GATE Chemical Engineering online test 5
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Question 1 of 15
Which one of the following is an iterative technique for solving a system of simultaneous linear algebraic equations?Correct
Question 2 of 15
The partial molar enthalpy (in kJ/mol) of species 1 in a binary mixture is given by
h = 2 – 60 b*b + 100 a*b*b
where a and b are the mole fractions of species 1 and 2, respectively. The partial molar enthalpy (in kJ/mol, rounded off to the first decimal place) of species 1 at infinite dilution isCorrect
Question 3 of 15
For a flow through a smooth pipe, the Fanning friction factor f is given by f = mRe to the power -0.2 in the turbulent flow regime, where Re is the Reynolds number and m is a constant. Water flowing through a section of this pipe with a velocity 1 m/s results in a frictional pressure drop of 10 kPa.What will be the pressure drop across this section (in kPa), when the velocity of water is 2 m/s?Correct
Question 4 of 15
In a cyclone separator used for separation of solid particles from a dust laden gas, the separation factor is defined as the ratio of the centrifugal force to the gravitational force acting on the particle. Sr denotes the separation factor at a location (near the wall) that is at a radial distance r from the
centre of the cyclone. Which one of the following statements is INCORRECT?Correct
Question 5 of 15
Steam at 100 degree C is condensing on a vertical steel plate. The condensate flow is laminar. The average Nusselt numbers are Nu1 and Nu2, when the plate temperatures are 10 degreeC and 55 degreeC, respectively. Assume the physical properties of the fluid and steel to remain constant within the temperature
range of interest. Using Nusselt equations for film-type condensation, what is the value of the ratio Nu2 / Nu1 ?Correct
Question 6 of 15
A binary liquid mixture of benzene and toluene contains 20 mol% of benzene. At 350 K the vapour pressures of pure benzene and pure toluene are 92 kPa and 35 kPa, respectively. The mixture follows Raoult’s law. The equilibrium vapour phase mole fraction (rounded off to the second decimal place) of benzene in contact with this liquid mixture at 350 K isCorrect
Question 7 of 15
Match the dimensionless numbers in Group-1 with the ratios in Group-2.
P.Biot number I
Q.Schmidt number II
R.Grashof number III
I. buoyancy force / viscous force
II. internal thermal resistance of a solid / boundary layer thermal resistance
III. momentum diffusivity / mass diffusivityCorrect
Question 8 of 15
For what value of Lewis number, the wet-bulb temperature and adiabatic saturation temperature are nearly equal?Correct
Question 9 of 15
Hydrogen iodide decomposes through the reaction 2HI ⇋ H2 + I2. The value of the universal gas constant R is 8.314 J mol‒1K‒1. The activation energy for the forward reaction is 184000 J mol‒1. The ratio (rounded off to the first decimal place) of the forward reaction rate at 600 K to that at 550 K isCorrect
Question 10 of 15
Match the instruments in Group-1 with process variables in Group-2.
P Conductivity meter I Flow
Q Turbine meter II Pressure
R Piezoresistivity element III CompositionCorrect
Question 11 of 15
What is the order of response exhibited by a U-tube manometer?Correct
Question 12 of 15
A system exhibits inverse response for a unit step change in the input. Which one of the following statement must necessarily be satisfied?Correct
Question 13 of 15
Two design options for a distillation system are being compared based on the total annual cost. Information available is as follows:
Option P Option Q
Installed cost of the system (Rs in lakhs) 150 120
Cost of cooling water for condenser (Rs in lakhs/year) 6 8
Cost of steam for reboiler (Rs in lakhs/year) 16 20
The annual fixed charge amounts to 12% of the installed cost. Based on the above information,
what is the total annual cost (Rs in lakhs /year) of the better option?Correct
Question 14 of 15
Standard pipes of different schedule numbers and standard tubes of different BWG numbers are available in the market. For a pipe / tube of a given nominal diameter, which one of the following statements is TRUE?Correct
Question 15 of 15
Terms used in engineering economics have standard definitions and interpretations. Which one of the following statements is INCORRECT?Correct