PU CET PG 2017 Question Paper M.E._Chemical_

M.E.(Chemical)
1. Which controller has the maximum stabilising time?
A) P B) PD
C) PI D) PID
2. In a laminar boundary layer, the nominal thickness varies with the longitudinal
distance x as
A) x-½ B) x-⅓
C) x D) x½
3. Salt cake is chemically represented by
A) Na2SO4 B) CaSO4.½H2O
C) MgSO4 D) BaSO4
4. Alkyl benzene sulphonate is
A) Detergent B) Rubber
C) Polyster D) Pesticide
5. Transition length for a turbulent fluid entering into a pipe is around.............times the
pipe diameter
A) 5 B) 50
C) 500 D) 1000
6. HETP is numerically equal to HTU only when operating line
A) Lies below the equilibrium line B) Lies above the equilibrium line
C) Is parallel to the equilibrium line D) Is far from the equilibrium line
7. Zeolite removes both temporary as well as permanent hardness of water by
precipitating calcium and magnesium present in water as insoluble zeolites. Used
zeolite is regenerated by flushing with the solution of
A) Calcium sulphate B) Sodium chloride
C) Sodium sulphate D) Magnesium chloride
8. Back mixing is more predominant in
A) A well stirred batch reactor A) A well stirred batch reactor
C) A single CSTR D) A single CSTR
9. Presence of aromatics in
A) Diesel increases its cetane number B) Kerosene increases its smoke point
C) Kerosene increases its flash point D) Petrol increases its octane number
10. Aniline point is the temperature at which
A) equal weight of diesel & the aniline are B) equal weight of aniline & the test
completely miscible sample are completely miscible
C) equal volume of aniline & the test D) aniline vaporises
sample are completely miscible

11. Internal energy change of a system over one complete cycle in a cyclic process is
A) Zero B) +ve

C) -ve D) Dependent on the path
12. Slope of the feed line, if feed to a distillation column is a saturated liquid, is
A) 0 B) ∞
C) ˃ 1 D) ˂ 1

13. Cetane number of high speed diesel must be ≥
A) 30 B) 45
C) 75 D) 95
14. In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for
a fluid flowing through the annulus) would be
A) Same as that for fluid flow B) Less than that for fluid flow
C) More than that for fluid flow D) D2 – D1 (D1 and D2 are inner diameter
of inner and outer pipes respectively)

15. Penetration test determines the __________ of the grease.
A) Stiffness B) Lubricating properties
C) Service temperature D) Variation in viscosity with temperature

16. The Grashoff number is defined as the ratio of the
A) Buoyancy to inertial forces B) Inertial to viscous forces
C) Buoyancy to viscous forces D) Buoyancy to surface tension forces

17. A proportional controller with a gain of Kc is used to control a first order process. The
offset will increase, if
A) Kc is reduced B) Kc is increased
C) Integral control action is introduced D) Derivative control action is introduced
18. Chemisorption (chemical adsorption) is
A) Same as "Van der Waals" adsorption B) Characterised by adsorption of heat
C) An irreversible phenomenon D) A reversible phenomenon

19. Response of a system to a sinusoidal input is called __________ response
A) Impluse B) Unit step
C) Frequency D) Pulse

20. The vessel dispersion number (D/uL) for plug flow is
A) 0 B) 500
C) 750 D) ∞

21. A reaction in which one of the products of reaction acts as a catalyst is called
A) Homogeneous catalytic reaction B) Heterogeneous catalytic reaction
C) Autocatalytic reaction D) Biochemical reaction

22. The ratio of shear stress to shear strain is called
A) Bulk modulus B) Shear modulus

C) Modulus of rigidity D) Modulus of elasticity

23. German silver used for decorative purposes contains maximum percentage of
A) Copper B) Silver
C) Zinc D) Nickel

24. In second order underdamped system,
A) Decay ratio = (overshoot) B) Decay ratio = (overshoot)2
C) Overshoot increases for increasing D) Large damping co-efficient means
damping co-efficient smaller damping

25. Which of the following is an undesirable dynamic characteristic of an instrument ?
A) Reproducibility B) Dead zone
C) Time lag D) Static error

26. The deflection of the free end of the bimetallic strips in a bimetallic thermometer with
temperature is nearly
A) Linear B) Non-linear
C) Parabolic D) Hyperbolic

27. If response of a control system is to be free of offset and oscillation, the most suitable
controller is
A) Proportional controller B) Proportional-derivative (PD) controller
C) Proportional-integral (PI) controller D) Proportional integral-derivative (PID)
controller

28. Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured
at STP) would be
A) 580 B) 640
C) 1160 D) 1180

29. Compressibility factor for almost all the gases are approximately same at the same
A) Pressure and temperature B) Reduced pressure and reduced
temperature
C)Critical pressure and critical temperature D) Pressure

30. Pick out the first order system from among the following
A) Damped vibrator B) Non-interacting system of two tanks
in series

C) Mercury in glass thermometer kept in D) Interacting system of two tanks in
boiling water series

31. Free flowing granular materials can be best dried in a __________ drier
A) Cylinder B) Drum

C) Rotary D) Freeze
32. Coefficient of Performance (COP) of a refrigerator is the ratio of
A) Work required to refrigeration obtained B) Refrigeration obtained to work required
C) Lower to higher temperature D) Higher to lower temperature

33. In a shell and tube heat exchanger, the floating tube bundle head arrangement is used
A) In low range of temperature differences B) Because of its low cost
C) In high range of temperature differences D) To prevent corrosion of the tube bundles

34. Fick’s first law of diffusion for the z direction is
A) JA = DAB B) JA = - DAB
C) JA = DAB D) JA = - DAB

35. During solid state sintering of powders, the following mechanism can be active
A) Evaporation and condensation B) Solid state diffusion processes
C) Liquid formation in grain boundaries D) Creation of more dislocations

36. Dimension of absolute viscosity is
A) MLT-1 B) ML-1T
C) ML-1T-1 D) MLT

37. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of
the velocity head and the pressure head at the
A) Suction B) Suction minus vapor pressure of the
liquid at suction temperature
C) Discharge D) Discharge minus vapor pressure of
the liquid at the discharge
temperature

38. A first order reaction requires two equal sized CSTR. The conversion is
A) More when they are connected in series B) More when they are connected in
parallel
C) Less when they are connected in series D) Same whether they are connected in
series or in parallel

39. Which of the following is the most suitable for very high pressure gas phase reaction?
A) Stirred tank reactor B) Fluidised bed reactor
C) Batch reactor D) Tubular flow reactor

40. The internal energy of an ideal gas is a function of its __________ only
A) Molecular size B) Volume
C) Temperature D) Pressure

41. Utilities cost in the operation of chemical process plant comes under the
A) Plant overhead cost B) Fixed charges
C) Direct production cost D) General expenses
42. Which of the following is not a component of working capital?
A) Raw materials is stock B) Finished products in stock
C) Transportation facilities D) Semi-finished products in the process

43. Scale formation in boiler is controlled by
A) Preheating of feed water B) Eliminating H2S in feed water
C) Reduction in hardness, silica & alumina D) Keeping the pH value of feed water
in feed water just below 7

44. Weeping in a distillation column
A) Increases tray efficiency B) Results due to very high gas velocity
C) Provides large interfacial surface for D) Results due to very low gas velocity
mass transfer

45. Buoyant force is
A) Resultant of upthrust and gravity forces B) Resultant force on the body due to the
acting on the body fluid surrounding it
C) Resultant of static weight of body and D) Equal to the volume of liquid
dynamic thrust of fluid displaced by the body

46. The most common packing used in industrial operations is __________ rings
A) Lessing B) Cross-partition
C) Raschig D) Single spiral

47. Which of the following forces does not act in case of fluids?
A) Centrifugal force B) Tensile force
C) Vibratory force D) Elastic force

48. For measuring flow by a venturimeter, it should be installed in
A) Vertical line B) Horizontal line
C) Inclined line with upward flow D) In any direction and in any location

49. Maintenance cost of a __________ pump for a particular duty is the least
A) Centrifugal B) Volute
C) Gear D) Reciprocating

50. Maximum heat transfer rate is obtained in
A) Laminar flow B) Turbulent flow
C) Creeping flow D) Transition region

51. Steam distillation is used to

A) Reduce the number of plates B) Avoid thermal decomposition of a
component
C) Increase the total pressure of distillation D) Increase the efficiency of separation

52. Stanton number for mass transfer is defined as
A) (Re x Sherwood number)/Schmidt B) Re/(Schmidt Number x Sherwood
Number number)
C) Sherwood number/ (Re x Schmidt D) Schmidt Number/(Sherwood number x
Number) Re )

53. To handle smaller quantity of fluid at higher discharge pressure, use a ______ pump
A) Volute B) Reciprocating
C) Centrifugal D) Rotary vacuum

54. Which of the following is a pressure filter?
A) Rotary drum filter B) Sand filter
C) Leaf filter (Moore filter) D) Plate and frame

55. 200 mesh screen means 200 openings per
A) cm B) cm2
C) inch2 D) inch

56. Sulphuric acid mist is arrested by using a __________ scrubber
A) Packed wet B) Hollow wet
C) Co-current D) Venturi

57. Relative humidity is the ratio of the
A) Partial pressure of the vapour to the B) Saturation humidity to actual humidity
vapour pressure of the liquid at room
temperature
C) Partial pressure of the vapour to the D) Actual humidity to saturation humidity
vapour pressure of the liquid at gas
temperature

58. A good control system has all the following features except
A) Good stability B) Slow response
C) Food accuracy D) Sufficient power handling capacity

59. Schedule number of a pipe, which is a measure of its wall thickness, is given by
A) 100 P'/S B) 1000 S/P'
C) 1000 P'/S D) 100 S/P'

60. The excess energy of reactants in a chemical reaction required to dissociate into
products is termed as the __________ energy

A) Potential B) Activation
C) Binding D) Threshold

61. __________ columns are used for liquid dispersion in a continuous gas phase
A) Packed B) Pulse
C) Bubble cap D) Sieve tray
62. Degress of freedom at triple point will be
A) 1 B) 2
C) 0 D) 3
63. A reactor having a salvage value of Rs. 10000 is estimated to have a service life of 10
years. The annual interest rate is 10%. The original cost of the reactor was Rs. 80000.
The book value of the reactor after 5 years using sinking fund depreciation method will
be Rs.
A) 40096 B) 43196
C) 53196 D) 60196

64. Which of the following is the cheapest material of construction for the storage of
sodium hydroxide upto a concentration of 75%?
A) Stainless steel B) Plain carbon steel
C) Nickel D) Copper

65. Acetic acid will be most economically separated from a dilute solution of acetic acid in
water by
A) Continuous distillation B) Evaporation
C) Solvent extraction D) Absorption

66. Operating principle of cyclone separator is based on the action of _______dust particles
A) Gravitational force on B) Centrifugal force on
C) Electrostatic force on D) Diffusion of

67. For an isothermal reversible compression of an ideal gas
A) Only ∆H =0 B) Only ∆E = 0
C) dQ = dE D) ∆E = ∆H = 0

68. Most commonly used joint in the underground pipe lines is the
A) Sleeve joint B) Coupling
C) Expansion joint D) Flange

69. Flow occurring in a pipeline when a valve is being opened is
A) Steady B) Unsteady
C) Laminar D) Vortex

70. Eddy momentum diffusivity, thermal diffusivity and mass diffusivity will be same for
A) NPr = NSc = 0.7 B) NPr = NSc = 1
C) NPr = NSc = 7.02 D) NPr = NSc = 297

71. Dittus-Boelter equation cannot be used for molten metals mainly due to its very low
A) Prandtl number B) Grashoff number
C) Thermal conductivity D) Viscosity

72. Drying operation under vacuum is carried out to
A) Dry those materials which have very B) Reduce drying temperature
high unbound mositure content
C) Increase drying temperature D) Dry materials having high bound
moisture content
73. Which of the following liquid-vapor contacting devices provides maximum contact
surface area for a particular duty?
A) Sieve plate column B) Bubble cap column
C) Randomly packed column D) Wetted wall column

74. Overall efficiency of the distillation column is
A) Always more than the point efficiency B) The ratio of number of actual plates to
ideal plates
C) Same as Murphree efficiency D) The ratio of number of ideal plates to
actual plates

75. Time constant of a first order system is defined as the time taken for the system output
to reach 63.2% of its ultimate value after
A) A step change in input B) A ramp change in input
C) An impulse change in input D) A sinusoidal change in input

x-x-x