OJEE 2017 Question Paper M.Tech Chemical Engineering

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OJEE 2017
Question Paper ·
M.Tech Chemical
Engineering
EXAM YEAR TYPE SUBJECT

OJEE 2017 Question Paper M.Tech Chemical Engineering

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co m .
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Subject: Chemical Engineering

01. The friction factor for smooth pipes with turbulent flow (NRe = 1 × 106) is nearly equal to

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om . co
A. 0 B. 0.01 C. 0.1 D. 1

02. Froude number can.cbe
e m
em forces a s
expressed as

a s g l
A. l—————— a
Surface Inertia forces

ag
B. ——————
Gravity forces Viscous forces

Inertia forces Viscous forces
C. —————— D. ——————
Gravity forces Surface forces

03. For a fluid flowing in x-direction between two parallel stationary plates at different

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temperatures under steady-state, the correct starting equation to be used for finding out the

.
temperature profile in the situation is

s em
a
∂T ∂T ∂2T
A. vx — + vy — = α (——)
g l
∂x ∂y ∂x2
a
∂T ∂T ∂2T
B. — + vx — = α (——)
∂θ ∂x ∂x2

∂T ∂2T
C. vx — = α (——)

m
∂x ∂x2

m c. o
c. o e m
∂T ∂2T

em
D. vx — = α (——)
la s
s ag
∂x ∂y2

gla 04. Momentum diffusivity is
a A. kinematic viscosity B. dynamic viscosity
C. mass diffusivity/density D. none of above

05. The hydraulic radius of a piece of rectangular cross-section of size ‘a × b’ is

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c. o s e m
m a
se
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(ab)2 a+b ab (ab)2
A. —— B. —— C. —— D. ——
a+b ab 2(a+b) 2(a+b)

06. In forced vortex, the velocity
A. increases with increasing radius B. increases with decreasing radius
C. decreases with decreasing radius D. remains constant with respect to radius

07. NB of a pipe stands for
A. Nominal outer diameter B. Nominal bore
C. Normal bore D. Normal bit size

08. If the cake compressibility coefficient increases for different solids at same pressure, the rate
of filtration
A. increases B. decreases C. remains constant D. varies randomly

09. Grinding efficiency of a ball mill is of the order of
A. 1 – 5% B. 40 – 50%
C. 75 – 80% D. 90 – 95%

10. A particle attains its terminal settling velocity when
A. gravity force + drag force = buoyancy force
B. gravity force = buoyancy force
C. buoyancy force + drag force = gravity force
D. drag force = buoyancy force

11. The angle of nip decreases when coefficient of friction of the material to be crushed,
A. increases B. decreases C. remains constant D. varies randomly

12. You have been given with the following equipment for crushing of solid mass:
(i) Fine crusher (ii) Ultrafine grinder (iii) Coarse crusher (iv) Intermediate crusher.
Select suitable equipment for crushing of solid to obtain particles of 0.5 mm and 1 μm sizes,
respectively.

A. (ii), (iv) B. (iii), (i) C. (iv), (ii) D. (iii), (ii)

13. For a H2SO4 solution of specific gravity 1.5, the concentration in terms of 0Be is
A. 68.42 B. 24.18 C. 48.33 D. 54.82

14. (GCV – NCV) indicates the

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co m .
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A. volatile matter in fuel B. ash content in fuel
C. heat available for heating D. moisture content in fuel

15. Catalyst is used for manufacturing methanol from CO and H2, and the catalyst fouling during
operation is avoided by

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co
A. feeding excess H2 B. maintaining low temperature

om m .
C. maintaining low pressure D. feeding N2 along with the reactants

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16. For which type of the following polymerization reactions, solution polymerization method is
l a
a s
l pressure
usually adopted?
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A.ghigh
aC. highly exothermic B. highly endothermic
D. slow rate

17. Which of the following is used as a raw material for production of pentaerythritol?
A. Ethanol B. Benzene C. Formaldehyde D. Acetone

18. Which one of the following is used in vulcanization of rubber?

m
A. Acetone B. Styrene C. Butanol D. Aniline

c. o
e m is high
19. Deodourization of oil is done under vacuum as

l a s oil
A. boiling point of odour causing components

C. the odour casing componentsgare heat sensitive
a
B. to prevent degradation of heat sensitive

D. to remove hexane readily

20. In the spinnerette operation involved in production of rayon fibre, the major problem is
A. treating acidic pulp B. handling basic pulp
C. foric balancing D. clogging

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21. With increase in temperature for most of the liquids, the thermal conductivity

m c. o
c. o
A. decreases B. increases C. remains constant D. cannot be predicted

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em la s
22. Ratio of heat transfer rate to the rate at which heat would be conducted within the fluid under

las a temperature gradient, is known as
ag
ag A. Reynolds number
C. Prandtl number
B. Nusselt number
D. Grashoff number

23. Identify the heat exchanger out of the following for which the correction factor, FT is
required to be calculated:

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c. o s e m
m a
se
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A. Cross-flow heat exchanger B. Counter-flow heat exchanger
C. Parallel flow heat exchanger D. Mixed flow heat exchanger

24. The range of wave length in the electromagnetic wave spectrum important for radiative heat
transfer is approximately from
A. 10 –7 to 10 –4 B. 10 –9 to 10 –5 C. 105 to 108 D. 10 –1 to 102

25. In a simple evaporator, if one can get the thick liquor’s weight as 50%, then the solvent
evaporated will be
A. 50% B. between 50 to 100% C. < 50% D. 83.33%

26. Which type of multiple-effect evaporator is preferable when viscous liquors are used as feed?
A. feed-forward B. Mixed-feed
C. Feed-backward D. Parallel -feed

27. If a body transmits all radiations incident on it, then it is known as
A. black body B. transparent body
C. white body D. grey body

28. Which of the following effects states that a concentration difference can be created by a
temperature difference?
A. Dufour effect B. Higbie effect C. Soret effect D. Chapman effect

29. Match the approximate mass diffusivity ranges for the following:
(1) Gas (i) 10 – 5 to 10 – 6 cm2/s.
(2) Liquid (ii) 10 – 8 to 10 – 10 cm2/s.
(iii) 0.1 to 1 cm2/s.

A. (1) – (iii), (2) – (i) B. (1) – (iii), (2) – (ii)
C. (1) – (i), (2) – (ii) D. (1) – (ii), (2) – (iii)

30. Minimum liquid rate to be used in a counter-current absorption tower corresponds to an
operating line
A. having a slope of unity B. having a slope of 0.1
C. tangential to the equilibrium curve D. having a slope of – 1

31. The overall mass transfer co-efficient for absorption of SO2 from air using dilute sodium
hydroxide solution can be substantially increased by
A. increasing the gas film co-efficient

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co m .
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B. increasing the liquid film co-efficient
C. increasing the total pressure
D. decreasing the total pressure

32. For high Schmidt number the boundary layer theory predicts that the mass transfer

m
coefficient varies as proportional to

om
B. Dv1/3 C. Dv2/3 D. Dv3/2
. co
m
A. Dv

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33. The mass transfer flux in gases is generally higher than that in liquids in the order of
l a
l a s a g
ag
A. 10 times more B. 100 times more
C. 1000 times more D. 105 times more

34. For solvent economy in liquid-liquid extraction, the distribution coefficient must be
A. less than one B. equal to one
C. greater than one D. as large as possible

35. In a batch drying operation one can get the rate of drying in constant dying period as 2.8 kg
H2O/hr. m2 at an air inlet temperature of 600C with a wet-bulb temperature of 350C. If same

m
c. o B. 3.85 kg. H O/hr. m
air is used at an inlet temperature of 800C and wet-bulb temperature of 380C, the rate of
drying will be
A. 2.8 kg. H2O/hr. m2
s em D. 6.146 kg. H O/hr. m
2

a
2

g l
C. 4.704 kg. H2O/hr. m2 2
2

a
36. Because of tortuous micropores within the membranes, the diffusivity of the gas in the
membrane
A. gets appreciably increased B. gets appreciably reduced
C. remains unchanged D. either (A) or (B)

37. A carbonaceous porous catalyst is used for conversion of nitrogen oxide in effluent air to
carbon monoxide and nitrogen. The catalyst pellet is of radius 4.8 × 10–3 m, while the
m
c. o
effective diffusivity of NO in air in the pores is found to be 4.6 × 10–8 m2/s and the external

m
c. o A. 0.869
mass transfer coefficient to be 5 × 10–5 m/s. The ‘Biot number’ for mass transfer will be

e m3.802
em 38. The activation energy of a bimolecular gas decomposition reaction
B. 1.739 C. 2.017
l s
ais 25,000 cal/mol. The
D.

las g
g fraction of molecules that have sufficient energy to decompose ata30 C will be
a
0

A. 7.29 × 10 – 19 B. 8.07 × 10 – 19 C. 8.98 × 10 – 19 D. 9.27 × 10 – 19

39. Overall order of reaction for which rate constant has units of [(mol/lit)– 3/2. s– 1] is
A. – 3/2 B. 1/2
C. 3/2 D. 5/2

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c. o s e m
m a
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40. For a laminar flow reactor, the expression for C [= dF/dt] considering RTD equation can be
written as
e – t/τ τ2 τ
–t/τ
A. C = — B. C = 1 – e C. C = — D. C = —
τ 2t3 2t2
where ‘F’ represents ratio of volume and volumetric rate.

41. If a negligible temperature difference is observed in between the catalyst pellet centre and the
pellet surface, then
A. pore diffusion does not control
B. pore diffusion controls
C. surface film mass transfer resistance does not control
D. reaction step resistance does not control

42. The assumptions made for the Clausius-Clapeyron equation are
(i) the vapour acts as ideal gas
(ii) applicable near the critical point
(iii) enthalpy of vapourization varies with temperature
(iv) the vapours are real gases
(v) applicable below and away from the critical point
(vi) enthalpy of vapourization is independent of temperature

A. (i), (ii), (iii) B. (i), (v), (vi) C. (iv), (v), (vi) D. (ii), (iv), (vi)

43. The degree of freedom of an azeotropic mixture of ethanol and water in a VLE system is
A. 0 B. 1 C. 2 D. 3

44. For azeotropic formation
A. γ1/γ2 = 1 B. γ1/γ2 = 0 C. γ1/γ2 = P10/P20 D. γ1/γ2 = P20/P10
where γi represents activity coefficient of component ‘i’, and Pi0 represents vapour pressure
of component ‘i’.

45. For a cylindrical pin fin for long fins, the fin efficiency is proportional to
A. L B. 1/√L C. L2 D. √L
where L is the length of fin.

46. The overall plate efficiency of a plate column is the ratio of
A. number of theoretical plates to the number of actual plates required
B. number of actual plates required to the number of theoretical plates

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C. number of actual plates required to the number of overall gas-phase transfer units
D. number of theoretical plates to the number of overall liquid-phase transfer units

47. For steam pipelines with thermal stresses induced in them, the best pipe support is
A. Foundation support B. Spring hanger support

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C. Hanger support D. Roller support

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48. If a pump costs Rs. 2000 in 2010, what will be cost of the pump of same capacity in 2016?
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(Given: In 2010, cost index is 250 and in 2016, cost index is 300)
l a s
l a s D. Rs. 3500 g
a
g
A. Rs. 2400 B. Rs. 2750 C. Rs. 3000

49. If a a
plant producing 4 kton/annum fertilizer costing Rs. 20/kg. is analyzed for a new
proposed plant of double the capacity, find the capital investment for proposed plant.
(Assume turn-over ratio as 1)
A. Rs. 16,000.00 B. Rs. 40,000.00 C. Rs. 1.6 × 104 D. Rs. 1.6 × 108

50. The discount factor is written as the ratio of

m
A. Present worth and Future worth B. Future worth and Present worth
C. Present worth and Premium
. c o D. Premium and Present worth

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inefirst 4 years, the annual depreciation in Rs. /year
the initial plant value is to be depreciated s
a
51. A fully depreciable plant of Rs. 8000,000 has a estimated service life of 20 years. If 40% of

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a
using straight line method will be
A. Rs. 400,000 B. Rs. 800,000 C. Rs. 2000,000 D. Rs. 160000,000

52. LD50 stands for
A. Lethal dose of a toxic chemical in which 50% of test animals survive and remaining die
B. Length to diameter ratio for a pipeline carrying a fluid at a pressure of 50 MPa
C. Legal dose of a toxic chemical in which 50 test animals die

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c. o
D. Length to diameter ratio for a reactor operating at 50 MPa.

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c. o A. Chemical e mThermal
53. If BOD/COD = 1, which of the following methods you will recommend for waste treatment?

em 54. Laplace transform of the function (t e ) using the first shift theoremglisa s
s
B. Biological C. Physical D.

gla a
a
2 2t

25
e 2 2
A. — B. ——— C. 53e35 D. ———
53 (5 – 2)2 (5 – 2)3
55. A proportional controller takes in error signal in temperature range 80 to 2000C and produces
electrical output in standard range of 4 to 20 mA. What will be the gain of the controller?
A. 0.1333 B. 0.2382 C. 0.332 D. 0.3864

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c. o s e m
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56. The rangeability of a control valve is written as
A. maximum controllable flow – minimum controllable flow
B. maximum controllable flow × minimum controllable flow
C. maximum controllable flow + minimum controllable flow
D. maximum controllable flow ÷ minimum controllable flow

57. A process shows the amplitude ratio of 0.2 at a cross-over frequency of 15 rad/s, the ultimate
gain and period of sustained oscillation will be
A. 0.2, 5 B. 2, 0.2488 C. 5, 0.4188 D. 15, 0.2

58. The resistance of thermistors
A. remains constant at any temperature
B. increases with increasing temperature
C. decreases with increasing temperature
D. decreases with decreasing temperature

59. For valve sizing we generally consider the valve half open at the design or normal steady-
state conditions. For designing such a valve if the design pressure drop over the valve is 1.4
atm. for water flowing at 0.02 m3/s and half open area of valve is 0.015 m2, the valve
coefficient, CV will be
A. 0.0746 B. 0.1786 C. 0.1937 D. 0.2014
(Assume density of water at the operating condition as 1000 kg/m3)

60. The time difference by which the output of a PD controller leads the input when the input
changes linearly with time, is called
A. error ratio B. derivative time
C. proportional sensitivity D. gain

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