ISRO question paper, ISRO sample paper, Indian Space Research Organisation, question papers,technical, aptitude, interview pattern, 2009,chemical engineering

1) Special software to create a job queue is called
a) driver
b) spooler
c) interpreter
d) linkage editor
2)When a process is rolled back as a result of deadlock the difficulty arises is
a) Starvation
b) System throughput
c) low device utilisation
d) cycle stealing
3)On receiving an interrupt from an I/O device the CPU
a) Halts for a predefined time.
b) Branches off the interrupt service routine after completion off the current instruction.
c) Branches off to the interrupt service routine immediately.
d) hands over the control of address bus and data bus to the interrupting service.
4) Which of the following is true of the auto increment addressing mode?
1. It is useful in creating sef relocating code.
2)If it is induced in an instruction set architecture , than an additional ALU is required for effective
address calculation.
3) The amount of increment depends on the size of the data item accessed.
a) 1 only.
b)2 only
c) 3 only
d) 2 and 3 only
5) The primary purpose of an operating system is
a) To make the most efficient use of the computer hardware.
b) to allow people to use the computer.
c) To make the system programmers employed.
d) to make computers easy to use.
6)consider the cpu intensive processes which require 10,20,30 time units and arrive at time 0,2,6
respectively.how many context switches are needed if the operating system implements a shortest
remaining time first scheduling algorithm?Do not count the context switches at the time 0 and end.
a) 1
b) 2
c) 3
d) 4
7) consider a system having n resources of the same type.These resources are shared by 3 processes
A,B,C .These have peak demands of 3,4,6 respectively.For what value of n deadlock won't occour.
a) 15
b) 9
c) 10
d) 13
8) In which addressing mode the effective address of the operand is computed by adding a constant
value to the content of the register?
a) absolute mode.
b) indirect mode
c) immediate mode
d) index mode
9)the process of organising the memory into two banks to allow 16 bit and 8 bit data operation is called
a) bank switching
b) indexed mapping
c) two way memory interleaving
d) memory segmentation
10)a one dimensional array A has indices 1-75.Each element is a string and takes up three memory
words. The array is stored in location 1120 decimal. The starting address of A[49] is
a) 1267
b) 1164
c) 1264
d) 1169
11) The micro systems stored in the control memory of a processor have a width of 26 bits. Each
microinstruction is divided into three fields : a microoperation field of 13 bits, a next address field(X),
and a MUX select field(Y). There are 8 status bits in the inputs of the MUX.How many bits are there in
the X and Y fields and what is the size of the control memory in number of words?
a) 10,3,1024
b) 8,5,256
c) 5,8,2048
d) 10,3,512
12)The use of multiple register windows with overlap causes a reduction in the number of memory
accesses for
1.function locals and parameters
2. register saves and restores.
3. instruction fetches.
a) 1 only
b) 2 only
c) 3 only
d) 1,2,and 3
13)Which of the following about relative addressing mode is false?
a) it enables reduced instruction size.
b) it allows indexing of array element with same instruction.
c) it enables easy relocation of data.
d) it enables faster address calculation than absolute addressing.
14)Substitution of values for names (whose values are constants) is done in '
a) local optimisation
b) loop optimisation
c) constant folding
d) strength reduction
15)A root a of eq f(x)=0 can be computed to any degree of accuracy if a good initial approximation x0
is chosen for which
a) f(x0)>0
b) f(x0)f''(x0)>0
c) f(x0)f''(x0)<0
d) f''(x0)>0
16) consider the polynomial p(x)=a0+a1x+a2x*x+a3x*x*x. The mininum number of multiplications needed to evaluate p on an input x is
a) 3
b) 4
c) 6
d) 9
17)Activities which ensure that the software that has been built , is tracable to customer is covered as
part of
a) verification
b) validation
c) maintenance
d) modelling
18) A testing method which is normally used as the acceptance test for a software system is
a) regression testing
b) integration testing
c) unit testing
d) system testing
19)A locked database file cab be
a) accessed by only one user
b) modified by the users with the correct password.
c) used to hide the sensitive information.
d) updated by more than one user

ISRO sample paper, Indian Space Research Organisation, question papers,technical, aptitude, interview pattern, chemical engineering

1 The concept of ---------------------------------- derived from the “ZEROTH LAW OF THERMODYNAMICS”.
TEMPERATURE

2 The concept of ------------------------------------- derived from the “SECOND LAW OF THERMODYNAMICS”.
ENTROPY

3 The expression for isentropic index [?] in terms of number of degrees of freedom

( n ) ------------------------
1+ [ 2 / n]

4 The critical Reynolds no upto which the viscous flow exists in pipe -------------------
2000

5 Two forces of equal magnitude P acts at right angles to each other and having same directions. Find out the expression for their resultant [R ]--------------------
[2]½ P

6 The angular frequency of handclock------------------
?/30 rad/s

7 The equation for free torsional vibration----------------------------
[1/2?] [q/I]½


8 A thin cylinder is subjected to longitudinal stress s0 and internal pressure P , findout the maximum shearstress developed in it [ q max] ------------------------
0.5 s0

9 Rate of moment of momentum is equal to the -------------------------
Torque applied by the body

10 The expression for loss of energy [he ] due to sudden enlargement of the pipe--------
he =[v1-v2]²/2g

11 A spring of stiffness K is divided into “n” number of springs. Each spring having stiffness ---------------------------
nK

12 The non-dimensional number corresponds to
[inertia force\compressibility force]½------------------------------ Euler number

13 Equation for forced vortex flow-----------------------------
v/r = constant

14 The causes of cavitation
Metallic surfaces are damaged
Noise & vibrations

15 How to increase the thermal efficiency in Carnot cycle by-------------------------------
Decreasing low temperature

16 The slenderness ratio in columns can be obtained from the ---------------
Least radius of gyration

17 50:1 gear reduction ratio possible in-----------------
worm gear

18 Wire drawing property named as -------------------------
ductility

19 One man is standing in the elevator and the elevator is moving in the upward direction. What type of reading regarding the weight of man will we get from gauge---------------
The weight of man shown by the gauge will more the actual weight of the man.

20 LMTD for counterflow heat exchanger is compared to parallel to heat exchanger-----
More

21 The free damping equation 2yºº + 3yº +8y =0. Calculate damping factor (D.F )--------
3/8



22 The discharges for the two parallel pipes of same lengths are Q1 & Q2 respectively and their diameters are 200 mm & 800 mm respectively. Calculate the ratio of discharge of smaller pipe to larger pipe.
1/32

23 A compressor is used to compress the air from 5 bar to 10 bar .Calculate its critical pressure [ P?]----------------------
2.64 bar

24 Equivalent twisting moment------------------------------
Te = [T² + M²]½

25 The shear stress distribution in pipe flow -----------------------------
Centre is zero and linearly varying from the center to the wall

26 The irrational component in x-y is--------------
dv/dx = du/dy

27 The ratio kinetic viscosity/thermal diffusivity is -------------
Nusselt Number

28 The cylinder is subjected to insulations K & 2K at the outside surface to avoid heat transfer. In order to arrest heat transfer effectively , which insulation should be provided first at the outer surface?
2K & K respectively

29 The wall having conductivities
K1 K2

Findout the equivalent conductivity of the material--------------------?

29 The maximum amplitude in this vibration equation y = 6 sin?t --------
6

30 The thermal boundary layer in an ideal fluid flow is --------------
0

31 What does tend to stagnation point -----------------------
The velocity is 0 at the stagnation point due to the increase in pressure energy from the conversion of K.E into P.E.
32 Match the following:
i. subsonic nozzle : figure
ii. Supersonic nozzle : figure
iii. Subsonic diffuser : figure
iv. Centrifugal compressor : figure

40 Cold working of metal increases ----------------------
Tensile strength

41 The power absorbed in belt drive depends on-----------------------
Tension in tight side, Tension in slack side, coefficient of friction & Radius of pulley.

42 The temperature loss related -------------- hysteresis loss

43 The convergent pipe having entry and exit diameters are 100 and 50 mm respectively, find out their velocity ratio from entry to exit…………..
1/4

44 They had given one composite circular pipe having 4 varying cross sections . They are 2D, 1.5D, 4D & D respectively. The water is entering at velocity V at section 1 and leaving at section 4. Find out the pressure decreasing order……………
P4>P2>P1>P3

45 The bulb having weight 150N supported by two ropes and attached to the walls having angles 45º & 60º. Findout the reaction forces in the ropes ?
This is related to Lamis theorem
46 A hollow sphere of radius r . A particle is moving with coefficient of friction 1/[3]½ inside the sphere from wall . which height will it become rest?

47 The disc is resting on the rough wall by a rope tied at the center . The rope makes angle with the wall around 30º. The tension in the string is ----------than the weight of the disc. more

48 A railway wagon containing partially full of water. Which angle----------------

49 Findout the graph between discharge [Q] in the x-axis and head [H] in the y-axis----------

50 In welding pitch dimension is limited to----------------------

51 The composition of inconel alloy-------------------

52 There is a heat transfer between two walls having thickness and conductivities k1 & K2 respectively. The linear temperature profile of first wall is more steeper than the second wall . Findout the ratio K1/K2 ---------------------
a) >0 b) <0 c)=0 d) the given data is insufficient

53 The max shear stress developed in solid circular shaet is 100 MPa . Calculate the max normal stress developed in it? ??????



54 This question related to welding -------------

55 Bearing liner-------------------------
a) Babbit metal b) Gun metal

56 Electrical resistance material --------------Nichrome

57 This question related to radiation

58 A sun emits 1150K at 0.5µ. A furnace emits 300k from small door --------------

59 In the simple pendulum , the maximum amplitude depends on ------------------- increase in length

60 The fuel flow increases if-------------------------
a) exhaust valve burnt b) filter choke c) silencer choke

61 The jet propulsion depends on-------------
a) jet velocity b) weight ratio

62 What is the condition for perfect frame-------------------------------------

63 Depth of cut can be increased by-----------------------



64 The workpiece can be held in-----------------

65 This is related toNucleate boiling

66 What is the expression for Reynolds number in terms of diameter of the pipe…………..Re =?VD/µ

67 Air conditioning means---------------
a) cooling & heating b)dehumidifying c) removing impurities from air d)all

68 Fibrous fracture occurs in ------------------------
a)brittle fracture b) ductile fracture c)shear fracture d)none

69 In laser beam machining , the workpiece should be--------------
a)absorbed by all the rays b) reflected by all the rays

70 Foam and coke are good insulators. Why?-----------------------
a)less density b)

71 Gold property------------------
a)good conductor b)good insulator


72 In lathe , the workpiece can be held in --------------------------------------
a) live center b)steady rest c)3-way chuck d)4-way chuck


INTERVIEW PATTERN:I. Project ExplanationII. Fluid Mechanics:i. Define laminar flow & Turbulent flow
ii. What is the value of Reynolds no in pipe flow
iii. What is the significance of Reynolds no
iv. Head losses in pipe
v. Define boundary layer in pipe flow & thickness of boundary layer
vi. What is the variation of d in laminar & turbulent flow
III. Strength of materialsi. Draw the figure for spring damper system
ii. Differential equation for spring damper system
iii. Find out the deflection of spring damper system
iv. Define stiffness and unit of stiffness
IV. Material Sciencei. Ferrous materials
ii. Non-ferrous materials
iii. Define fatigue
iv. Define fatigue resistance?
v. Curve for fatigue
vi. Fatigue limit

IFS Chemical Engineering question paper, 2005, Indian Forest Service, test papers

SECTION A

1. Answer any four of the following:(a) Find the first-order rate constant for the disappearance of A in the gaseous reaction 2A → R, holding the pressure constant, the volume of the reaction mixture starting with 80 per cent A decreases by 20 per cent in 3 mm. (10)

(b) A solution contains 50 per cent benzene, 30 per cent toluene and 20% xylene by weight at 100° C. The vapours are in contact with the solutions. Calculate total pressure and mole per cent composition of liquid and vapour: (10)

(c) Show that the internal energy of an ideal gas is a function of temperature only. (10)
(d) For adiabatic batch reactor, derive an expression to determine the time required to achieve a desired conversion. (10)
(e) Define Bubble point and Dew point. Explain in detail how to calculate bubble point or dew point of given binary mixture. (10)
2. The elementary reaction. A + B → R + S is effected in a set up consisting of a mixed reactor into which two reactant solutions are introduced followed by a PFR. A large enough of excess of B is used so that the reaction is first order w.r.t. A. It is proposed to reverse the order of two units. How does this change affect the conversion? (40)
3. A high purity limestone is burnt in a lime kiln which is fired externally with a coal containing 75.5 per cent C, 5.5 per cent H, 1.6 per cent N, 1.1 per cent S, 7.6 per cent and rest ash. The stack gas analysis is 20.2% CO2, 7.1% O2 and rest N2, Calculate-
(a) kg limestone burnt/kg of coal;
(b) excess air used for combustion. (40)
4. One mole of an ideal gas initially at P1 and T1 is compressed reversibly and adiabatically till the pressure is P2 and then it is cooled at constant volume to the initial pressure, finally the gas is restored to the initial state through an isobaric process. Calculate the work done by the process. (40)

SECTION – B

5. Answer any four of the following:(a) Define depreciation. What are the different methods for determining depriciation? Explain the method, sum of the years digit method. (10)
(b) Explain briefly the factors to be considered for the location of a chemical plant. (10)
(c) Describe the manufacture of caustic soda by either diaphragm or mercury cell process. Discuss the pollution aspects of this industry. (10)
(d) Explain briefly the pollutants emitted from a tanning industry. (10)
(e) Explain the cracking and polymerisation of petroleum fractions. (10)
6. (a) Explain the break-even analysis and its equation. (10)
(b) A Project can produce 12000 units per year at 100 per cent capacity. The variable cost per unit is Rs. 3 at 100 per cent capacity. Fixed costs are Rs. 10,000 per year. Find the break-even point if the selling price is Rs. 5/ unit. Now the manufacturer finds that he can sell only 80% at Rs 5/ unit. How much should he charge for additional units if he brings production upto 100 per cent capacity and increases profits after taxes by an additional amount of Rs. 1,000? Use tax rate for the above problem 52 per cent. . (30)
7. (a) Describe the process with neat flow sheet of the manufacture of ethyl alcohol. (30)(b) Discuss the applications of following products: (10)
(i) Enamel paint (ii) Rancidity.
8. (a) Discuss the methods possible for preventing various industrial hazards. (20)(b) Explain primary treatment method of waste-water treatment. (20)

IFS Chemical Engineering question paper, 2007, Indian Forest Service, test papers

SECTION A

1. Answer any four of the following (Maximum 150 words):
(a) Discuss reversible thermodynamic processes.
(10)
(b) Write short note on fugacity.
(10)
(c) Write short note on reactors in series.
(10)
(d) A solution of naphthalene, C10H8, in benzene, C6 H6, contains 25 mole per cent of
naphthalene. Express the composition of the solution in weight percent.
(10)
(e) A solution of Sodium Chloride in water contains 230 grams of NaCl per liter at 20°C. The
density of solution at this temperature is 1.148 grams per cubic centimeter, calculate :
(i) Volumetric percent of water
(ii) Composition in mole percent
(iii) Modality.
Note : density of water at 20° C = 0.998 g/cc.
2. (a) The liquid phase reaction,
(where K1=8 liter/mol.min
K2=3 liter/mol.min)
is carried out in 150 litre stirred tank reactor under steady state conditions. Reactants A and B
are fed to the reactor at equal volumetric flow rates. The concentrations of A and B streams
are 2.8 mole A/ litre and 1.6 mole B/litre. What should be the flow rate of each stream to get
75% conversion of the limiting reactant?
(25)
(b) Prove that the heat transferred equals the enthalpy change of the system for a mechanically
reversible, constant-volume, constant-pressure, non- flow processes.
(15)
3 (a) A steel casting [Cp = 0.5 kJ kg-1 K-1] weighing 40 kg and at a temperature of 450°C is
quenched in 150 kg of oil [Cp = 2.5 kJ kg-1 K-l at 25°C. If there are no heat losses, what is the
change in entropy of :
(i) the casting,
(ii) the oil and
(iii) both considered together? (25)
(b) Derive the expression for the design equation of tubular reactor. (15)
4. (a) One litre/mm of liquid containing A and B [CA0 = 0.10 mol/litre, CBO =0.01 mol/litre] flow
into a mixed reactor of volume of one litre. The materials react in a complex manner for
which the stoichiometry is unknown. The outlet streak from the reactor contains A, B and
C(CAf = 0.02 mol/litre, Cbt= 0.03 mol/litre, Ccf = 0.04 mol/litre). Find the rate of reaction of
A, B and C for the conditions within the reactor. (20)
(b) Chlorobenzene is nitrated using a mixture of nitric acid and sulphuric acid. During the pilot
plant studies, a charge consisted of 100 kg chlorobenzene (CB), 106.5 kg 65.5% (by weight)
nitric acid and 108 kg 93.6% (by weight) sulphuric acid. After two hours of operation, the
final mixture was analysed. It was found that the final product contained 2% unreacted
chlorobenzene. Also the product distribution was found to be 66% p-nitrochlorobenzene and
34% o-nitrochloro benzene, calculate:
(i) The analysis of charge
(ii) The percentage conversion of chlorobenzene.
(20)

SECTION B

5. Answer any four of the following in brief (Maximum 150 words):
(a) PERT
(10)
(b) Break-even analysis
(10)
(c) Biogas
(10)
(d) Essential oils
(10)
(e) Norms for air emission.
(10)
6. Describe manufacture of ammonia giving neat flow diagram and discuss its major pollution
problems.
(40)
7. (a) Suggest and justi1’ a location for a soda ash plant.
(20)
(b) Discuss greenhouse effect.
(20)
8. (a) Discuss cracking in brief.
(20)
(b) The original value of a piece of equipment is Rs. 22,000. Its salvage value is Rs. 2,000 at the
end of service life of 10 years. Determine the book value of the equipment at the end of 5
years using:
(i) Straight-line method
(ii) Textbook declining-balance method
(iii) Double declining-balance method.

IFS Chemical Engineering question paper, 2004, Indian Forest Service, test papers

SECTION A

1. Answer any four of the following (10 x 4 = 40)
(a) (i) What is time dependent flow ? With the help of this phenomenon, explain the meaning of Thixotropic liquid and Rheopeptic substances.
(ii) Write the power law equation for dilatant and pseudo plastic fluids, and explain the terms ‘flow consistency index’ and ‘flow behaviour index’.
(b) Derive an equation for steady conduction in the radial direction of a hollow cylinder. From the equation, explain the term log-mean radius. Under what condition, can the log-mean radius be replaced by arithmetic mean radius?

(c) In a double pipe heat exchanger, a hot fluid is cooled from 150 to 100°C by using cold water, which is heated from 30 to 50°C. Derive a suitable expression to prove that there is a distinct advantage of using the exchanger in counter-current flow over that of using it in parallel flow.

(d) Explain how thermal condition of feed influences the liquid or vapour flow rate around the feed plate of a rectification column. What common factor can be used for characterizing five different feed conditions? From the value of this common factor, explain the meaning of horizontal and vertical feed lines.

(e) Explain the phenomenon of primary nucleation in the process of crystallization, and illustrate the difference between homogeneous and heterogeneous nucleation.

2. (a) For an incompressible fluid, write the Bernoulli equation for fractionizes flow. What correction would you apply for incorporating fluid friction? Explain the difference between skin friction and form friction. (10)

(b) What is terminal velocity? Write the equation for terminal velocity for the flow of a single particle through a fluid under the action of (i) gravity and (ii) centrifugal force. How is the equation for terminal velocity under free settling condition modified for hindered settling conditions? (10)

(c) What is a ball mill? Derive an equation for the critical speed of a ball mill. (10)(d) What is a venture meter? Describe the principle of working of a venture meter and write an expression for the venture coefficient. (10)

3. (a) An air water system has a dry bulb temperature of 65.5°C and a wet bulb temperature of 54.5°C.
(i) If the air is cooled to 37.8°C, what per cent of the moisture will condense?
(ii) If the air is again heated to 65.5°C, how much heat will be required per kg of dry air? Specific heat of air = 0.23 kcal/ (kg 0C). (10)
(b) A spherical particle of ethanol of 10 mm diameter is evaporating in an air stream at 26°C. The thickness of the stagnant air surrounding the particle is 1.5 mm. Vapour pressure of ethanol at 26°C is 60 mm Hg and the mole fraction of ethanol in the main stream of the air is 0.005. The diffusion coefficient of ethanol in air is 1.04 × 10-5 m2/sec and the value of R is 82.06 × 10-3 m3 atm/kg mole. Determine,
(i) The mole fraction of ethanol at different positions across the stagnant layer.
(ii) Rate of evaporation of the particle per second. (10)
(c) What are different types of packing that are used in an absorption tower? Explain a simple procedure for calculating the height of a packed tower for absorption of a single component from a gas mixture. (10)
(d) What is critical moisture content? Describe the method for drying of a wet solid before it reaches the critical moisture content. (10)
4. (a) Develop a relation between heat transfer and fluid friction by using the Reynolds’s Analogy. (10)
(b) (i) What is a radiation shield? How does it help in reducing radiant heat loss?
(ii) A double walled spherical container is used for storing liquid oxygen. The diameter of the inner and outer walls of the container is 30 cm and 36 cm, respectively. The surfaces of both the spheres are plated, so that their emissivity is 0.05. Determine the rate at which oxygen will evaporate at -183°C, when the outer wall of the sphere ismaintained at 20°C. Latent heat of evaporation of oxygen is 57.2 kcal/kg. (5 + 5)

(c) What are drop wise and film wise condensation? Mention the conditions that favour drop wise condensation. Describe how the heat transfer coefficient in a vertical condenser is influenced by the height of the condenser. (10)

(d) What is effectiveness of a heat exchanger? Derive a relation between the effectiveness and number of transfer units for a countercurrent heat exchanger. (10)

SECTION B

5. Answer any four of the following (10 × 4 = 40)(a) What are the relative advantages and disadvantages of the proportional, integral and derivative control actions? What are their characteristic effects on the closed loop response for a process?

(b) Explain briefly the essential elements of a computer controlled process system.
(c) What is reverse osmosis? How can it be used for the separation of a solute from an aqueous solution?
(d) What is molecular distillation? With a neat sketch describe the working of a molecular distillation unit.
(e) Discuss how wind load is taken care of in the design of a tall vertical vessel.
6. (a) Illustrate the principle of separation of gases by using non-porous membrane. (10) (b) Discuss about electrolytic regeneration of mixed bed ion exchange resins. (10)
(c) Explain the process of diffusion dialysis and mention its applications. (10)
(d) What are absorption and extraction type separation processes? Illustrate them with examples. (10)
7. (a) Discuss how to find the frequency response of a proportional + integral controller, (10)(b) Explain how a strain gauge is used for pressure measurement. (10)(c) Illustrate the process of feed forward control. (10)(d) Write a relationship that will give the molar or specific enthalpy of a multi-component liquid at temperature T, with known composition for N components. What are the principal control considerations that affect the scope of mathematical modeling of a chemical process? (10)

8. (a) Illustrate the method for the design of a conical head of a cylindrical pressure vessel. (10)
(b) Discuss about major loads and subsidiary loads that must be considered for the design of a pressure vessel. (10)
(c) What are skirt supports? Discuss the method for calculating the thickness of a skirt support. (10)
(d) Discuss the method for calculating the thickness of the shell of a thin wall pressure vessel. (10)

IFS Chemical Engineering question paper, 2006, Indian Forest Service, test papers

SECTION A

1. Answer any four of the following (in 150 words, maximum)(a) Discuss about proximate analysis of coal. (10)
(b) Discuss about Mollier diagrams. (10)
(c) An aqueous solution contains 40% Na2CO3 by weight. Express the composition in mole per cent. (10)
(d) A natural gas has the following composition, in volumetric per cent: Calculate:-
(i) Composition in mole per cent.
(ii) Composition in weight per cent. (10)
(e) Discuss the mathematical statement of second law of thermodynamics. (10)
2. (a) Mono-chloroacetic acid (MCA) is manufactured in a semi batch reactor by the action of glacial acetic acid with chlorine gas at 373 K in the presence of PC13 catalyst. MCA thus formed will further react with chlorine to form dichloroacetic acid (DCA). To prevent the formation of DCA, excess acetic acid is used. A small-scale unit, producing 5000 kg/d MCA, requires 4536 kg/d of chlorine gas. Also, 263 kg/d of DCA is separated in the crystallizer to get almost pure MCA product. Find the % conversion, % yield of MCA and selectivity. (25)

(b) Discuss about the heat of reaction. (15)

3. (a) For the reaction A → R, K = 0.02 min. It is desired to produce 4752 g moles of R per 10 hours a day and 99% of A entering the reactor is to be converted in a batch reactor. To charge the reactor and heat it to reaction temperature requires 0.26 hours. To discharge the reactor and to prepare it for the next run takes 0.9 hours. Calculate the volume of the reactor required. Pure A with molar density of 8 g mole per liter is charged to the reactor. (25)

(b) Discuss about phase rule. (15)

4. (a) Discuss ideal solution and its properties. (20)(b) Derive an expression for design equation for an ideal batch reactor. (20)

SECTION B

5. Write short notes on any four of the following (in 150 words, maximum)(a) PVC (10)
(b) Principles of piping layout (10)
(c) Coal chemicals (10)
(d) Alternative investments (10)
(e) Effects of air pollution (10)
6. (a) Describe the manufacture of penicillin using fermentation route. (20)(b) List the mathematical methods for profitability evaluation and describe any one. (20)
7. List various environmental protection laws and give the main features/provisions of any four in brief. (40)
8. (a) Discuss the estimation of capital investment. (20)(b) Discuss petroleum refining briefly. (20)

IFS Chemical Engineering question paper, 2005, Indian Forest Service, test papers

SECTION A

1. Answer any four of the following (4 x 10 = 40)
(a) What is Bernoulli equation? Determine it for the flow of a compressible fluid in a pipeline.(b) Discuss, with the help of a sketch, the principle of steam jet ejector for creating vacuum.(c) Explain the mechanism of heat transfer in nucleate pool boiling of liquids.(d) Discuss penetration theory of mass transfer. How does it differ from surface renewal theory?(e) Describe the construction and working of a Swenson-Walker crystallizer.
2. (a) Discuss differential and cumulative methods of screen analysis. (10)(b) Explain the construction and operation of a plate and frame filter press. (10)(c) What is area meter? Explain its operation. (10)(d) Determine an expression for terminal velocity of solid particles settling freely in a fluid stream. Modify the above expression for the case of hindered settling. (10)

3. (a) Differentiate between free and forced convection. Describe the procedure to calculate heat transfer coefficient under free convection. (10)(b) Explain effectiveness of a heat exchanger. Obtain its expression for a parallel flow heat exchanger in terms of NTU and capacity ratio. (10)(c) Discuss the effect of boiling point elevation on the capacity of an evaporator. (10)(d) Define emissivity of a body. How is it related to absorptivity? (10)
4. (a) Derive Rayleigh equation for differential distillation of a binary system. (10)(b) Discuss pressure drop characteristics of packed columns and explain the significance of flooding point. (10)(c) Explain the mechanism of moisture movement during drying of a solid. (10)(d) Briefly explain the construction and operation of a packed extraction tower. (10)

SECTION B

5. Answer any four of the following (4 x 10 = 40)(a) Explain the concept of cross flow micro filtration along with its advantages over conventional filtration.
(b) Name various types of heads commonly used in cylindrical vessels. Draw their sketches and list areas of applications.
(c) Mention stepwise procedure for the design of a torispherical head for a cylindrical vessel.
(d) What is final value theorem? How is it used to determine response of a system? Explain it with suitable examples.
(e) Discuss cascade control and its application in process industries.

6. (a) Describe procedure of immersion precipitation process for the production of membranes. (10)
(b) Explain, with the aid of a sketch, the working of an electro dialysis. (10)(c) What is pervaporation? Explain it with the help of a neat sketch and also indicate areas of its application. (10)(d) Discuss ion-exchange separation process for the demineralization of water. (10)
7. An autoclave of 7.9 m3 volume capacity has ellipsoidal heads (major to minor axis ratio = 2:1) at its top and bottom ends. The autoclave is subjected to a maximum pressure of 8 MN/m2. The allowable stress of the material (carbon steel) is 1040 MN/m2. Weld joint efficiency is 85 per cent. Determine optimum dimensions of the autoclave if the following cost ratios are applicable:
(a) The cost of fabricated shell is estimated to vary inversely with D”4 where D is the inside diameter of the autoclave.
(b) The fabricated cost of top and bottom heads per unit weight is 1.5 times the fabricated cost of shell per unit weight. A 12 mm plate is available in store. Check if it can be used for the fabrication of shell of the autoclave. Alternatively, suggest the suitable thickness of plate required for the fabrication of shell of the autoclave. (40)

8. (a) What are phase margin and gain margin? Discuss their utility in control tunnings. (10)(b) Discuss procedure for plotting of open loop transfer function by root locus method. (10)(c) How do you measure liquid level if the liquid contains suspended solid particles? Suggest measuring instrument along with the principle of working. (10)(d) Explain elements of a computer control system. (10)