at absolute temperature T is related as (A) Q ∝ T 2 (B) Q ∝ T 4 (C) Q ∝ T 3 (D) None of these
Last Answer : (B) Q ∝ T
Description : In case of liquids, the binary diffusivity is proportional to (where, T = temperature) (A) T (B) √T (C) T 2 (D) 1/T
Last Answer : (A) T
Description : The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of (A) Newtonian liquids (B) Non-Newtonian liquids (C) Ideal gases (D) Real gases
Last Answer : (C) Ideal gases
Description : Pick out the wrong statement. (A) The binary diffusivity in liquids is of the order of 10 -5 cm2 /sec (B) Molecular diffusion in solid is much faster than that in liquids ( ... Poiseuille's law, the permeability decreases with increase in temperature for flow of a gas through a given capillary
Last Answer : (B) Molecular diffusion in solid is much faster than that in liquids
Description : The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of (A) T (B) T and P (C) T, P and Z (D) T and Z
Last Answer : (B) T and P
Description : According to Arrhenius equation of temperature dependency of rate constant for an elementary reaction (A) k ∝ √T (B) k ∝ e -E/RT (C) k ∝ T e -E/RT (D) None of these
Last Answer : (B) k ∝ e -E/RT
Description : The binary diffusivity in gases does not depend upon the (A) Pressure (B) Temperature (C) Nature of the components (D) None of these
Last Answer : (D) None of these
Description : In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the (A) Temperature and pressure (B) Concentration (C) Nature of the constituents (D) None of these
Description : Boyle's law for gases states that (A) P ∝ 1/V, when temperature is constant (B) P ∝ 1/V, when temperature & mass of the gas remain constant (C) P ∝ V, at constant temperature & mass of the gas (D) P/V = constant, for any gas
Last Answer : (B) P ∝ 1/V, when temperature & mass of the gas remain constant
Description : Transition state theory relates the above quantities as (A) k ∝ e -E/RT (B) k ∝ T.e E/RT (C) k ∝ √T (D) k ∝ T 1.5
Last Answer : (B) k ∝ T.e E/RT
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
Description : The critical speed of a trommel (N) is related to its dia (D) as (A) N ∝ 1/√D (B) N ∝ √D (C) N ∝ D (D) N ∝ 1/D
Last Answer : (A) N ∝ 1/√D
Description : The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) (A) ∝ t (B) ∝ 1/t (C) ∝ √t (D) Independent of 't
Last Answer : (B) ∝ 1/t
Description : Charles' law for gases states that (A) V/T = Constant (B) V ∝ 1/T (C) V ∝ 1/P (D) PV/T = Constant
Last Answer : (A) V/T = Constant
Description : 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
Last Answer : (B) 10 -1 cm2 /sec
Description : In case of gases, the binary diffusivity is proportional to (where, P = pressure). (A) P (B) 1/P (C) 1/√P (D) √P
Last Answer : (B) 1/P
Description : The Knudsen diffusivity is proportional to (where, T = absolute temperature) (A) √T (B) T 2 (C) T (D) T 4
Last Answer : (A) √T
Description : The current I passing through the galvanometer coil is related to the angle of deflection θ as a) I ∝ θ b) I 1/∝ θ c) I ∝ θ 2 d) I 1/∝ θ 2
Last Answer : a) I ∝ θ
Description : 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 ... ) The Lewis number of a mixture is unity, when the thermal diffusivity is equal to the mass diffusivity
Last Answer : (B) 1 Nm3 of dry air is lighter than 1Nm3 of humid air
Description : One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect (A) ... The fraction vaporised but not the product composition (D) Neither the product composition nor the fraction vaporised
Last Answer : (C) The fraction vaporised but not the product composition
Description : The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x1. x2, where A is a constant. The corresponding equation for ln y1, where y1is the activity co-efficient of component 1, is (A) A . x22 (B) Ax1 (C) Ax2 (D) Ax12
Last Answer : (A) A . x22
Description : At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2 ... Re -1.0 (B) Po ∝ Re 0.0 (C) Po ∝ Re 0.5 (D) Po ∝ Re 1.0
Last Answer : (B) Po ∝ Re 0.0 (C) Po ∝ Re 0.5
Description : As per Gilliland's equation, the diffusivity is (A) Directly proportional to 'T 1.5 ' (B) Inversely proportional to 'P' (C) Dependent on the molecular volume & molecular weight of components (D) All 'a', 'b' & 'c'
Last Answer : (D) All 'a', 'b' & 'c'
Description : Effective diffusivity (DE) in a catalyst pellet is related to molecular diffusivity (DN) and Knudsen diffusivity (DK) as (A) DE = DM + DK (B) 1/DE = 1/DN + DK (C) DE = DM . DE (D) DE = DN/DE
Last Answer : (B) 1/DE = 1/DN + DK
Description : Pick out the correct statement. (A) Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas (B) The 'Hatta number' is ... reflux in case of distillation operation requires infinite number of plates for a binary system separation
Last Answer : (C) For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion
Description : Pick out the wrong statement. (A) The mole fraction of solute is directly proportional to the molality of a 'dilute' solution (B) For a non-reacting binary mixture of ideal gases, the partial ... at all temperature (D) The relative volatility of a binary mixture at the Azeotropic composition is 1
Last Answer : (C) Azeotropes obey Raoult's law at all temperature
Description : Pick out the wrong statement. (A) Constant pressure distillation cannot separate an Azeotropic mixture (B) Relative volatility of a binary mixture changes appreciably with the minor change in ... unity (D) Flash distillation is practised on wide spread scale in petroleum refinery
Last Answer : (B) Relative volatility of a binary mixture changes appreciably with the minor change in temperature
Description : The relative volatility of a binary mixture at constant temperature __________ the total pressure. (A) Decreases with increase in (B) Increases with increase in (C) Is independent of (D) None of these
Last Answer : (A) Decreases with increase in
Description : Mass flow of granular solid (M) through a circular opening of dia, D follows (A) M ∝ √D (B) M ∝ D2 (C) M ∝ D3 (D) M ∝ D
Last Answer : (C) M ∝ D
Description : For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np ) varies with NRe as (A) Np ∝ NRe (B) Np ∝ √NRe (C) Np → constan (D) Np ∝ 1/NRe
Last Answer : (D) Np ∝ 1/NRe
Description : The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake) (A) ∝ ΔP (B) ∝ 1/ ΔP (C) ∝ √ΔP (D) Independent of ΔP
Last Answer : (D) Independent of ΔP
Description : Drag force on the float of a Rotameter is (where Q = flow rate of the) (A) ∝ Q (B) ∝ √Q (C) ∝ Q2 (D) Constant
Last Answer : (D) Constant
Description : The-relative volatility for separation of a non-ideal binary mixture by distillation should be (A) 0 (B) 1 (C) > 1 (D) < 1
Last Answer : (C) > 1
Description : 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 (A) 1 (B) 0 (C) 2 (D) 3
Last Answer : (A) 1
Description : The relative volatility of a binary mixture at the Azeotropic composition is (A) 1 (B) > 1 (C) 0 (D) ∞
Last Answer : (D) ∞
Description : Pick out the correct statement. (A) Diffusivity decreases with increase in temperature (B) Diffusivity increases with increase in molecular weight (C) Diffusivity increases with the size of the individual molecule (D) None of these
Description : Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the (A) Mass transfer co-efficient (B) Thermal diffusivity (C) Kinematic viscosity (D) Volumetric diffusivity
Last Answer : (A) Mass transfer co-efficient
Description : Molecular diffusivity of a liquid (A) Increases with temperature (B) Decreases with temperature (C) May increase or decrease with temperature (D) Is independent of temperature
Last Answer : (A) Increases with temperature
Description : With increase in temperature, the rate of leaching increases, because the (A) Diffusivity of solute increases (B) Viscosity of solvent decreases (C) Thermal conductivity of solute increases (D) None of these
Last Answer : (A) Diffusivity of solute increases
Description : With increase in temperature, the leaching rate increases because of the (A) Increased diffusivity (B) Decreased viscosity of liquid (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : With increase in temperature, the leaching rate increases due to (A) Decreased liquid viscosity (B) Increased diffusivity (C) Both (A) and (B) (D) Neither (A) nor (B)
Description : If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the (A) Pressure (B) Temperature (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (B) Temperature
Description : 1. __________ of air does not increase with increase in temperature. (A) Density (B) Thermal diffusivity (C) Viscosity (D) Thermal conductivi
Last Answer : Option A
Description : The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________ (A) 1 (B) 0.5 (C) 10 (D) 0
Description : Liquid diffusivity is of the order of __________ cm2 /second. (A) 0.01 (B) 0.1 (C) 10 -5 to 10 -6 (D) > 1
Last Answer : (C) 10 -5 to 10
Description : The eddy diffusivity for a liquid in plug flow must be (A) 1 (B) 0 (C) ∞ (D) Between 0 and 1
Last Answer : (B) 0
Description : For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the (A) Catalyst size is reduced or the ... the catalyst diffusivity is reduced (D) Catalyst size is increased or the catalyst diffusivity is increased
Last Answer : (B) Catalyst size is reduced or the catalyst diffusivity is increased
Description : Gibbs-Duhem equation (A) States that n1dμ1 + n2dμ2 + ....njdμj = 0, for a system of definite composition at constant temperature and pressure (B) Applies only to binary systems (C) Finds no application in gas-liquid equilibria involved in distillation (D) None of these
Last Answer : (A) States that n1dμ1 + n2dμ2 + ....njdμj = 0, for a system of definite composition at constant temperature and pressure