Quizsummary
0 of 65 questions completed
Questions:
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
Information
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to pass the previous Module's quiz in order to start this quiz
Results
Results
0 of 65 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
Earned Points: 0 of 0, (0)
0 Essay(s) Pending (Possible Points: 0)
Categories
 Not categorized 0%
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 Answered
 Review

Question 1 of 65
1. Question
In a venture meter, ∆P_{1} and ∆P_{2} are the pressure drops corresponding to volumetric flow rates Q_{1} and Q_{2}. If equals
CorrectIncorrect 
Question 2 of 65
2. Question
The volumetric properties of two gases M and N are described by the generalized compressibility chart which expresses the compressibility factor (Z) as a function of reduced pressure and reduced temperature only. The operating pressure (P) and temperature (T) of two gases M and N along with their critical properties (P_{C}, T_{C}) are given in the table below.
Z_{M} and Z_{N} are the compressibility factor of the gases M and N under the given operating conditions respectively.
The relation between Z_{M} and z_{N} is
CorrectIncorrect 
Question 3 of 65
3. Question
Match the polymerization process in Group1 with the polymers in Group2.
Group1 Group2
P) Free radical polymerization I) Nylon 6.6
Q) Ziegler Natta polymerization II) Polypropylene
R) Condensation polymerization III) Poly vinyl chloride
Choose the correct set of combinations.
CorrectIncorrect 
Question 4 of 65
4. Question
An LVDT (Linear Variable Differential Transformer) is a transducer used for converting
CorrectIncorrect 
Question 5 of 65
5. Question
Match the variables in Group1 with the instruments in Group2.
Group1 Group2
P) Temperature I) Capacitance probe
Q) Liquid level II) McLeod gauge
R) Vacuum III) Chromatograph
S) Concentration IV) Thermistor
Choose the correct set of combinations.
CorrectIncorrect 
Question 6 of 65
6. Question
The thickness of laminar boundary layer over a flat plate varies along the distance from the leading edge of the plate. As the distance increases, the boundary layer thickness
CorrectIncorrect 
Question 7 of 65
7. Question
The marks obtained by a set of students are 38, 84, 45,70, 75, 60, 48.
The mean and median marks, respectively, are
CorrectIncorrect 
Question 8 of 65
8. Question
In a heat exchanger, the inner diameter of a tube is 25 mm and its outer diameter is 30 mm. The overall heat transfer coefficient based on the inner area is 360 W/m^{2}.℃. Then, the overall heat transfer coefficient based on the outer area, rounded to the nearest integer, is ___W/m^{2}.℃.
CorrectIncorrectHint
NAT Type Question

Question 9 of 65
9. Question
The cost of a new pump (including installation) is 24,000 Rupees. The pump has useful life of 10 years. Its salvage value is 4000 Rupees. Assuming straight line depreciation, the book value of the pump at the end of 4th year, rounded to the nearest integer, is ___ Rupees.
CorrectIncorrectHint
NAT Type Question

Question 10 of 65
10. Question
A gas bubble (gas density ρ_{g} = 2 kg/m^{3}; bubble diameter D = 10^{−}^{4} m) is rising vertically through water (gas density ρg = 1000 kg/m^{3}; viscosity μ = 0.001 Pa.s) Force balance on the bubble leads to the following equation,
Where n is the velocity of the bubble at any given time t. Assume that the volume of the rising bubble does not change. The value of g = 9.81 m/s^{2}.
The terminal rising velocity of the bubble (in cm/s), rounded to 2 decimal places, is ___ cm/s.
CorrectIncorrectHint
NAT Type Question

Question 11 of 65
11. Question
Water is heated at atmospheric pressure from 40℃ to 80℃ using two different processes. In process I, the heating is done by a source at 80℃. In process II, the water is first heated from 40℃ to 60℃ by a source at 60℃, and the then from 60℃ to 80℃ by another source at 80℃. Identify the correct statement.
CorrectIncorrect 
Question 12 of 65
12. Question
The DCDA (Double Contact Double Absorption) process is used the manufacture of
CorrectIncorrect 
Question 13 of 65
13. Question
The real part of 6e^{i}^{π/3} is ____.
CorrectIncorrectHint
NAT Type Question

Question 14 of 65
14. Question
Consider a first order catalytic reaction in a porous catalyst pellet.
Given R – characteristic length of the pellet: D_{e} – effective diffusivity; k_{c} – mass transfer coefficient k_{1} – rate constant based on volume of the catalyst pellet; C_{s} – concentration of reactant on the pellet surface.
The expression for Thiele modulus is
CorrectIncorrect 
Question 15 of 65
15. Question
Which of the following conditions are valid at the plait point?
P) Density difference between the extract and raffinate phases is zero
Q) Interfacial tension between the extract and raffinate phases is zero
R) Composition difference between the extract and raffinate phases is zero
CorrectIncorrect 
Question 16 of 65
16. Question
The purpose of the mathanation reaction used in ammonia plants is to
CorrectIncorrect 
Question 17 of 65
17. Question
Which of the following is the correct sequence of equipment for size reduction of solids?
CorrectIncorrect 
Question 18 of 65
18. Question
Let i and j be the unit vectors in the x and y directions, respectively. For the function
F(x, y) = x^{3} + y^{2}
the gradient of the function i.e.. ∇F is given by
CorrectIncorrect 
Question 19 of 65
19. Question
Consider steady state mass transfer of a solute A from a gas phase to a liquid phase. The gas phase bulk and interface mole fractions are y_{A, G} and y_{A, i} respectively. The liquid phase bulk and interface mole fractions are x_{A, L} and x_{A, i}, respectively. The ratio is very close to zero.
The implies that mass transfer resistance is
CorrectIncorrect 
Question 20 of 65
20. Question
The value of
CorrectIncorrectHint
NAT Type Question

Question 21 of 65
21. Question
For a solidcatalyzed gas phase reversible reaction, which of the following statements is ALWAYS TRUE?
CorrectIncorrect 
Question 22 of 65
22. Question
The onedimensional unsteady heat conduction equation is
Where, T – temperature, t – time, r – radial position, k – thermal conductivity, ρ density, and C_{p} – specific heat.
For the cylindrical coordinate system, the value of n in the above equation is
CorrectIncorrect 
Question 23 of 65
23. Question
The composition of vapour entering a tray in a distillation column is 0.47. The average composition of the vapour leaving the tray is 0.53. The equilibrium composition of the vapour corresponding to the liquid leaving this tray is 0.52. All the compositions are expressed in mole fraction of the more volatile component.
The Murphree efficiency based on the vapour phase, rounded to the nearest integer, is ___ %.
CorrectIncorrectHint
NAT Type Question

Question 24 of 65
24. Question
The number of positive roots of the function f (x) shown below in the range 0 < x < 6 is ___________.
CorrectIncorrectHint
NAT Type Question

Question 25 of 65
25. Question
The following reaction rate curve is shown for a reaction A → P. Here, (−r_{A}) and x_{A} represent reaction rate and conversion, respectively. The feed is pure A and 90% conversion is desired
Which amongst the following reactor configurations gives the lowest total volume of the reactor (s)?
CorrectIncorrect 
Question 26 of 65
26. Question
The total cost (C_{T}) of an equipment in terms of the operation variable x and y is
The optimal value of C_{T}, rounded to 1 decimal place, is _______.
CorrectIncorrectHint
NAT Type Question

Question 27 of 65
27. Question
The vapour pressure of a pure substance at a temperature T is 30bar. The actual and ideal gas values of g / RT for the saturated vapour at this temperature T and 30 bar are 7.0 and 7.7 respectively. Here, g is the molar Gibbs free energy and R is the universal gas constant. The fugacity of the saturated liquid at these conditions, rounded to 1 decimal place, is ___ bar.
CorrectIncorrectHint
NAT Type Question

Question 28 of 65
28. Question
The Sherwood number (Sh_{L}) correlation for laminar flow over a flat plate of length L is given by
Where Re_{L} and Sc represent Reynolds number and Schmidt number, respectively.
This correlation, expressed in the form of ChiltonColburn j_{D} factor, is
CorrectIncorrect 
Question 29 of 65
29. Question
For the initial value problem
the value of x at t = π/3, is _____.
CorrectIncorrectHint
NAT Type Question

Question 30 of 65
30. Question
In a counter current stripping operation using pure steam the mole ratio of a solute in the liquid stream is reduced from 0.25 to 0.05. The liquid feed flow rate, on a solutefree basis, is 3mole/s. The equilibrium line for the system is given in the figure below.
The MINIMUM flow rate of pure steam for this process, rounded to 1 decimal place, is ___mol/s.
CorrectIncorrectHint
NAT Type Question

Question 31 of 65
31. Question
The Laplace transform of a function is The initial and final values, respectively, of the function are
CorrectIncorrect 
Question 32 of 65
32. Question
The following table provides four sets of Fanning friction factor data, for different values of Reynolds number (Re) and roughness factor
Which of the above sets of friction factor data is correct?
CorrectIncorrect 
Question 33 of 65
33. Question
In a batch adsorption process, 5 g of fresh adsorbent is used to treat 1 litre of an aqueous phenol solution. The initial phenol concentration is 100 mg/litre. The equilibrium relation is given by q* = 1.3C
Where, q* is the amount of phenol adsorbed in mg of phenol per gram of adsorbent: and C is the concentration of phenol in mg/litre in the aqueous solution.
When equilibrium is attained between the adsorbent and the solution, the concentration of phenol in the solution, rounded to 1 decimal place is ___________ mg/litre.
CorrectIncorrectHint
NAT Type Question

Question 34 of 65
34. Question
A bond has a maturity value of 20,000 Rupees at the end of 4 years. The interest is compounded at the rate of 5% per year.
The initial investment to be made, rounded to the nearest integer, is _______ Rupees.
CorrectIncorrectHint
NAT Type Question

Question 35 of 65
35. Question
Size analysis was carried out on a sample of gravel. The data for mass fraction (x_{i}) and average particle diameter (D_{pi}) of the fraction is given in the table below :
The mass mean diameter of the sample, to the nearest integer, is ________mm.
CorrectIncorrectHint
NAT Type Question

Question 36 of 65
36. Question
A propeller (diameter D = 15 m) rotates at N = 1 revolution per second (rps). To understand the flow around the propeller, a labscale model is made. Important parameters to study the flow are velocity of the propeller tip (V = πND), diameter D and acceleration due to gravity (g). The labscale model is 1/100^{th} of the size of the actual propeller.
The rotation speed of the labscale model, to the nearest integer, should be _________ rps.
CorrectIncorrectHint
NAT Type Question

Question 37 of 65
37. Question
The transfer function of a system is
For a unit step increase in the input, the fractional overshoot, rounded to 2 decimal places, is ______.
CorrectIncorrectHint
NAT Type Question

Question 38 of 65
38. Question
A fluid over a heated horizontal plate maintained at temperature T_{w}. The bulk temperature of the fluid is T_{∞} . The temperature profile in the thermal boundary layer is given by:
Here, y is the vertical distance from the plate, δ_{t} is the thickness of the thermal boundary layer and k is the thermal conductivity of the fluid.
The local heat transfer coefficient is given by
CorrectIncorrect 
Question 39 of 65
39. Question
The following liquid secondorder reaction is carried out in an isothermal CSTR at steady state A → R (−r_{A}) = 0.005 C_{A}^{2} mol/m^{3}.hr
Where, C_{A} is the concentration of the reactant in the CSTR. The reactor volume is 2m^{3}, the inlet flow rate is 0.5 m^{3}/hr and the inlet concentration of the reactant is 1000 mol/m^{3}. The fractional conversion, rounded to 2 decimal places, is _____.
CorrectIncorrectHint
NAT Type Question

Question 40 of 65
40. Question
Reaction A → B is carried out in a reactor operating at steady state and 1 mol/s of pure A at 425℃ enters the reactor. The outlet stream leaves the reactor at 325℃. The heat input to the reactor is 17kW. The heat of reaction at the reference temperature of 25℃ is 30kJ/mol. The specific heat capacities (in kJ/mol.K) of A and B are 0.1 and 0.15, respectively.
The molar flowrate of B leaving the reactor, rounded to 2 decimal places, is ____mol/s.
CorrectIncorrectHint
NAT Type Question

Question 41 of 65
41. Question
The Ccurve measured during a pulse tracer experiment is shown below. In the figure, C(t) is the concentration of the tracer measured at the reactor exit in mol/liter at time t seconds.
The mean residence time in the reactor, rounded to 1 decimal place, is ______ s.
CorrectIncorrectHint
NAT Type Question

Question 42 of 65
42. Question
The reversible reaction of tbutyl alcohol (TBA) and ethanol (EtOH) to ethyltbutyl ether (ETBE) is
TBA + EtOH ⇌ ETBE +Water
The equilibrium constant for this reaction is K_{C} = 1. Initially, 74 g of TBA is mixed with 100g of aqueous solution containing 46 weight% ethanol. The molecular weights are:74g/mol for TBA. 46g/mol for EtOH, 102g/mol for ETBE, and 18 g/mol for water.
The mass of ETBE at equilibrium, rounded to 1 decimal place, is ____g.
CorrectIncorrectHint
NAT Type Question

Question 43 of 65
43. Question
Let I_{b}_{λ} be the spectral black body radiation intensity per unit wavelength about the wavelength λ. The blackbody radiation intensity emitted by a blackbody over all wavelengths is
CorrectIncorrect 
Question 44 of 65
44. Question
Match the equipment in Group1 with the process in Group2:
Group1
(P) Fluidized bed
(Q) Multistage adiabatic reactor with Interstage cooling.
(R) Fourdrinier machine
(S) Diaphragm cell
Group2
(I) Papermaking
(II) Sodium hydroxide manufacturer
(III) SO_{2} oxidation
(IV) Catalytic cracking
Choose the correct set of combinations.
CorrectIncorrect 
Question 45 of 65
45. Question
Oil is being delivered at a steady state flowrate through a circular pipe of a radius 1.25 × 10^{−}^{2} m and length 10 m. The pressure drop access the pipe is 500 Pa.
The shear stress at the pipe wall, rounded to 2 decimal places______ Pa
CorrectIncorrectHint
NAT Type Question

Question 46 of 65
46. Question
Match the problem type in Group1 with the numerical method in Group2
Group1 Group2
(P) System of linear algebraic equations (I) NewtonRaphson
(Q) Nonlinear algebraic equations (II) Gaussseidel
(R) Ordinary differential equations (III) Simphson’s Rule
(S) Nemerical integrations (IV) RungeKutta
Choose the correct set of combinations.
CorrectIncorrect 
Question 47 of 65
47. Question
The following gasphase reaction is carried out in a constantvolume isothermal batch reactor
A + B → R + S
The reactants A and B as well as the product S are noncondensable gases. At the operating temperature, the saturation pressure of the product R is 40 kPa.
Initially, the batch reactor contains equimolar amounts of A and B (and no products) at a total pressure of 100 kPa. The initial concentrations of the reactants are C_{A, 0} = C_{B, 0} = 12.56 mol/m^{3}. The rate of reaction is given by (−r_{A}) = 0.08C_{A}C_{B} mol/m^{3}.s.
The time at which R just starts condensing, rounded to 1 decimal place, is_____
CorrectIncorrectHint
NAT Type Question

Question 48 of 65
48. Question
The vapor phase composition and relative volatilities (with respect to npropane) on an ideal tray of a distillation column are
The mole fraction of npropane in the liquid phase, rounded to 2 decimal places, is ____.
CorrectIncorrectHint
NAT Type Question

Question 49 of 65
49. Question
The Characteristic equation of a closedloop system is
6s^{3} + 11s^{2} + 6s + (1 + k) = 0, Where k > 0
The value of K beyond which the system just becomes unstable, rounded to the nearest integer, is _____.
CorrectIncorrectHint
NAT Type Question

Question 50 of 65
50. Question
A aqueous saltsolution enters a crystallizer operating at steady state at 25℃. he feed temperature is 90℃ and the salt concentration in the feed is 40 weight%. The salt crystallizes as a pentahydrate. The crystals and the mother liquor leave the crystallizer. The molecular weight of the anhydrous salt is 135. The solubility of the salt at 25℃ is 20 weight%.
The feed flowrate required for a production rate of 100 kg/s of hydrated salt, rounded to the nearest integer, is ____ kg/s.
CorrectIncorrectHint
NAT Type Question

Question 51 of 65
51. Question
The pressure of a liquid is increased isothermally. The molar volume of the liquid decreases from 50.45 × 10^{−}^{6} m^{3}/mol to 48 × 10^{−}^{6} m^{3}/mol during this process. The isothermal compressibility of the liquid is 10^{−}^{9} Pa^{−}^{1}, which can b e assumed to be independent of pressure.
The change in the molar Gibbs free energy of liquid, rounded to nearest integer, is J/mol.
CorrectIncorrectHint
NAT Type Question

Question 52 of 65
52. Question
The open loop transfer function of a process with a proportional controller (gain K_{C}) is
Based on the Bode criterion for closedloop stability, the ultimate gain of the controller, rounded to 2 decimal places, is____.
CorrectIncorrectHint
NAT Type Question

Question 53 of 65
53. Question
In nucleate boiling, the pressure inside a bubble is higher than the pressure of the surrounding liquid. Assuming that both the liquid and vapour are saturated, the temperature of the liquid will ALWAYS be
CorrectIncorrect 
Question 54 of 65
54. Question
A box has 6 red balls and white balls. A ball is picked at random and replaced in the box, after which a second ball is picked.
The probability of both the balls being red, rounded to 2 decimal places, is ____.
CorrectIncorrectHint
NAT Type Question

Question 55 of 65
55. Question
A sparingly soluble gas (solute) is in equilibrium with a solvent at 10 bar. The mole fraction of the solvent in the gas phase is 0.01. At the operating temperature and pressure, the fugacity coefficient of the solute in the gas phase and the Henry’s law constant are 0.92 and 1000 bar, respectively. Assume that the liquid phase obeys Henry’s law.
The MOLE PERCENTAGE of the solute in the liquid phase, rounded to 2 decimal places, is _____.
CorrectIncorrectHint
NAT Type Question

Question 56 of 65
56. Question
Consider the following sentences:
All benches are bed is a bulb. Some bulbs are lamps.
Which of the following can be inferred?
(i) Some beds are lamps.
(ii) Some lamps are beds.
CorrectIncorrect 
Question 57 of 65
57. Question
The following sequence of numbers is arranged in increasing order: 1,x,x,x, y, y,9,16,18. Given that the mean and median are equal, and are also equal to twice the mode, the value of y is
CorrectIncorrect 
Question 58 of 65
58. Question
The bacteria in milk are destroyed when it _________ heated to 80 degree Celsius.
CorrectIncorrect 
Question 59 of 65
59. Question
If the radius of a right circular cone is increased by 50%, its volume increases by
CorrectIncorrect 
Question 60 of 65
60. Question
__________ with someone else’s email account is now very serious offence.
CorrectIncorrect 
Question 61 of 65
61. Question
Students applying for hostel rooms are allotted rooms in order of seniority. Students already staying in a room will move if they get a room in their preferred list. Preferences of lower ranked applicants are ignored during allocation.
Given the data below, which room will Ajit stay in?
CorrectIncorrect 
Question 62 of 65
62. Question
The bar graph below shows the output of five carpenters over one month, each of whom made different items of furniture: Chairs, tables, and beds.
Consider the following statements.
(i) The number of beds made by carpenter C2 is exactly the same as the same as the number
of tables made by carpenter C3.
(ii) The total number of chairs made by all carpenters is less than the total number of tables.
Which one of the following is true?
CorrectIncorrect 
Question 63 of 65
63. Question
The last digit of (2171)^{7} + (2172)^{9} + (2173)^{11} + (2174)^{13} is
CorrectIncorrect 
Question 64 of 65
64. Question
Two machines M1 and M2 are able to execute any of four jobs P, Q, R and S. The machines can perform one job on one object at a time. Jobs P, Q, R and S take 30 minutes, 20 minutes, 60 minutes and 15 minutes each respectively. There are 10 objects each requiring exactly 1 job. Job P is to be performed on 2 objects. Job Q on 3 objects. Job R on 1 object and Job S on 4 objects. What is the minimum time needed to complete all the jobs?
CorrectIncorrect 
Question 65 of 65
65. Question
The old concert hall was demolished because of fears that the foundation would be affected by the construction tried to mitigate the impact of pressurized air pockets created by the excavation of large amounts of soil. But even with these safeguards, it was feared that the soil below the concert hall would not be stable.
From this, one can infer that
CorrectIncorrect