Chemical Engineering MCQs

Page No. 350

Pick out the correct statement?


aParaffins have higher octane number than corresponding iso-paraffin

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bParaffins have lower smoke point than aromatics

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cSuitability of kerosene as a fuel & as an illuminant may be determined by char value test

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dAviation fuel should have very high cloud point

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View Answer Paraffins have lower smoke point than aromatics

Pick out the wrong statement?


aMultigrade lubricating oils have high viscosity index

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bParaffinic oil has very high viscosity index

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cNaphthenic oil has very low viscosity index

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dHigh viscosity index means a large change in viscosity with change in temperature

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View Answer High viscosity index means a large change in viscosity with change in temperature

Pick out the wrong statement?


aClausius-Clapeyron equation relates the latent heat of vaporisation to the slope of the vapor pressure curve

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bAt the boiling point of liquid at the prevailing total pressure, saturated absolute humidity is infinite

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cPercentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture

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dClapeyron equation is given by dP/dT = (λ/T) (VG – VL); where, P = vapor pressure, T = absolute temperature, λ = latent heat of vaporisation, VG and VL = volumes of gas and liquid respectively

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View Answer Percentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture

Pick out the wrong statement?


aTo make 100 kg of a solution containing 40% salt by mixing solution A (containing 25% salt) and solution B (containing 50% salt), the amount of solution A required is 40 kg

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b1.2 gm atoms of carbon and 1.5 gm moles of oxygen are reacted to give 1 gm mole of carbon dioxide. The limiting reactant is carbon. The percent excess reactant supplied is 25

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cA gas bubble at a pressure of Pg is passed through a solvent with a saturation vapour pressure of Ps. If the time of passage of the bubble is long and air is insoluble in the solvent, the mole fraction of solvent in the bubble will be equal to Ps/Pg

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dA supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C1. The output rate of solids from an efficient crystalliser is (C + C1) V

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View Answer A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C1. The output rate of solids from an efficient crystalliser is (C + C1) V

Pick out the wrong statement?


aTen times dilution of a normal solution (N) reduces its normality to N/10

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bWhen equal weights of oxygen and methane are mixed in an empty reactor at room temperature, then the fraction of total pressure exerted by the oxygen is 1/2

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cVolume occupied by 9.034 x 1023 atoms of oxygen in ozone (O3) at NTP will be 11200 c.c

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dOne kg mole of an ideal gas at N.T.P occupies 22400 Nm3

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View Answer One kg mole of an ideal gas at N.T.P occupies 22400 Nm3

Pick out the wrong unit conversion of calorific value?


a1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg

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b1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3

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c1 BTU/lb = 2.3 kcal/kg

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d1 kcal/m3 = 0.1124 BTU/ft3

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View Answer 1 BTU/lb = 2.3 kcal/kg

Pick out the wrong statement ?


a‘Reduced temperature’ of a substance is the ratio of its existing temperature to its critical temperature, both expressed on Celsius scale

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b‘Reduced pressure’ is the ratio of the existing pressure of a substance to its critical pressure

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c‘Reduced volume’ is the ratio of the existing molal volume of a substance to its critical molal volume

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dNone of these

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View Answer ‘Reduced temperature’ of a substance is the ratio of its existing temperature to its critical temperature, both expressed on Celsius scale

Pick out the wrong statement?


aHeat capacity of a diatomic gas is higher than that of a monatomic gas

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bEqual volumes of Argon and Krypton contain equal number of atoms

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cTotal number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023

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dThe binary mixture of a particular composition in both vapor and liquid state is known as an azeotropic mixture

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View Answer Equal volumes of Argon and Krypton contain equal number of atoms

Pick out the wrong statement?


aA vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure

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bA vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a ‘superheated vapor’

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cThe temperature at which a vapor is saturated is termed as the boiling point

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dThe difference between the existing temperature of a vapor and its saturation temperature (i.e.dew point) is called its ‘degree of superheat’

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View Answer The temperature at which a vapor is saturated is termed as the boiling point

Pick out the one which is a first order instrument ?


aMercury in glass thermometer (without any covering or air gap)

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bBare metallic thermometer

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cBare vapor pressure thermometer

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dAll A., B. and C.

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View Answer All A., B. and C.

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