Karnataka PGCET 2017 Question Paper Chemical Engineering

POST GRADUATE COMMON ENTRANCE TEST-2017
DATE and TIME COURSE SUBJECT
ME/M.Tech/M.Arch/
01-07-2017 CHEMICAL
courses offered by
2.30 p.ni. to 4.30 p.m. ENGINEERING
VTU/UVCE/UBDTCE
MAXIMUM MARKS TOTAL DURATION MAXIMUM TIME FOR ANSWERING
100 150 Minutes 120 Minutes
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Marks Distribution
PART-I : 50 QUESTIONS CARRY ONE MARK EACH (1 TO 50)
PART-2 : 25 QUESTIONS CARRY TWO MARKS EACH (51 TO 75)

CH-A1 11 wi 11111111111111

CHEMICAL ENGINEERING
PART —1
Each question carries one mark. (50 x 1 = 50)

1. All spontaneous processes are 4. C p — C, = R is valid for

(A) Irreversible
(A) Gases at a very low temperature
(B) Reversible
(B) Gases at very high temperature
(C) Adiabatic
(C) Ideal gas
(D) Isothermal
(D) Real gas

2. First law of thermodynamics deals
with
5. Work done is a
(A) Direction of energy transfer
(A) Property of the system
(B) Reversible process only
(B) Path function
(C) Irreversible process only
(C) Point function
(D) Isothermal process
(D) State description of a system

3. Equation which relates pressure,
volume and temperature of gas is
6. Gain Margin is equal to
called

(A) Gibbs — Duhem equation (A) Amplitude ratio

(B) Equation of state (B) Reciprocal of Amplitude ratio

(C) Ideal gas equation (C) Gain of P-D controller

(D) Real gas equation (D) Gain of steady state process

CH 3 A-1

7. A control system is said to be stable 10. In second order underdamped system

(A) If it exhibits an unbounded (A) Decay Ratio — Overshoot
response to a bounded input

If its output response is (B) Decay Ratio = (Overshoot)2
(B)
unbounded for all unbounded
input (C) Overshoot increases for increasing
damping co-efficient.
(C) If it exhibits an bounded
response to a unbounded input (D) Overshoot decreases for increasing
damping co-efficient.
(D) If its output response is bounded
for all bounded input

11. Which of the following is a controlling
8. The transfer function of a first order factor in very fast heterogeneous
system is reaction ?
S
(A) (A) Heat and mass transfer effects
TS + 1
(B) Temperature
(B)
TS 1- 1
(C) Pressure
(C)
TS ± (D) Composition of reactant

1
(D)

12. Rate determining step in a reaction
consisting of a number of steps in
9. When the damping co-efficient of the series is the
second order system is less than 1, it is
called (A) Fastest step

(A) under damped system (B) Intermediate step
(B) over damped system
(C) Un-predictable step
(C) critically damped system
(D) Slowest step
(D) vibrating system

A-1 4 CH

13. Half life period of a chemical reaction 16. Oxygen percentage by weight in
is atmospheric air is

(A) The time required to reduce the (A) 79
concentration of the reacting
substance to half its initial value.
(B) 23
(B) Half of the space time of a
reaction. (C) 21

(C) Half of the residence time of a (D) 29
reaction.

(D) Double of the residence time of a
reaction.
17. A gaseous fuel in order to develop
luminosity on burning must contain

14. With increase in temperature, the
(A) Carbon monoxide
equilibrium conversion of a reversible
exothermic reaction
(B) Hydrocarbon
(A) Increases
(C) Hydrogen
(B) Remains unaffected

(C) Decreases (D) Oxygen

(D) Decreases linearly with
temperature
18. Combustion of pulverised coal as
compared to that of lump coal
15. The reaction in which rate equation
corresponds to a stoichiometric (A) Develops a non-luminous flame
equation is called
(B) Develops a low temperature
(A) Parallel reaction flame
(B) Autokinetic reaction
(C) Can be done with less excess air
(C) Elementary reaction
(D) Provide a lower rate of heat
(D) Non-elementary reaction release

C11 5 A-1

19. Incomplete combustion of fuel is 22. Pitot tube is used to measure velocity
characterized by head of
(A) Still fluid
(A) Smoke formation
(B) Turbulent flow
(B) High flue gas temperature
(C) Laminae flow

(C) High percentage of oxygen in (D) Flowing fluid
flue gas

(D) High carbon monoxide content 23. Non-uniform flow occurs when
in flue gas (A) Direction and magnitude of
velocity at all points are

20. — 40 °C is equal to (B) Velocity of successive fluid
particles, at any point is same at
(A) + 40 °F successive periods of time.
(C) Magnitude and direction of
(B) — 40 °F velocity do not change from
point to point in the fluid.
(C) 39 °F
(D) Velocity depth, pressure, etc.
change point to point in the fluid
(D) — 39 °F
flow.

24. The loss of head due to sudden
21. A fluid in equilibrium means
expansion of a pipe is

(A) its viscosity is zero. V 1 2 — V,2
(A) h —
(B) shear stresses are acting on the
fluid but no flow behaviour is 0.5\71 2
manifested. (B)
2g

(C) it is free from shear stresses. (V1 — V2 )2
(C) h L—
2g
(D) a .hypothetical situation because
fluids are never in equilibrium. (D) h L = (V1 — V,) / 2g

A-1 6 CH

25. The work done by impeller of a 28. Screen having maximum capacity is
centrifugal pump on water per second (A) Grizzles
per unit weight of water is given by
(B) Trammels
1 (C) Shaking screen
(A) — V ti p
g
(D) Vibrating screen

(B)V Ul
g "2 29. Compressibility co-efficient for an
absolute compressible cake is
1
(C) g (V‘3,, u, — V u )
— (A) 0
(B)
(D) uig
(C) 100
(D) infinite

26. Horse power required for a roll
30. A sphere settles freely through a pool
ceusher is directly proportional to
of liquid and the settling is in Stoke's
law range. The terminal velocity of
(A) Reduction ratio
sphere will
(B) Size of product (A) Be independent of the liquid
viscosity
(C) Motor size
(B) Increases linearly with viscosity
(D) Size of feed (C) Decreases linearly with viscosity
(D) Decreases inversely with the
square of viscosity

27. Length to diameter ratio of a ball Mill
is usually around 31. Provision of fins on a given heat
transfer surface will be more if there
(A) 0 — 25 are

(B) 1 — 1.5 (A) fewer number of thin fins
(B) fewer number of thick fins
(C) 10
(C) large number of thin fins
(D) 100 (D) large number of thick fins

CH 7 A-1

32. Rate of heat conduction through a 35. In natural correction, nusselt number is
thick sphere (Q) of radius r and r, is a function of
equal to (A) Reynold's Number & Prendtl
Number
471k (t 1 —t,)
(A) (B) Grashoff's Number & Prendtl
-r i
Number
(C) Prendtl Number
(B)
(D) Froude Number & Reynold's
Number
47tk r l r2 t2 )
(C) (r, r1 )
36. The Z-component of the total mass
471r r
'I' 2 flux of a component A in a binary
(D)
(t 1 —1,) mixture of A and B is given by
(CA
CA (NAz + N Bz )— DAB
aZ
33. Ratio of heat transfer co-efficient to
the flow of heat per unit temperature (7CA
CA (NAz + NB7)+ DAB
rise due to the velocity aZ

(A) Stanton Number aCA
--DAB
(B) Prandtl Number ez
(C) Grashoff's Number (D) - -( + N,,,)
(D) Mach Number

37. Adsorption of gases on solids
34. Fouling Factor is used
(A) Increases with increasing
(A) in heat exchange design as a temperature.
safety factor
(B) Decreases with increasing
(B) In case of Newtonian fluids temperature.

(C) When liquid exchanges heat with Decreases with increasing
gas pressure.

(D) Pressure drop calculation (D) Remains constant with
increasing temperature.

A-1 8 CH

38. For the nth try (counted from the top of 41. Secondary Nutrients in fertilizers are
a distillation column) the murphee try
(A) Boron, Copper, Manganese
efficiency is defined by
(B) Calcium, Molybdenum, Zinc
(A) —

Yn I (C) Iron, Sulphur, Molybdenum

(D) Calcium, Magnesium, Sulphur
Y —Y„
(B)
Y—
42. Raw materials for production of urea
Y „ — Y„,
(C) are
— Y,,
(A) Carbon dioxide and brine
Y —Y
(D) " (B) Carbon dioxide and Ammonia
Y., Yi,
(C) Carbon disulphide and ammonia

(D) Carbon disulphide, brine and
39. Lewin Number = 1 signifies ammonia
(A) N pi' = N SC

(B) N SA.: = N Re 43. Crude oil is made up mainly of

(A) Alkanes, Cycloalkanes and
(C) Npr= N I2e
Aromatics ties
(D) Nst• N pr (B) Alkanes, Aldehydes and Ketones

(C) Alkanes, Alkenes and Alkynes

40. The variation of Knudren diffusion (D) Heavy metals & Gases
co-efficient (DKA) with the absolute
temperature (T) follows
44. Thermoplastic serine are not usually
(A) DKA x T
(A) soft
(B) DK A x T3 2
(B) stronger
Ti 2
DKA x (C) Less brittle

(D) DKA x T2 (D) Can be reclaimed from the
wastes

C11 9 A-1

45. Fire clay is 48. Which of the following fire dust
removal equipment is the most
(A) Basic Refractory efficient

(B) Acidic Refractory (A) Bas filter

(C) Mentral Refectory (B) Scrubber

(D) Not a refractory material (C) Electrostatic Precipitator

(D) Cyclone Separator

46. Which of the following is a man made
source of air pollution ?
49. Polluted water having Low BOD are
(A) Automobile exhaust most economically treated in

(B) Forest fire Sedimentation tank
(A)

(C) Bacterial action in soil and
(B) Oxidation ponds
swamp areas

(C) Sludge digester
(D) Volcanoes

(D) Clarifier

47. Carbon monoxide is a pollutant, which
causes
50. Pick out the one which is not a
(A) respiratory disease (eg. ashthma) chemical coagulant

(B) Asphyxiation (suffocation leading (A) Aluminium sulphate
to death)
(B) Ferrous sulphate
(C) Retardation in crop growth
(C) Hydrated lime
(D) Damage to building materials
like marble (D) Chloraminc

A-1 10 CH

PART — 2

(Each question carries two marks) (25 x 2 = 50)

51. For zero order constant volume 53. Rate constants tier two reactions arc k1
reaction A ---> R taking place in a and k, at 300 K. A i and A, arc
batch reactor, the conversion is 50% of arrhenius constants. What is the ratio
A after 5 minutes. If the initial E I /E, if k1 /k, = A l /A, ?
concentration of A is 1.2 mol/lit. What
is the conversion after 5 minutes if the (A) 4
initial concentration is 1 mol/lit. ? (B) 3
(C) 2
(A) 40%
(D) 1

(B) 50%
54. Keeping all else same in the operation
(C) 60% of mixed flow adiabatic reactor, what
happens to conversion if the feed
temperature is increased for an
(D) 70%
endothermic reaction ?
(A) Conversion increases
(B) Conversion decreases
52. What is the relation between E and F (C) Conversion remain constant
curves ? (D) Conversion increases linearly

dF
(A) E= 55. A single effect evaporator is fed with
dt
4000 kg/hr of weak liquor containing
17% caustic by weight and is
dE concentrated to get thick liquor
(B) F = dt
containing 40/a by weight of caustic.
Calculate the amount of water
dE evaporated.
(C) t=
dF (A) 2100 kg/hr
(B) 2200 kg/hr
dF
(D) A= (C) 2300 kg./hr
dU
(D) 2400 kg/hr

C11 11 A-1

56. Convert 588 g/lit. H,SO4 to normality. 59. Chemical potential of its components
of a system is given by
(A)
cA
(B) 10 (A)
\c nI T, P,

(C) 11

( J
(D) 12 (B)
P, n

57. How many moles of H,SO4 will
(C)
contain 64 kg of S ?

(A)
r
(D) —
(B) P

(C) 3

(D) 4
60. 20 kg of water is vaporized at constant
temperature of 100 °C and 1 atm
pressure. The heat added to the system
is 2257 kJ/kg. The specific volume of
58. A gas mixture contains 0.28 kgmol of
HC/, 0.34 kgmol of N, and 0.09 kgmol liquid and vapor arc 1.04 x 10-3 and
167.2 x 10-2 m3/kg respectively. Find
of 0,. What is the average molecular
AU.
weight of the gas ?

(A) 21,798 kJ/kg
(A) 31.8

(B) 41.8 (B) 33,798 kJ/kg

(C) 53.8 (C) 41,798 kJ/kg

(D) 63.8
(D) 51,798 kJ/kg

A-1 12 CII

61. Fundamental principle of refrigeration
64. The radiative heat transfer rate per unit
is based on
(A) Zeroth Law area (w/m2) between two plane parallel
(B) First Law grey surfaces (emissivity = 0.9)
(C) Second Law
maintained at 400 K and 300 K is
(D) Third Law

(A) 992
62. A thin flat plate 2m x 2m is hanging
freely in air. The temperature of the
surroundings is 25 °C. Solar radiation (B) 812
is falling on one side of three plates at
the rate. of 500 W/m2. Temperature of !OA11:./1
f Tfl
the plate will remain constant at 30 °C,
if the convective heat transfer
coefficient (in w/m2 °C) is (D) 567
(A) 25
(B) 50
(C) 100
(D) 200 65. The equivalent diameter for flow

through a rectangular duct of width B
63. A counterflow shell and tube
exchanger is used to heat water with and height H is
hot exhaust gases. The water
(C = 4180 J/kg °C) flows at a rate of HB
(A)
2 kg/s while the exhaust gas 2 (H+B)
(1030 J/kg °C) flows at the rate of
5.25 kg/s. If the heat transfer surface
HB
area is 32.5 m- and the overall heat (B)
+B)
transfer coefficient is 200 W/m2 °C,
what is the NTU for the heat
exchanger '? ")HB
(C)
(A) 1.2 H+B

(B) 2.4
4HB
(C) 4.5 (D)
(H+B)
(D) 8.6

CII 13 A-1

66. Drag force is expressed mathematically 68. For particle (coefficient of friction =

as, to he caused by a. Smooth roll crusher
(angle of nip = a). which of the
(A) F D =7) SU-CDA
following relationships has to be
satisfied.
(B) FD = Su2CDA

(A) (1 ?_ 2 tan-I ).t
(C) F D = 2SU2CDA

(B) 5 tan a
(D) F D = 2SuC DA2

(C) a < 2 tan la

(D) 2 tan-I a
67. Reynolds number is significant in,

(A) Supersonics, as with projectile

end jet propulsion. 69. In constant pressure filtration,

(B) Full immersion or completely (A) The filtrate flow rate is
enclosed flow, as with pipes, maximum at the start and
aircraft wings, nozzles etc. deceases continuously to the end.

(C) Simultaneous motion through (B) The filtrate flow rate is minimum
two fluids where there is a at the start and increases
surface discontinuity, gravity continuously to the end.
forces, and wave making effect
(C) The filtrate flow rate is constant.
with seip hull's.

(D) Increases slowly to a constant
(D) Evaporation of liquid.
value.

A-1 14 CH

70. A binary hydrocarbon liquid mixture 73. The proportional band of a pneumatic
of A and B (kA = 1.5) containing 60 controller with a scale range of
mole % A is flash vaporized. If 40% 0 — 120 °C when the output changes
of the feed is vaporized, the mole from 20 — 100 kNin2 as the temperature
fraction of A in the liquid product is rises from 95 — 110 °C is

(A) 0.6 (A) 5.33
(B) 10.6
(B) 0.4
(C) 83.33
(C) 0.3
(D) 12.5
(D) 0.5

74. For a unit step input, a system with
forward path transfer function
71. For a certain mass transfer process, 20
= 1 x 10-3 cm/s and DAB = 1 x 10-5 G(s) = —i
s and feedback path transfer
cm'/s. The film thickness in 'cm' is function H(S) = (S + 5), has a steady
then state output of

(A) 0.1 (A) 0
(B) 0.5
(B) 0.01
(C) 0.2
(C) 0.001
(D) 0.6
(D) 0.0001

75. The number of roots of the equation
72. The drying rate in the constant rate 2S4 + S3 + 3S2 + 5S + 7 =
period in kg/m2 is
that lie in the right half of S plane is
(A) 1.00 (A) two
(B) 1.03 (B) zero

(C) 1.06 (C) one

(D) 1.09 (D) three

CH 15 A-1

A-1 16 CH