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Full Length Test #6
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 APTITUDE 0%
 CHEMICAL REACTION ENGINEERING 0%
 DIFFICULT 0%
 FLUID MECHANICS 0%
 HEAT TRANSFER 0%
 MASS TRANSFER 0%
 MATHEMATICS 0%
 PLANT DESIGN 0%
 THERMODYNAMICS 0%
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Question 1 of 65
1. Question
1 pointsCategory: APTITUDEChoose the word that does NOT belong to the group
Correct
Ecstasy, grim and rapture are feelings while ‘cove’ means a gulf or a hole.
Incorrect
Ecstasy, grim and rapture are feelings while ‘cove’ means a gulf or a hole.

Question 2 of 65
2. Question
1 pointsCategory: APTITUDEChoose the word which is most nearly the SAME in meaning as the word given in bold
DEBUNKCorrect
Debunk means to expose one’s truth or to demystify.
Incorrect
Debunk means to expose one’s truth or to demystify.

Question 3 of 65
3. Question
1 pointsCategory: APTITUDESohail scored 33 marks in English, 37 marks in science, 28 marks in mathematics, 26 marks in Hindi, 32 marks in social studies. The maximum marks a student can score in each subject is 60. How much percent did Sohail get in this exam?
Correct
Total marks obtained by Sohail,
= 33 + 37 + 28 + 26 + 32 =156
%of marks obtained=(156/300) ×100 =52
Incorrect
Total marks obtained by Sohail,
= 33 + 37 + 28 + 26 + 32 =156
%of marks obtained=(156/300) ×100 =52

Question 4 of 65
4. Question
1 pointsCategory: APTITUDEA truck covers 448 km in 8 hours. The average speed of bicycle is 1/4 th of average speed of truck. How much distance will the bicycle cover in 7 hours?

Question 5 of 65
5. Question
1 pointsCategory: APTITUDEGiven below are three statements followed by three conclusions. Assuming these
statements to be true, decide which one logically follows:
Statements:
I. All trash barrels are filthy.
II. No container is filthy.
III. All baskets are containers.
Conclusions:
I. Some baskets are filthy.
II. No basket is a trash barrel.
III. Some baskets are containersCorrect
Baskets and filthy share no relationship as per the diagram, hence I is incorrect.
Conclusion II can be directly inferred from the diagram. Conclusion III cannot be
considered since the given statement explicitly mentions that all baskets are containers
and hence we cannot settle for partial information.Incorrect
Baskets and filthy share no relationship as per the diagram, hence I is incorrect.
Conclusion II can be directly inferred from the diagram. Conclusion III cannot be
considered since the given statement explicitly mentions that all baskets are containers
and hence we cannot settle for partial information. 
Question 6 of 65
6. Question
2 pointsCategory: APTITUDEGiven below are four sentences. Find out the odd sentence.
Correct
1,2, and 3 are about the importance of communication and talking while 4 is about drama
which may or may not be oral.Incorrect
1,2, and 3 are about the importance of communication and talking while 4 is about drama
which may or may not be oral. 
Question 7 of 65
7. Question
2 pointsCategory: APTITUDEIt was intrinsic to their grand passion that there should be _______; both were adept at slamming doors and _____ off into the night.
Correct
‘To have a row’ means to have a fight. ‘Storm off’ is used when a person leaves a place angrily.
Incorrect
‘To have a row’ means to have a fight. ‘Storm off’ is used when a person leaves a place angrily.

Question 8 of 65
8. Question
2 pointsCategory: APTITUDEHow many positive integers less than 10,000 are such that the product of their digits is 210?
Correct
Let’s start by breaking 210 down into primes: 210 = 10 × 21 = 2×5×3×7
so, to start, we know that all permutation of 2,3,5,7 will fulfill the requirements:
4! = 4×3×2 = 24
however, we have to recognize that we may be able to use 1 and another number in place
of a pair of our numbers.
Since each digit has to be less than or equal to 9, the only substitution we can do is to use
1×6 instead of 2×3 (2×5, the next smallest pair of primes, would give us 10).
So, we can also use the digits 1,5,6,7. Same as last time, this gives us 4! = 24 possibleIncorrect
Let’s start by breaking 210 down into primes: 210 = 10 × 21 = 2×5×3×7
so, to start, we know that all permutation of 2,3,5,7 will fulfill the requirements:
4! = 4×3×2 = 24
however, we have to recognize that we may be able to use 1 and another number in place
of a pair of our numbers.
Since each digit has to be less than or equal to 9, the only substitution we can do is to use
1×6 instead of 2×3 (2×5, the next smallest pair of primes, would give us 10).
So, we can also use the digits 1,5,6,7. Same as last time, this gives us 4! = 24 possible 
Question 9 of 65
9. Question
2 pointsCategory: APTITUDEEach day after an item is lost the probability of finding that item is halved. If 3 days after a certain item is lost the probability 1/64, what was the initial probability of finding the item?
Correct
If we let the original probability be x, we get:
x(1/2)(1/2)(1/2) = 1/64
x(1/8) = 1/64
x = (1/64)(8/1) = 8/64 = 1/8.Incorrect
If we let the original probability be x, we get:
x(1/2)(1/2)(1/2) = 1/64
x(1/8) = 1/64
x = (1/64)(8/1) = 8/64 = 1/8. 
Question 10 of 65
10. Question
2 pointsCategory: APTITUDESolution Y is 30 percent liquid X and 70 percent water. If 2 kilograms of water evaporate from 8 kilograms of solution Y and 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid, what percent of this new solution is liquid X?
Correct
Y is 3/10 liquid X and 7/10 water. We start with 8kg of the solution.
So the solution is 3/10 × 8 = 2.4kg of liquid X. Therefore there are 82.4 = 5.6kg water.
From this we subtract the 2kg water that has evaporated, leaving 5.62= 3.6 kg water.
We now have 2.4 kg liquid X and 3.6 kg water.
To this we now add 2kg of solution. So that would be 0.6kg of liquid X and 1.4 kg of
water that we are adding (solution is 3/10 liquid X and 7/10 water). So we now have 2.4
+0.6 = 3 kg of liquid X. and 3.6+1.4=5kg of water and we have 8kg in total. So the
percent of this new solution that is liquid X is: 3/8 =37.5%Incorrect
Y is 3/10 liquid X and 7/10 water. We start with 8kg of the solution.
So the solution is 3/10 × 8 = 2.4kg of liquid X. Therefore there are 82.4 = 5.6kg water.
From this we subtract the 2kg water that has evaporated, leaving 5.62= 3.6 kg water.
We now have 2.4 kg liquid X and 3.6 kg water.
To this we now add 2kg of solution. So that would be 0.6kg of liquid X and 1.4 kg of
water that we are adding (solution is 3/10 liquid X and 7/10 water). So we now have 2.4
+0.6 = 3 kg of liquid X. and 3.6+1.4=5kg of water and we have 8kg in total. So the
percent of this new solution that is liquid X is: 3/8 =37.5% 
Question 11 of 65
11. Question
1 pointsCategory: MATHEMATICS 
Question 12 of 65
12. Question
1 pointsCategory: MATHEMATICSConsider the matrix , where a11 = a22 = a33 = 0
Then sum of the cofactors of the leading diagonal elements is ______ 
Question 13 of 65
13. Question
1 pointsCategory: MATHEMATICSCorrect
Incorrect

Question 14 of 65
14. Question
1 pointsCategory: MATHEMATICSCorrect
Incorrect

Question 15 of 65
15. Question
1 pointsCategory: MATHEMATICSCorrect
Incorrect

Question 16 of 65
16. Question
1 pointsCategory: THERMODYNAMICSFor a given value of TH(source temperature) for a reversed Carnot cycle, the variation of TL(sink temperature) for different values of COP is represented by which one of the following graph?

Question 17 of 65
17. Question
1 pointsCategory: MASS TRANSFERFor absorption of NH3 from a dilute NH3 air mixture in water
Correct
Incorrect

Question 18 of 65
18. Question
1 pointsCategory: THERMODYNAMICSCorrect
Incorrect

Question 19 of 65
19. Question
1 pointsCategory: CHEMICAL REACTION ENGINEERINGFor a reaction A + 3B→5C + 7D which of the following is correct?

Question 20 of 65
20. Question
1 pointsCategory: HEAT TRANSFERMatch List I with List II and select the correct answer using the code given below the
lists:
List I List II
P Regenerative heat exchanger 1 Lungstrom air heater
Q Conduction through a spherical wall 2 Hyperbolic curve
R Schmidt Number 3 Mass diffusion
S Conduction through a cylindrical wall 4 Logarithmic curveCorrect
Incorrect

Question 21 of 65
21. Question
1 pointsCategory: CHEMICAL REACTION ENGINEERING 
Question 22 of 65
22. Question
1 pointsCategory: HEAT TRANSFERIf the temperature and emissivity of a surface are doubled, then the radiation heat transfer coefficient will
Correct
Incorrect

Question 23 of 65
23. Question
1 pointsCategory: HEAT TRANSFERThe thickness of the laminar boundary layer on a blade plate at a point A is 2 cm and at a point B, 1m downstream of ‘A’ is 3cm. What is the distance of ‘A’ from the leading edge of the plate(in m)?
Correct
Incorrect

Question 24 of 65
24. Question
1 pointsCategory: MASS TRANSFERCalculate the time period(in hours) to reduce the moisture content of a solid from 0.66 to 0.25 kg moisture 1 kg dry solid. The rate of drying N (kg water evaporated 1m² s). is given as
N= 0.0015x for x ≤ 0.3
N=0.00045 for x> 0.3
Where x =kg moisture /kg dry solid. The drying surface is 0.025 m²/kg solid.Correct
Incorrect

Question 25 of 65
25. Question
1 pointsCategory: MASS TRANSFERConventional ball mills are now being replaced by a new type of ball mill which is vibrated instead of being rotated and the rate of passage of material is controlled by the slope of the mill. Now, increase in the slope of the mill.
Correct
Incorrect

Question 26 of 65
26. Question
1 pointsCategory: MASS TRANSFERIn a gas mixture of oxygen and nitrogen, steady state equimolar counter diffusion is occurring at a total pressure of 101.325 kpa and temperature of 25ºC. If the concentration of oxygen at two planes 0.002m apart and perpendicular to the direction of diffusion are 20 vol% and 10 vol% respectively calculate the rate of diffusion of the O2 expressed as kmol/m²s. The molecular diffusivity of oxygen nitrogen mixture at 101.325 kpa and 25ºC is 1.85×10^−5 m²/ sec.
Correct
Incorrect

Question 27 of 65
27. Question
1 pointsCategory: PLANT DESIGNAs the height of solids in a cylindrical storage bin increases
Correct
Incorrect

Question 28 of 65
28. Question
1 pointsCategory: HEAT TRANSFERA hot fluid at 200ºC enters heat exchange at a mass flow rate at 10^4 kg/hr. Its specific heat is 2000 J/kg k. It is to be cooled by another fluid entering at 25ºC with a mass flow rate 2500 kg/hr. and specific heat 400 J/kg.k. The overall heat transfer coefficient based on outside area of 20 m² is 250 w/m²k. Find the exit temperature (in ºC) of the hot fluid when the fluid area in parallel flow.
Correct
Incorrect

Question 29 of 65
29. Question
1 pointsCategory: HEAT TRANSFERTwo large parallel plate one at 727 ºC with emissivity e1=0.8 and another at 227 ºC with emissivity e2=0.4. An aluminum radiation shield with an emissivity e3= 0.5 on both sides is placed between the plates. Calculate the percentage reduction in heat transfer rate between the two plates as a result of the shield. use σ=5.67×10^8 W /m²K^4
Correct
Incorrect

Question 30 of 65
30. Question
1 pointsCategory: HEAT TRANSFERA horizontal steam pipe 20 m long, 50 mm internal diameter, 60 mm outside diameter losses 13.5 kW heat to the surroundings at 310 k. The carries steam at 500k. Given that the convective heat transfer coefficient hc =1.65(ΔT)^0.25 W/m².k and the Stefan Boltz man constant 5.67 × 10^8 W/ m² k^4 . Find the emissivity of the bare surface of the pipe. upto 1 decimal place
Correct
Incorrect

Question 31 of 65
31. Question
1 pointsCategory: HEAT TRANSFERThe temperature drop through each layer of a two layer furnace wall is shown in figure.
Assume that the external temperature T1 and T3 are maintained constant and that T1>T3. If the thickness of the layer x1 and x2 are the same, which are of the following is correct? θ=30º with x axisCorrect
Incorrect

Question 32 of 65
32. Question
1 pointsCategory: MASS TRANSFERFind the mole fraction of feed that is vaporized, if mole fraction feed and the liquid after vaporization are 0.6 and 0.5 respectively. (Take α = 2)
Correct
Incorrect

Question 33 of 65
33. Question
2 pointsCategory: FLUID MECHANICSWater is forced into the device shown in fig. at the rate of 0.15m³/sec through pipe A, while oil of specific gravity 0.8 is forced in at the rate of 0.05m³/sec through pipe B. If the liquids are incompressible and form a homogeneous mixture of oil bubbles in water. What is the average velocity (in m/sec) of the mixture leaving through pipe C having a diameter of 0.564m. upto 1 decimal place
Correct
Incorrect

Question 34 of 65
34. Question
2 pointsCategory: FLUID MECHANICSA closed cylinder tank is 3.5 m high and contains an oil of relative density 0.85 to a height of 3.0 m above the bottom. The space above the oil surface contains air under a pressure of 50 Kpa if an 8 cm diameter orifice is provided on the side of the tank with its centre 25 cm above the bottom. what will be the weight of fluid discharged in 1 minute (Take cd=0.60)?
Correct
Incorrect

Question 35 of 65
35. Question
1 pointsCategory: DIFFICULTDrying of food is carried out in an insulated tray. The drying air has a partial pressure of water equal to 2360 Pa and a wet bulb temperature of 30oC. The product has a drying surface of 0.05 m²/kg dry solid. The material has a critical rate in the falling rate period is proportional to moisture content and mass transfer coefficient is 5.34×104 kg/m² hr Vapor pressure of water at 30ºC = 423 Pa The drying rate in the constant rate period in kg/m² .hr is_______________.
Correct
Incorrect

Question 36 of 65
36. Question
1 pointsCategory: MASS TRANSFERState the wrong statement among the following.
Correct
All the given statements are true except statement B. The correct answer should be chemisorption is specific.
Incorrect
All the given statements are true except statement B. The correct answer should be chemisorption is specific.

Question 37 of 65
37. Question
1 pointsThree moles each of N2 and H2 are allowed to enter a reactor where 50% conversion of key reactant is required. The percentage change in number of moles from initial condition to the final condition considering all the species present in the reactor is _____ %.
Correct
Incorrect

Question 38 of 65
38. Question
1 pointsA reversible engine operates between temperatures 900k and T2 (T2 < 900k) and another reversible engine between T2 and 400 k ( T2 > 400k) in series. Find the value of T2,( in K)if work outputs of both the engines are equal.
Correct
Incorrect

Question 39 of 65
39. Question
1 pointsA heat pump takes in heat from a reservoir at 5°C and delivers heat to a reservoir at 60°C. The heat pump is driven by a reversible heat engine which takes in heat from a reservoir at 840°C and rejects heat to a reservoir at 60°C. This heat engine also drives a machine that absorbs 30kw. If the heat pumps extract 17 kJ/s from the 5oC reservoir. The rate of heat supply from the 840oC source is________KW.
Correct
Incorrect

Question 40 of 65
40. Question
1 pointsCorrect
Incorrect

Question 41 of 65
41. Question
1 points50 kg of 60% strong acid is added to 30% acid to increase its concentration to 40%. The amount of 30% acid that has to be mixed with the strong acid to get 40% acid mixture will be _________ kg
Correct
Incorrect

Question 42 of 65
42. Question
1 pointsCommercial catalyst used for sulphuric acid manufacture contains approximately
Correct
6.2 to 6.5% vanadium pentoxide supported on silica and 1% potassium sulphate
Incorrect
6.2 to 6.5% vanadium pentoxide supported on silica and 1% potassium sulphate

Question 43 of 65
43. Question
1 pointsMatch the chemicals in GroupI with their functions in GroupII.
Group I Group II
P.Styrene 1.Buffer
Q.Tert diode cylmeca plate 2.catalyst
R.Potassium pyrophospate 3.Modibiel
4.Monomer
− −
P Q RCorrect
4 3 1
Incorrect
4 3 1

Question 44 of 65
44. Question
1 pointsTitanium can be used for storing
Correct
Chlorine gas which is sufficiently wet
Incorrect
Chlorine gas which is sufficiently wet

Question 45 of 65
45. Question
1 pointsThe initial cost of an asset is Rs 10,000 and estimated salvage value is Rs 1000 after an estimated useful life of 10 years. The rate of interest is 5%. The book value of the end of 2 years will be Rs._______.
Correct
Incorrect

Question 46 of 65
46. Question
1 pointsCorrect
F=125.7, P=165.8
Incorrect
F=125.7, P=165.8

Question 47 of 65
47. Question
1 pointsWhich of the following chemicals attacks/attack equipment made of borosilicate glass?
Correct
10% NaOH solution, 85% phosphoric acid at 110°C, HF acid
Incorrect
10% NaOH solution, 85% phosphoric acid at 110°C, HF acid

Question 48 of 65
48. Question
1 pointsCorrect
Incorrect

Question 49 of 65
49. Question
1 pointsCorrect
Incorrect

Question 50 of 65
50. Question
1 pointsCorrect
Incorrect

Question 51 of 65
51. Question
1 pointsCorrect
Incorrect

Question 52 of 65
52. Question
1 pointsThe ratio of gaseous reactants present in the combustion of 12g of carbon to the gaseous reactants present in oxycombustion of 12g carbon is ______.
Correct
Incorrect

Question 53 of 65
53. Question
1 pointsThe concentration of SO2 in the flue gases from boiler was found to be 0.2 kg/m³ at N.T.P. Determine the concentration of SO2 in parts per million by volume at N.T.P. Assume that the gases are perfect.
Correct
Incorrect

Question 54 of 65
54. Question
1 pointsA mixture 45% (by mass) acetic acid and remaining water is being separated by the extraction in a countercurrent multistage unit. Using Isopropyl ether as the solvent in the ratio 1.25 kg/kg feed, the final extraction composition on a solventfree basis is found to contain 15% by mass of acetic acid on a solventfree basis. The extract contains 80% of the acid Find the percentage of acid of the original feed which remains unextracted
Correct
Incorrect

Question 55 of 65
55. Question
1 pointsA gas expands from a volume of 5L to 8L against a constant pressure of 4.2 atm. The work done during this expansion is used to heat 7 mol of water at 20°C. The specific heat of water is 4.184 J/184 J/kgk. The final temperature of water will be_________ °C.
Correct
Incorrect

Question 56 of 65
56. Question
1 pointsCorrect
Incorrect

Question 57 of 65
57. Question
1 pointsAn equipment cost Rs 1,70,000 will have a scrap value of Rs 25,000 at the end of its useful life of 10 years. If the interest is compound at 10% per year, what will be the cost of replacement, the present worth and the capitalized costs?
Correct
Incorrect

Question 58 of 65
58. Question
1 pointsA thermometer of the time constant ten seconds, initially at 30°C, is suddenly immersed into water at 100°C. How long will it take for the thermometer reading to reach 90°C(in seconds)?
Correct
Incorrect

Question 59 of 65
59. Question
1 pointsCorrect
Incorrect

Question 60 of 65
60. Question
1 pointsCorrect
Incorrect

Question 61 of 65
61. Question
1 pointsContinuous measurement of moisture content of the paper in the paper industry is done by measuring the
Correct
Electrical resistance through the paper
Incorrect
Electrical resistance through the paper

Question 62 of 65
62. Question
1 pointsThe power required per kilometer of a pipe to overcome the viscous resistance to the flow of a liquid through a horizontal pipe is 28.72 K watt, at the rate of 9.8lt/sec. Take μ =10 poise
and kinetic viscosity = 6 stokes. Calculate the diameter of the pipe in metersCorrect
Incorrect

Question 63 of 65
63. Question
1 pointsConsider the following statements:
(I): Temperature is an extensive property and a state function.
(II): Temperature is an intensive property and a state function.
(III): Pressure is a path function and intensive property.
(IV): Pressure is a state function and intensive property.
Then,Correct
Both temperature and pressure are state functions and are intensive properties
Incorrect
Both temperature and pressure are state functions and are intensive properties

Question 64 of 65
64. Question
1 pointsIn a plug flow reactor A gas phase reaction is going on 3A→2B+3C with 65% conversion of A. If the holding time of fluid in this reactor is 0.5 min, then find out the spacetime in minutes. (Assumption, immediate expansion of fluid element)
Correct
Incorrect

Question 65 of 65
65. Question
1 pointsFor a liquid phase reaction in a CSTR A →3B. Feed contains 60 mol % A and 40mol % inerts, the expansion factor is ______________.
Correct
For liquid phase reaction expansion factor is zero as liquid is assumed to be incompressible
Incorrect
For liquid phase reaction expansion factor is zero as liquid is assumed to be incompressible
0sincostansin^{1}cos^{1}tan^{1}πex^{y}x^{3}x^{2}e^{x}10^{x}^{y}√x^{3}√x√xlnlog()1/x%n!789+MS456–M+123×M0.EXP÷MR±RNDC=MC 
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