CHEMICAL ENGINEERING- PAGE 2
CHEMICAL ENGINEERING MCQ- PAGE 2
1:-Hardness in water is caused by the presence of:
A:-sodium chloride
B:-sodium carbonate
C:-calcium chloride
D:-potassium nitrate
Ans: C
2:-pH of acidic solution is:
A:-14
B:-7
C:-less than 7
D:-more than 7
Ans: C
3:-Which of the following methods empolyes ion-selective membranes?
A:-sofening
B:-electrodialysis
C:-super-filtration
D:-flash evaporator
Ans: B
4:-Coagulants help in settling of:
A:-suspended impurities only
B:-fine suspended impurities
C:-colloidal particles only
D:-both the suspended and colloidal particles.
Ans: D
5:-Ultraviolet rays are used in water treatment for :
A:-illumination
B:-sterilization
C:-coagulation
D:-sedimentation
Ans: B
6:-Which of following fuel gases possess the highest calorific value?
A:-water gas
B:-coal gas
C:-producer gas
D:-natural gas
Ans: B
7:-The process of splitting of bigger hydrocarbons into smaller hydrocarbon molecules, is called:
A:-pyrolysis
B:-thermal decomposition
C:-cracking
D:-combustion
Ans: C
8:-Analysis of flue gases is done by:
A:-Boy′s gas calorimeter
B:-Orsat apparatus
C:-retort
D:-Bomb calorimeter
Ans: B
9:-Lignite is:
A:-lowest rank coal
B:-highest rank coal
C:-used in metallurgy of iron
D:-none of the above
Ans: A
10:-During fermentation of molasses, the enzyme which converts glucose and fructose into alcohol is:
A:-zymase
B:-lypase
C:-invertase
D:-maltase
Ans: A
11:-For good performance, the hydrocarbon molecules in a diesel fuel should be:
A:-branch-chained
B:-side-chained
C:-straight-chained
D:-aromatic
Ans: C
12:-EDTA method of determining hardness of water can be used to determine:
A:-all types of hardness
B:-temporary hardness
C:-permanent hardness only
D:-alkaline hardness only
Ans: A
13:-During reverse osmosis:
A:-Dissolved salts are pushed out through the semipermeable membrane
B:-only dissolved ionic salts are pushed out through the semipermeable membrane
C:-pure water is pushed out through semipermeable membrane.
D:-both water and dissolved salts are pushed out through the semipermeable membrane
Ans: C
14:-Swimming for a long time in salt water makes the skin of one′s fingertips wrinkled. Which one of the following properties is responsible for this observation?
A:-Osmosis
B:-Dialysis
C:-Electrodialysis
D:-Coagulation
Ans: A
15:-Reflectivity of a black body is ----------
A:-0
B:-0.5
C:-0.8
D:-1.0
Ans: A
16:-For supporting horizontal cylindrical vessels ----------supports are commonly used
A:-saddle
B:-skirt
C:-lug
D:-bracket
Ans: A
17:-Scale formation in boilers causes :
A:-no loss of heat
B:-wastage of heat
C:-increase in efficiency
D:-none of the above
Ans: B
18:-Multiple effect evaporation is carried out ,to -----------
A:-decreases heat losses
B:-increase capacity
C:-decrease capital cost
D:-decrease working cost
Ans: D
19:-The calorific value of a fuel is expressed as :
A:-kcal cm
B:-kcal cm-³
C:-kcal m-³
D:-cal m-³
Ans: C
20:-The process of vulcanisation makes rubber :
A:-soluble in water
B:-hard
C:-soft
D:-more elastic
Ans: B
21:-Bakelite is manufactured by heating together :
A:-phenol and formaldehyde
B:-vinyl chloride and benzene
C:-phenol and acetone
D:-phenol and oxalic acid
Ans: A
22:-A plastic which can be softened on heating hardened on cooling is called :
A:-thermoelastic
B:-thermoplastic
C:-thermosetting
D:-thermite
Ans: B
23:-Desalination is a process of removing :
A:-oil
B:-mineral acids
C:-common salt
D:-hardness from water
Ans: C
24:-Most popular and ideal disinfectant in water works is :
A:-bleaching powder
B:-ozone
C:-chlorine
D:-lime
Ans: C
25:-Standard atmospheric pressure in terms of water column is :
A:-9.81m
B:-10.33m
C:-8.75m
D:-12.35m
Ans: B
26:-Electrolytic conduction is due to :
A:-movement of the electrolyte through the external wire
B:-flow of electrons through the solution
C:-migration of ions to the oppositely charged electrodes
D:-flow of positive ions through the external wire
Ans: C
27:-A galvenic cell converts :
A:-electrical energy into chemical energy
B:-chemical energy into electrical energy
C:-electrical energy into heat energy
D:-chemical energy into heat energy
Ans: B
28:-Select a suitable adsorbent for the removal of phenolic contaminants from waste water
A:-active carbon
B:-silica gel
C:-molecular sieve
D:-alumina
Ans: A
29:-The process of zinc coating over iron sheets by hot-dipping is called :
A:-galvanisation
B:-tinning
C:-sheradizing
D:-anodizing
Ans: A
30:-Drying oils supply to paint film :
A:-main film-forming constituent
B:-medium or vehicle
C:-water-proofness
D:-all of these.
Ans: D
31:-Butter is a colloidal sol containing :
A:-water dispersed in fat
B:-fat globules dispersed in water
C:-fat dispersed in casein
D:-suspension of casein in water
Ans: A
32:-Tyndall effect is due to :
A:-absorption of light
B:-transmittance of light
C:-reflection of light
D:-scattering of light
Ans: D
33:-The atomic number of an element is 9. During compound formation, it normally :
A:-gains 2 electrons
B:-loses 1 electron
C:-gains 1 electron
D:-losses 2 electrons
Ans: C
34:-Nature of bonding in diamond is :
A:-ionic
B:-covalent
C:-coordinate
D:-metallic
Ans: B
35:-Silicon is used in transistors as :
A:-conductor
B:-insulator
C:-semiconductor
D:-capacitor
Ans: C
36:-Most poisonous pollutant in water is :
A:-arsenic
B:-phosphate
C:-zinc
D:-carbon dioxide
Ans: A
37:-Bhopal gas tragedy in 1984 was caused by :
A:-carbonyl chloride
B:-carbon monoxide
C:-methyl cyanide
D:-methyl isocyanate
Ans: D
38:-Which one of the following refractories is used in nuclear engineering as moderator?
A:-chromite bricks
B:-carborundum
C:-Beryllia bricks
D:-fire clay bricks
Ans: C
39:-A bullet-resistant glass is obtained by:
A:-embedding a wiremesh at the centre of the glass sheet
B:-pressing together several layers of glass with vinyl resins in alternate layers
C:-using two or more plates of glass separated by 6-13mm thick gap containing dehydrated air
D:-none of the above
Ans: B
40:-The single most important property of lubricating oil is its:
A:-fire-point
B:-cloud-point
C:-oiliness
D:-viscosity-index
Ans: D
A:-sodium chloride
B:-sodium carbonate
C:-calcium chloride
D:-potassium nitrate
Ans: C
2:-pH of acidic solution is:
A:-14
B:-7
C:-less than 7
D:-more than 7
Ans: C
3:-Which of the following methods empolyes ion-selective membranes?
A:-sofening
B:-electrodialysis
C:-super-filtration
D:-flash evaporator
Ans: B
4:-Coagulants help in settling of:
A:-suspended impurities only
B:-fine suspended impurities
C:-colloidal particles only
D:-both the suspended and colloidal particles.
Ans: D
5:-Ultraviolet rays are used in water treatment for :
A:-illumination
B:-sterilization
C:-coagulation
D:-sedimentation
Ans: B
6:-Which of following fuel gases possess the highest calorific value?
A:-water gas
B:-coal gas
C:-producer gas
D:-natural gas
Ans: B
7:-The process of splitting of bigger hydrocarbons into smaller hydrocarbon molecules, is called:
A:-pyrolysis
B:-thermal decomposition
C:-cracking
D:-combustion
Ans: C
8:-Analysis of flue gases is done by:
A:-Boy′s gas calorimeter
B:-Orsat apparatus
C:-retort
D:-Bomb calorimeter
Ans: B
9:-Lignite is:
A:-lowest rank coal
B:-highest rank coal
C:-used in metallurgy of iron
D:-none of the above
Ans: A
10:-During fermentation of molasses, the enzyme which converts glucose and fructose into alcohol is:
A:-zymase
B:-lypase
C:-invertase
D:-maltase
Ans: A
11:-For good performance, the hydrocarbon molecules in a diesel fuel should be:
A:-branch-chained
B:-side-chained
C:-straight-chained
D:-aromatic
Ans: C
12:-EDTA method of determining hardness of water can be used to determine:
A:-all types of hardness
B:-temporary hardness
C:-permanent hardness only
D:-alkaline hardness only
Ans: A
13:-During reverse osmosis:
A:-Dissolved salts are pushed out through the semipermeable membrane
B:-only dissolved ionic salts are pushed out through the semipermeable membrane
C:-pure water is pushed out through semipermeable membrane.
D:-both water and dissolved salts are pushed out through the semipermeable membrane
Ans: C
14:-Swimming for a long time in salt water makes the skin of one′s fingertips wrinkled. Which one of the following properties is responsible for this observation?
A:-Osmosis
B:-Dialysis
C:-Electrodialysis
D:-Coagulation
Ans: A
15:-Reflectivity of a black body is ----------
A:-0
B:-0.5
C:-0.8
D:-1.0
Ans: A
16:-For supporting horizontal cylindrical vessels ----------supports are commonly used
A:-saddle
B:-skirt
C:-lug
D:-bracket
Ans: A
17:-Scale formation in boilers causes :
A:-no loss of heat
B:-wastage of heat
C:-increase in efficiency
D:-none of the above
Ans: B
18:-Multiple effect evaporation is carried out ,to -----------
A:-decreases heat losses
B:-increase capacity
C:-decrease capital cost
D:-decrease working cost
Ans: D
19:-The calorific value of a fuel is expressed as :
A:-kcal cm
B:-kcal cm-³
C:-kcal m-³
D:-cal m-³
Ans: C
20:-The process of vulcanisation makes rubber :
A:-soluble in water
B:-hard
C:-soft
D:-more elastic
Ans: B
21:-Bakelite is manufactured by heating together :
A:-phenol and formaldehyde
B:-vinyl chloride and benzene
C:-phenol and acetone
D:-phenol and oxalic acid
Ans: A
22:-A plastic which can be softened on heating hardened on cooling is called :
A:-thermoelastic
B:-thermoplastic
C:-thermosetting
D:-thermite
Ans: B
23:-Desalination is a process of removing :
A:-oil
B:-mineral acids
C:-common salt
D:-hardness from water
Ans: C
24:-Most popular and ideal disinfectant in water works is :
A:-bleaching powder
B:-ozone
C:-chlorine
D:-lime
Ans: C
25:-Standard atmospheric pressure in terms of water column is :
A:-9.81m
B:-10.33m
C:-8.75m
D:-12.35m
Ans: B
26:-Electrolytic conduction is due to :
A:-movement of the electrolyte through the external wire
B:-flow of electrons through the solution
C:-migration of ions to the oppositely charged electrodes
D:-flow of positive ions through the external wire
Ans: C
27:-A galvenic cell converts :
A:-electrical energy into chemical energy
B:-chemical energy into electrical energy
C:-electrical energy into heat energy
D:-chemical energy into heat energy
Ans: B
28:-Select a suitable adsorbent for the removal of phenolic contaminants from waste water
A:-active carbon
B:-silica gel
C:-molecular sieve
D:-alumina
Ans: A
29:-The process of zinc coating over iron sheets by hot-dipping is called :
A:-galvanisation
B:-tinning
C:-sheradizing
D:-anodizing
Ans: A
30:-Drying oils supply to paint film :
A:-main film-forming constituent
B:-medium or vehicle
C:-water-proofness
D:-all of these.
Ans: D
31:-Butter is a colloidal sol containing :
A:-water dispersed in fat
B:-fat globules dispersed in water
C:-fat dispersed in casein
D:-suspension of casein in water
Ans: A
32:-Tyndall effect is due to :
A:-absorption of light
B:-transmittance of light
C:-reflection of light
D:-scattering of light
Ans: D
33:-The atomic number of an element is 9. During compound formation, it normally :
A:-gains 2 electrons
B:-loses 1 electron
C:-gains 1 electron
D:-losses 2 electrons
Ans: C
34:-Nature of bonding in diamond is :
A:-ionic
B:-covalent
C:-coordinate
D:-metallic
Ans: B
35:-Silicon is used in transistors as :
A:-conductor
B:-insulator
C:-semiconductor
D:-capacitor
Ans: C
36:-Most poisonous pollutant in water is :
A:-arsenic
B:-phosphate
C:-zinc
D:-carbon dioxide
Ans: A
37:-Bhopal gas tragedy in 1984 was caused by :
A:-carbonyl chloride
B:-carbon monoxide
C:-methyl cyanide
D:-methyl isocyanate
Ans: D
38:-Which one of the following refractories is used in nuclear engineering as moderator?
A:-chromite bricks
B:-carborundum
C:-Beryllia bricks
D:-fire clay bricks
Ans: C
39:-A bullet-resistant glass is obtained by:
A:-embedding a wiremesh at the centre of the glass sheet
B:-pressing together several layers of glass with vinyl resins in alternate layers
C:-using two or more plates of glass separated by 6-13mm thick gap containing dehydrated air
D:-none of the above
Ans: B
40:-The single most important property of lubricating oil is its:
A:-fire-point
B:-cloud-point
C:-oiliness
D:-viscosity-index
Ans: D
41:-Purest form of Iron is:
A:-steel
B:-wrought iron
C:-pig iron
D:-cast iron
Ans: B
42:-Caprolactum is a monomer of:
A:-nylon-6
B:-Teflon
C:-PTFE
D:-Melamine
Ans: A
43:-The emissivity of a real surface is always :
A:-greater than unity
B:-equal to unity
C:-less than unity
D:-less than or greater than unity
Ans: C
44:-Asphalt is obtained from-------in a refinery
A:-residues
B:-intermediate distillates
C:-heavy distillates
D:-light distillates
Ans: A
45:-An example of high explosive is :
A:-gun powder
B:-nitrocellulose
C:-TNT
D:-lead oxide
Ans: C
46:-Identification of an organic compound can be established by using:
A:-UV spectroscopy
B:-IR spectroscopy
C:-chromatography
D:-none of the above
Ans: B
47:-Which noise can be tolerated by human ear?
A:-20 decibels
B:-100 decibels
C:-80 decibels
D:-120 decibels
Ans: C
48:-A fluid has no viscosity:
A:-real fluid
B:-ideal fluid
C:-Newtonian fluid
D:-Non-Newtonian fluid
Ans: B
49:-The principle of continuity is based on
A:-law of conservation of energy
B:-law of conservation of mass
C:-law of conservation of momentum
D:-all of the above
Ans: B
50:-The absolute pressure is equal to:
A:-gauge pressure - atmospheric pressure
B:-gauge pressure + vacuum pressure
C:-gauge pressure +atmospheric pressre
D:-Atmospheric pressure -gauge pressure
Ans: C
51:-Which of the following is present in lemon?
A:-carbonic acid
B:-tartaric acid
C:-Oxalic acid
D:-citric acid
Ans: D
52:-Which of the following pair have pH less than 7 ?
A:-tea and coffee
B:-gastric juice and NaOH
C:-lemon juice and lime water
D:-sodium carbonate and sodium bicarbonate
Ans: A
A:-steel
B:-wrought iron
C:-pig iron
D:-cast iron
Ans: B
42:-Caprolactum is a monomer of:
A:-nylon-6
B:-Teflon
C:-PTFE
D:-Melamine
Ans: A
43:-The emissivity of a real surface is always :
A:-greater than unity
B:-equal to unity
C:-less than unity
D:-less than or greater than unity
Ans: C
44:-Asphalt is obtained from-------in a refinery
A:-residues
B:-intermediate distillates
C:-heavy distillates
D:-light distillates
Ans: A
45:-An example of high explosive is :
A:-gun powder
B:-nitrocellulose
C:-TNT
D:-lead oxide
Ans: C
46:-Identification of an organic compound can be established by using:
A:-UV spectroscopy
B:-IR spectroscopy
C:-chromatography
D:-none of the above
Ans: B
47:-Which noise can be tolerated by human ear?
A:-20 decibels
B:-100 decibels
C:-80 decibels
D:-120 decibels
Ans: C
48:-A fluid has no viscosity:
A:-real fluid
B:-ideal fluid
C:-Newtonian fluid
D:-Non-Newtonian fluid
Ans: B
49:-The principle of continuity is based on
A:-law of conservation of energy
B:-law of conservation of mass
C:-law of conservation of momentum
D:-all of the above
Ans: B
50:-The absolute pressure is equal to:
A:-gauge pressure - atmospheric pressure
B:-gauge pressure + vacuum pressure
C:-gauge pressure +atmospheric pressre
D:-Atmospheric pressure -gauge pressure
Ans: C
51:-Which of the following is present in lemon?
A:-carbonic acid
B:-tartaric acid
C:-Oxalic acid
D:-citric acid
Ans: D
52:-Which of the following pair have pH less than 7 ?
A:-tea and coffee
B:-gastric juice and NaOH
C:-lemon juice and lime water
D:-sodium carbonate and sodium bicarbonate
Ans: A
53. The fall or rise of a liquid in a capillary tube is caused by ...
(A) Viscosity of liquid (B) Thermal conductivity of liquid (C) Density of liquid (D) Surface tension of liquid
Ans: D
54. For laminar flow of a shear-thinning liquid in pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor at
(A) < 2
(B) > 2
(C) 2
(D)1 /2
Ans: A
55. Which one of the following is a co-polymer ?
(A) Bakelite (B) Teflon (C) Polythene (D) PVC
Ans: A
56. Weber number can be used to estimate ....
(A) Ratio of inertial and centrifugal forces (B) Ratio at pressure and surface tension forces
(C) Ratio of inertial and surface tension forces (D) Ratio of inertial and compressibility forces
Ans: C
57. A globe value is most suitable for application in which ....
(A) One way flow is required (B) Flow control is required
(C) The valve is required to be either fully open or fully closed (D) The fluid contains dispersed particles
Ans: B
58. To increase the capacity of a commercial packed bed adsorber, the volumetric flow rate at gas entering is increased by 20%. The ratio of pressure drops (new to old) will be ...
(A) 1.73 (B) 1.09 (C) 1.44 (D) 1.2
Ans: C
59. The equilibrium position of the float in a rotameter is determined by the balance of three forces. These are ....
(A) Buoyancy, gravity and centrifugal forces (B) Pressure, gravity and centrifugal forces
(C) Buoyancy, drag and gravity forces (D) Buoyancy, drag and centrifugal forces
Ans: C
60. A fluid is defined as ....
(A) Is a substance that does not permanently resist distortion
(B) Is called incompressible if its viscosity is little affected by moderate changes in temperature and pressure
(C) Is called ideal if its density is zero
(D) In equilibrium is not free from shear stresses
Ans: A
61. Rotary pump is an example of which are of the following ?
(A) Piston pump (B) Diaphragm pump (C) Plunger pump (D) Gear pump
Ans: D
62. Manometers are used to measure ....
(A) Pressure Difference (B) Atmospheric Pressure (C) Viscosity (D) Flow rate
Ans: A
63. Above 50° C, flash point is determined by ....
(A) Lovibond tintometer (B) Saybolt chromometer (C) Abel apparatus (D) Pensky-Martens apparatus
Ans: D
64. The work required for crushing of solid is proportional to the new surface created is known as....
(A) Bond’s law (B) Janssen’s law (C) Kick’s law (D) Rittinger’s law
Ans: D
65. Arrange the following size reduction equipments in the decreasing order of the average particle size produced by each of them.
(A) Fluid energy mills, Ball mills, Jaw crushers
(B) Ball mills, Jaw crushers, Fluid energy mills
(C) Jaw crushers, Ball mills, Fluid energy mills
(D) Fluid energy mills, Jaw crushers, Ball mills
Ans: C
66. In a disintegrator the size reduction is effected by ...
(A) cutting action (B) compression only (C) attrition only (D) compression, impact and shear
Ans: D
67. The surface area of a unit mass of particles ...
(A) Increases as the particle size is reduced (B) Decreases as the particle size is reduced
(C) Decreases as the square root of the equivalent diameter of particle (D) Remains constant as the particle size to reduced
Ans: A
68. The co-efficient of friction between two layers of solid particles is equal to ...
(A) The ratio of applied pressure and the normal pressure (B) The ratio of normal pressure and applied pressure
(C) The tangent of the angle of internal friction of the particles (D) The tangent of the angle of repose of the particles
Ans: C
69. In a ball mill forces acting on the ball are ...
(A) Gravitational and centrifugal forces (B) Gravitational and drag forces
(C) Gravitational, drag and centrifugal forces (D) Drag and centrifugal forces
Ans: A
70. Plate and frame filter press is classified as ...
(A) Discontinuous vacuum filter (B) Continuous vacuum filter (C) Discontinuous pressure filter (D) Continuous pressure filter
Ans: C
71. The Grashof number is defined as the ratio of
(A) Buoyancy to viscous forces (B) Buoyancy to surface tension forces (C) Buoyancy to inertial forces (D) Inertial to viscous forces
Ans: C
72. Fresh orange juice contains 12% (by weight) solid and the rest water. 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is ....
(A) 0.6 (B) 0.7 (C) 0.5 (D) 0.4
Ans: B
73. For condensation of pure vapours, if the heat transfer co-efficients in filmwise and dropwise condensation are respectively hf and hd, then
(A) hf > hd
(B) hf could be greater or smaller than hd
(C) hf = hd
(D) hf < hd
Ans: D
74. The non-dimentional temperature gradient in a liquid at the wall of a pipe is referred as ....
(A) The prandtl number (B) The schmidt number
(C) The nusselt number (D) The heat flux
Ans: C
75. According to Duhring’s rule, the boiling point of a given solution is ....
(A) An exponential function of the boiling point of pure water at the same pressure.
(B) A linear function of the concentration of the solute.
(C) A linear function of the pressure.
(D) A linear function of the boiling point of pure water at the same pressure.
Ans: A
76. Near the entrance of a piped where fluid is being heated, the temperature profile is not fully developed and the local heat-transfer co-efficient is ....
(A) Zero
(B) Infinite
(C) Greater than the heat transfer co-efficient for fully developed turbulent flow
(D) Smaller than the heat transfer co-efficient for fully developed turbulent flow
Ans: C
77. Natural silk is a polymer of ..........
(A) Nucleotide (B) Adipic acid (C) Nucleoside (D) Amino acid
Ans: D
78. Which one among the following is not a reinforcing fibre for plastic ?
(A) Polymeric fibres (B) Carbon fibres (C) Glass fibres (D) Nichrome fibres
Ans: D
79. A black body does not ....
(A) Follow Stefan-Boltzmann’s law (B) Reflect radiation (C) Emit radiation (D) Absorb radiation
Ans: B
80. Which one of the following tube configurations in a heat exchanger results in the maximum heat transfer rate ?
(A) Rectangular pitch (B) Rhombus pitch (C) Square pitch (D) Triangular pitch
Ans: D
81. Assume that benzene is immisible in water. The normal boiling point of benzene and water are 80.1° C and 100° C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water will be ....
(A) less than 80.1° C
(B) Greater than 80.1° C but less than 100° C
(C) 80.1° C
(D) 100° C
Ans: A
82. The recovery of penicillin from the acidified fermentation broth is done by ...
(A) Liquid extraction (B) Absorption (C) Evaporation (D) Distillation
Ans: A
83. Molecular diffusivity of a liquid ....
(A) Decreases with temperature (B) Is independent of temperature
(C) Increases with temperature (D) May increase or decrease with temperature
Ans: C
84. The number of ideal plates required for specified separation in a plate column can be calculated by the use of ....
(A) Underwood equation (B) Murphree equation (C) Kremser-Brown-Souders equation (D) Rayleigh equation
Ans: C
85. In absorber the equilibrium curve is always ....
(A) Above the operating line (B) A straight line (C) Below the operating line (D) Parallel to the operating line
Ans: A
86. A component of gas mixture absorbed in a solvent is usually desorbed to reuse the solvent. Two methods used to desorb the absorbed components are (a) and (b)
(A) (a) pressure increase (b) temperature reduction
(B) (a) pressure reduction (b) temperature increase
(C) (a) pressure reduction (b) temperature reduction
(D) (a) pressure increase (b) temperature increase
Ans: B
87. Adiabatic saturation process of atmospheric air is a process of constant ....
(A) Dew-point temperature (B) Dry-bulb temperature (C) Relative humidity (D) Wet-bulb temperature
Ans: D
88. If the McCabe-Thiele assumptions are valid, the molal flow rates of liquid stream in the enriching and stripping sections are equal for .... (A) Saturated liquid feed (B) Superheated vapour feed (C) Subcooled liquid feed (D) Saturated vapour feed
Ans: D
89. Which one among the following is the raw material for the manufacture of caprolactam, obtained from .......... ?
(A) Pyridine (B) Naphthalene (C) Benzene (D) Phenol
Ans: C
90. Which one of the following ecosystem has the highest gross primary productivity ?
(A) Mangroves (B) Rain forest (C) Grassland (D) Coral reefAns: B
91. In azeotropic distillation the third component is added ....
(A) To decrease the value of relative volatility of original components.
(B) To change the value of the vaporization equilibrium constant of the two components
(C) To form another azeotrope with one of the components
(D) To increase the value of relative volatility of the original two components
Ans: C
92. All crystals of a definite substance ....
(A) Have the same sizes of the faces as well as the same interfacial angles
(B) Do not have the same interfacial angles
(C) Have the same interfacial angles
(D) Have the same sizes of the faces
Ans: C
93. Knudsen diffusion co-efficient .....
(A) Is independent of temperature and pressure (B) Depends on temperature and pressure
(C) Depends on temperature but independent of pressure (D) Depends on pressure but independent on temperature
Ans: C
94. Overall tray efficiency is defined as ....
(A) The ratio of the number of ideal trays required to the number of real trays required
(B) The ratio of the number of real trays required to the number of ideal trays required
(C) The ratio of the number of ideal trays required to the number of overall gas transfer units
(D) The ratio of number of overall gas transfer units to the number of ideal trays required
Ans: A
95. A large effect of temperature is observed on overall mass transfer co-efficient. This indicates that ....
(A) No resistance in liquid phase (B) More resistance in liquid phase
(C) Appreciable resistance is both phases (D) Less resistance in liquid phase
Ans: B
96. Stripping factor is defined as ....
(A) The ratio of slope of the equilibrium curve to the slope of the operating line.
(B) The product of slopes of the operating line and equilibrium curve
(C) The reciprocal of the product of the slopes of the operating line and equilibrium curve
(D) The ratio of the slope of the operating line to the slope of equilibrium curve
Ans: A
97. A react A __________ B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of reaction will be ....
(A) 1.5 (B) 2 (C) 1 (D) 0
Ans: D
98. The units of frequency factor in the Arrhenius equation ....
(A) Depend on the temperature and pressure of the reaction (B) Depend on order of reaction
(C) Are the same as those of the rate constant (D) Are cycles per unit time
Ans: C
99. A first order liquid phase reaction is carried out in an ideal continuous stirred tank reactor. If a part of the outlet stream is recycled back to the reactor, the conversion will ....
(A) Decrease
(B) Increase
(C) May increase or decrease depending on the value of the recycle ratio
(D) Remain unchanged
Ans: D
100. Chemically neoprene is referred as –
(A) Styrene Butadiene Rubber (SBR)
(B) Polyurethane
(C) Polychloroprens
(D) Polybutadiene
Ans: C
(A) Viscosity of liquid (B) Thermal conductivity of liquid (C) Density of liquid (D) Surface tension of liquid
Ans: D
54. For laminar flow of a shear-thinning liquid in pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor at
(A) < 2
(B) > 2
(C) 2
(D)1 /2
Ans: A
55. Which one of the following is a co-polymer ?
(A) Bakelite (B) Teflon (C) Polythene (D) PVC
Ans: A
56. Weber number can be used to estimate ....
(A) Ratio of inertial and centrifugal forces (B) Ratio at pressure and surface tension forces
(C) Ratio of inertial and surface tension forces (D) Ratio of inertial and compressibility forces
Ans: C
57. A globe value is most suitable for application in which ....
(A) One way flow is required (B) Flow control is required
(C) The valve is required to be either fully open or fully closed (D) The fluid contains dispersed particles
Ans: B
58. To increase the capacity of a commercial packed bed adsorber, the volumetric flow rate at gas entering is increased by 20%. The ratio of pressure drops (new to old) will be ...
(A) 1.73 (B) 1.09 (C) 1.44 (D) 1.2
Ans: C
59. The equilibrium position of the float in a rotameter is determined by the balance of three forces. These are ....
(A) Buoyancy, gravity and centrifugal forces (B) Pressure, gravity and centrifugal forces
(C) Buoyancy, drag and gravity forces (D) Buoyancy, drag and centrifugal forces
Ans: C
60. A fluid is defined as ....
(A) Is a substance that does not permanently resist distortion
(B) Is called incompressible if its viscosity is little affected by moderate changes in temperature and pressure
(C) Is called ideal if its density is zero
(D) In equilibrium is not free from shear stresses
Ans: A
61. Rotary pump is an example of which are of the following ?
(A) Piston pump (B) Diaphragm pump (C) Plunger pump (D) Gear pump
Ans: D
62. Manometers are used to measure ....
(A) Pressure Difference (B) Atmospheric Pressure (C) Viscosity (D) Flow rate
Ans: A
63. Above 50° C, flash point is determined by ....
(A) Lovibond tintometer (B) Saybolt chromometer (C) Abel apparatus (D) Pensky-Martens apparatus
Ans: D
64. The work required for crushing of solid is proportional to the new surface created is known as....
(A) Bond’s law (B) Janssen’s law (C) Kick’s law (D) Rittinger’s law
Ans: D
65. Arrange the following size reduction equipments in the decreasing order of the average particle size produced by each of them.
(A) Fluid energy mills, Ball mills, Jaw crushers
(B) Ball mills, Jaw crushers, Fluid energy mills
(C) Jaw crushers, Ball mills, Fluid energy mills
(D) Fluid energy mills, Jaw crushers, Ball mills
Ans: C
66. In a disintegrator the size reduction is effected by ...
(A) cutting action (B) compression only (C) attrition only (D) compression, impact and shear
Ans: D
67. The surface area of a unit mass of particles ...
(A) Increases as the particle size is reduced (B) Decreases as the particle size is reduced
(C) Decreases as the square root of the equivalent diameter of particle (D) Remains constant as the particle size to reduced
Ans: A
68. The co-efficient of friction between two layers of solid particles is equal to ...
(A) The ratio of applied pressure and the normal pressure (B) The ratio of normal pressure and applied pressure
(C) The tangent of the angle of internal friction of the particles (D) The tangent of the angle of repose of the particles
Ans: C
69. In a ball mill forces acting on the ball are ...
(A) Gravitational and centrifugal forces (B) Gravitational and drag forces
(C) Gravitational, drag and centrifugal forces (D) Drag and centrifugal forces
Ans: A
70. Plate and frame filter press is classified as ...
(A) Discontinuous vacuum filter (B) Continuous vacuum filter (C) Discontinuous pressure filter (D) Continuous pressure filter
Ans: C
71. The Grashof number is defined as the ratio of
(A) Buoyancy to viscous forces (B) Buoyancy to surface tension forces (C) Buoyancy to inertial forces (D) Inertial to viscous forces
Ans: C
72. Fresh orange juice contains 12% (by weight) solid and the rest water. 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is ....
(A) 0.6 (B) 0.7 (C) 0.5 (D) 0.4
Ans: B
73. For condensation of pure vapours, if the heat transfer co-efficients in filmwise and dropwise condensation are respectively hf and hd, then
(A) hf > hd
(B) hf could be greater or smaller than hd
(C) hf = hd
(D) hf < hd
Ans: D
74. The non-dimentional temperature gradient in a liquid at the wall of a pipe is referred as ....
(A) The prandtl number (B) The schmidt number
(C) The nusselt number (D) The heat flux
Ans: C
75. According to Duhring’s rule, the boiling point of a given solution is ....
(A) An exponential function of the boiling point of pure water at the same pressure.
(B) A linear function of the concentration of the solute.
(C) A linear function of the pressure.
(D) A linear function of the boiling point of pure water at the same pressure.
Ans: A
76. Near the entrance of a piped where fluid is being heated, the temperature profile is not fully developed and the local heat-transfer co-efficient is ....
(A) Zero
(B) Infinite
(C) Greater than the heat transfer co-efficient for fully developed turbulent flow
(D) Smaller than the heat transfer co-efficient for fully developed turbulent flow
Ans: C
77. Natural silk is a polymer of ..........
(A) Nucleotide (B) Adipic acid (C) Nucleoside (D) Amino acid
Ans: D
78. Which one among the following is not a reinforcing fibre for plastic ?
(A) Polymeric fibres (B) Carbon fibres (C) Glass fibres (D) Nichrome fibres
Ans: D
79. A black body does not ....
(A) Follow Stefan-Boltzmann’s law (B) Reflect radiation (C) Emit radiation (D) Absorb radiation
Ans: B
80. Which one of the following tube configurations in a heat exchanger results in the maximum heat transfer rate ?
(A) Rectangular pitch (B) Rhombus pitch (C) Square pitch (D) Triangular pitch
Ans: D
81. Assume that benzene is immisible in water. The normal boiling point of benzene and water are 80.1° C and 100° C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water will be ....
(A) less than 80.1° C
(B) Greater than 80.1° C but less than 100° C
(C) 80.1° C
(D) 100° C
Ans: A
82. The recovery of penicillin from the acidified fermentation broth is done by ...
(A) Liquid extraction (B) Absorption (C) Evaporation (D) Distillation
Ans: A
83. Molecular diffusivity of a liquid ....
(A) Decreases with temperature (B) Is independent of temperature
(C) Increases with temperature (D) May increase or decrease with temperature
Ans: C
84. The number of ideal plates required for specified separation in a plate column can be calculated by the use of ....
(A) Underwood equation (B) Murphree equation (C) Kremser-Brown-Souders equation (D) Rayleigh equation
Ans: C
85. In absorber the equilibrium curve is always ....
(A) Above the operating line (B) A straight line (C) Below the operating line (D) Parallel to the operating line
Ans: A
86. A component of gas mixture absorbed in a solvent is usually desorbed to reuse the solvent. Two methods used to desorb the absorbed components are (a) and (b)
(A) (a) pressure increase (b) temperature reduction
(B) (a) pressure reduction (b) temperature increase
(C) (a) pressure reduction (b) temperature reduction
(D) (a) pressure increase (b) temperature increase
Ans: B
87. Adiabatic saturation process of atmospheric air is a process of constant ....
(A) Dew-point temperature (B) Dry-bulb temperature (C) Relative humidity (D) Wet-bulb temperature
Ans: D
88. If the McCabe-Thiele assumptions are valid, the molal flow rates of liquid stream in the enriching and stripping sections are equal for .... (A) Saturated liquid feed (B) Superheated vapour feed (C) Subcooled liquid feed (D) Saturated vapour feed
Ans: D
89. Which one among the following is the raw material for the manufacture of caprolactam, obtained from .......... ?
(A) Pyridine (B) Naphthalene (C) Benzene (D) Phenol
Ans: C
90. Which one of the following ecosystem has the highest gross primary productivity ?
(A) Mangroves (B) Rain forest (C) Grassland (D) Coral reefAns: B
91. In azeotropic distillation the third component is added ....
(A) To decrease the value of relative volatility of original components.
(B) To change the value of the vaporization equilibrium constant of the two components
(C) To form another azeotrope with one of the components
(D) To increase the value of relative volatility of the original two components
Ans: C
92. All crystals of a definite substance ....
(A) Have the same sizes of the faces as well as the same interfacial angles
(B) Do not have the same interfacial angles
(C) Have the same interfacial angles
(D) Have the same sizes of the faces
Ans: C
93. Knudsen diffusion co-efficient .....
(A) Is independent of temperature and pressure (B) Depends on temperature and pressure
(C) Depends on temperature but independent of pressure (D) Depends on pressure but independent on temperature
Ans: C
94. Overall tray efficiency is defined as ....
(A) The ratio of the number of ideal trays required to the number of real trays required
(B) The ratio of the number of real trays required to the number of ideal trays required
(C) The ratio of the number of ideal trays required to the number of overall gas transfer units
(D) The ratio of number of overall gas transfer units to the number of ideal trays required
Ans: A
95. A large effect of temperature is observed on overall mass transfer co-efficient. This indicates that ....
(A) No resistance in liquid phase (B) More resistance in liquid phase
(C) Appreciable resistance is both phases (D) Less resistance in liquid phase
Ans: B
96. Stripping factor is defined as ....
(A) The ratio of slope of the equilibrium curve to the slope of the operating line.
(B) The product of slopes of the operating line and equilibrium curve
(C) The reciprocal of the product of the slopes of the operating line and equilibrium curve
(D) The ratio of the slope of the operating line to the slope of equilibrium curve
Ans: A
97. A react A __________ B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of reaction will be ....
(A) 1.5 (B) 2 (C) 1 (D) 0
Ans: D
98. The units of frequency factor in the Arrhenius equation ....
(A) Depend on the temperature and pressure of the reaction (B) Depend on order of reaction
(C) Are the same as those of the rate constant (D) Are cycles per unit time
Ans: C
99. A first order liquid phase reaction is carried out in an ideal continuous stirred tank reactor. If a part of the outlet stream is recycled back to the reactor, the conversion will ....
(A) Decrease
(B) Increase
(C) May increase or decrease depending on the value of the recycle ratio
(D) Remain unchanged
Ans: D
100. Chemically neoprene is referred as –
(A) Styrene Butadiene Rubber (SBR)
(B) Polyurethane
(C) Polychloroprens
(D) Polybutadiene
Ans: C