| Post Name | Assistant Manager (Chemical) - Kerala Ceramics Limited |
|---|---|
| Question Paper Code | 001/2022/OL |
| Category Code | 381/2020 |
| Date of Test | 11 January 2022 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Calculate the density and specific weight of Nitrogen at an absolute pressure of 1 MPa and a temperature of 40°C. 3 3
Answer
D. 10.75 kg/𝑚 3 and 105.4 N/𝑚 3
2
Which of the following factors does not contribute to the pressure drop in a pipeline ?
Answer
D. None of these
3
The no-slip condition of fluid in direct contact with a solid surface, stick to the surface is due to
Answer
C. Viscosity
4
Hydraulic radius of a pipe is the ratio of
Answer
B. Flow area to wetted perimeter
5
To handle smaller quantity of fluid at higher discharge pressure, use a ________ pump.
Answer
A. Reciprocating
6
A U-tube manometer contains kerosene, mercury and water, each at 21.2°C. It is connected between pipes A and B, where P_B − P_A = 31.02 kPa. Find the mercury elevation difference z. Densities: kerosene = 809 kg/m³, mercury = 13550 kg/m³, water = 1000 kg/m³.
Answer
A. 0.261 m
7
Equation for pressure drop in a packed bed for laminar flow is given by the
Answer
A. Kozzeny-Karman
8
Which of the following valve facilitates close control of fluid flow ?
Answer
B. Globe valve
9
Boiler feed water pump is usually a __________ pump.
Answer
C. Multistage centrifugal
10
The discharge through a V-notch weir varies as 3
Answer
C. 𝐻 2 2
11
Two particles settling under laminar condition are called equally falling particles, if they are having
Answer
D. None of these
12
Choose the most suitable industrial screening equipment for separating fine materials.
Answer
D. Vibrating screen
13
Which among the following sentences are not true regarding size reduction ?
Answer
D. None of the above
14
A material that sinks in water in floatation process are known as
Answer
A. Tailing
15
The angle that is tangent to the roll surface at the points of contact between the rolls anf the particle is known as
Answer
B. Angle of nip
16
Which of the following mills are termed as disintegrators ?
Answer
C. Cage
17
What is the effect of pressure drop on the filtration rate ?
Answer
C. Varies depending on the compressibility
18
The power number (𝑁� ) for an agitator is a function of
Answer
A. Reynold's number
19
A bin with a bottom aperture diameter B, discharge free-flowing solids at a rate proportional to
Answer
C. 𝐵 2
20
Slugging in fluidized bed can be prevented by
Answer
C. Shallow beds of solids and proper choice of particle size
21
1 BTU/lb°F is equivalent to __________ kcal/kg°C.
Answer
C. 1
22
What are the volumetric flow rate (m³/s) and cross-sectional area (m²) of a pipe if a solution of density 1.5 kg/m³ flows at 5 m/s with a mass flow rate of 500 g/min?
Answer
C. 5.55 × 10⁻³ m³/s and 1.11 × 10⁻³ m²
23
Pick out the correct statements from the following. (i) Temperature is extensive property and density is intensive property. (ii) Temperature is intensive property and mass is extensive property. (iii) Density and specific heat capacity are intensive property. (iv) Temperature and mass are extensive property.
Answer
C. (ii) and (iii)
24
Pick out the wrong statements from the following. (i) Bound moisture is removed during constant rate drying period. (ii) Free moisture is removed during falling rate drying period. (iii) The some of free moisture and equilibrium moisture in a solid is called the critical moisture. (iv) The driving force for mass transfer in a wet solid is its free moisture content.
Answer
D. (i), (ii) and (iii)
25
In a given plant, 1906 kg of Nitrogen and 475 kg of Hydrogen are fed to the synthesis reactor per hour. Production of pure ammonia from this reactor is 1633 kg/h. What is the percent excess reactant ?
Answer
A. 16.2%
26
Calculate the number of moles of K₂CO₃ in 650 g. Take the atomic weights K = 39.1, C = 12 and O = 16.
Answer
C. 4.7 mol
27
Natural gas is piped from the well at temperature 300 K and pressure 400 kPa. The gas is found to contain 90% Methane, 5.5% Ethane and the rest Nitrogen. Calculate the partial pressure of Nitrogen.
Answer
D. 18 kPa
28
Which of the following statements is correct according to Dalton's law?
Answer
A. Pₜ = P₁ + P₂ + … + Pᵢ + … + Pₙ
29
A crystallizer is charged with 100 kg of a solution containing 25% 𝐵𝑎�𝑁𝑂3 )_2 in water. On cooling 10% of the original water present evaporates. Calculate the yield of crystals when the solution is cooled to 283 K. The solubility at 283 K is 7 kg 𝐵𝑎�𝑁𝑂3 � /100 kg total water. 2
Answer
A. 20.28 kg
30
Which of the petroleum product, the Octane no is an important test ?
Answer
C. Gasoline
31
Crude petroleum consists of carbon and hydrogen composition
Answer
A. 84 – 87% carbon and 11 – 14% hydrogen
32
Polymerisation of petroleum products leads to
Answer
A. Causes olefins to combine with each other
33
The measure of aromatic content in diesel is known as
Answer
D. Aniline point
34
The average calorific value of Anthracite coal will be in the range
Answer
A. 8330 – 8670 kcal/kg
35
The ultimate analysis of a coal sample is as follows : Carbon : 72%; Hydrogen : 5%; Oxygen : 5.9%; Nitrogen : 1.5%; Sulphur : 5.5%; Water : 2.1%; Ash : 8%. Calculate the total oxygen required for burning of carbon, hydrogen and sulphur to produce 𝐶𝑂2 , 𝐻2 𝑂 and 𝑆𝑂2 respectively.
Answer
B. 2.31624 kg
36
Solar refrigeration can be accomplished using either __________ source supplied from a solar collector or _________ supplied from photovoltaics.
Answer
A. Thermal energy and electricity
37
Which of the following compounds is added in LPG to impart a distinct colour ?
Answer
B. Ethyl mercaptan
38
The purpose of refractory lined chamber in furnace is
Answer
A. To enhance the heat energy by radiation
39
Furnaces have in common the general features of heat transfer from __________ to ________.
Answer
A. Hot gas source to a cold sink
40
Which of the following sources are effective for harnessing the energy from Ocean ? (i) Ocean waves (ii) Tidal range (rise and fall) (iii) Humidity (iv) Wind
Answer
A. (i) and (ii)
41
Which one of the following is not an assumption in multiple effect evaporator's calculations ?
Answer
D. Pressure is same in every effect
42
A hollow sphere of internal diameter ID = 20 cm and outer diameter OD = 30 cm contains hot fluid. What should be the critical radius of insulation for maximum rate of heat transfer? Thermal conductivity k = 0.86 W/mK and convection heat-transfer coefficient of the outer fluid hₒ = 20 W/m²K.
Answer
C. 8.6 cm
43
A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/𝑚 and 0.4 kJ/kg.K 2 respectively. The heat transfer co-efficient is 50 W/𝑚 .K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is
Answer
D. 015
44
An athlete is sitting unclothed in a locker room whose dark walls are at a temperature of 15°C. Estimate his rate of heat loss by radiation, assuming a skin temperature of 34°C and ε= 0.70. Take the surface area of the body not in contact with the chair to be 1.5 𝑚 2 .
Answer
A. 120 W
45
A shirtless rider under a circus tent feels the heat radiating from the sunlit portion of the tent. Calculate the temperature of the tent canvas based on the following information : The shirtless rider's skin temperature is 34.0°C and has an emissivity of 0.970. The exposed area of skin is 0.400 𝑚 2. He receives radiation at the rate of 20.0 W - half what you would calculate if the entire region behind him was hot. The rest of the surroundings are at 34.0°C.
Answer
A. .48.5°C
46
A room heater has 6 thin-wall copper tubes, each 1.0 m long and 4.0 cm in diameter. Hot water at 77°C circulates through them. Calculate the heat radiated per second when the room is at 27°C. Copper emissivity = 0.8 and Stefan's constant = 5.67 × 10⁻⁸ W·m⁻²·K⁻⁴.
Answer
A. 236 J/s
47
In a _____________ heat exchanger, both fluids flow alternatively through the same flow passages and hence heat transfer is intermittent.
Answer
C. Storage Type
48
Which of the following is not a classification based on construction of the heat exchanger ?
Answer
C. Multipass
49
Pick out the wrong statement.
Answer
B. The maximum is the emissive power of a surface at a temperature 𝑇1 occurs at a wavelength of λ_1 . If the surface temperature is halved, the maximum in the emissive power would occur at a wavelegth of 0.5 λ_1 .
50
What is the steam consumption of an evaporator if the evaporator capacity is 30 kg/hr and the steam consumption is 45 kg/hr ?
Answer
Question Cancelled
51
Diffusivity of a binary gas mixture is 2.83 × 10⁻⁵ m²/s at 300 K. What is the approximate diffusivity at 600 K?
Answer
C. 8 × 10⁻⁵ m²/s
52
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is
Answer
C. 1.24
53
Find the HTU, if gas rate is 0.07 kmol/sq.m.s and Fg*a (F type mass transfer co-efficient is 0.06 kmol/cu.m.s).
Answer
A. 1.167
54
The solubility curve for highly soluble gas in liquid
Answer
A. lies closer to the liquid concentration axis
55
Stacked packing compared to dumped packing
Answer
Question Cancelled
56
Heterogeneous azeotropes exist when the vapor is in equilibrium with
Answer
C. Dual phase
57
The evaporator used in household refrigerators is
Answer
A. Frosting evaporator
58
A mixture consists of 30 kg A, 50 kg B and 20 kg C. (A = carrier liquid in the feed, B = extraction solvent, C = solute extracted). On the Janecke diagrams the coordinates of the mixture point are
Answer
A. x = 0.4, N = 1
59
The heat conduction in dry air is
Answer
A. less rapid than in steam
60
Tubular adsorber follows which isotherm ?
Answer
C. Linear adsorption
61
Systemic insecticide
Answer
A. are absorbed throughout the plant
62
Sizing materials are incorporated in paper to
Answer
A. imparts resistance to penetration by liquids
63
Trinitrotoluene is made by the nitration of
Answer
Question Cancelled
64
Fumigant insecticides
Answer
B. emits poisonous vapour
65
Oils are partially hydrogenated to manufacture vanaspati, because fully saturated solidified oil
Answer
A. cause cholesterol built up and blood clotting
66
Lubricant greases are a mixture of
Answer
D. mineral oil, soap and additives
67
Frasch process is for
Answer
D. mining Sulphur
68
Paper grade bamboo contains about ________ % cellulose.
Answer
C. 5
69
Fish contain about __________ % oil.
Answer
C. 20
70
10% oleum comprises of 10%
Answer
B. 𝑆𝑂3
71
Percentage of alcohol in beer may be around ___________ %.
Answer
C. 2-8
72
___________ is used as a catalyst in fat splitting.
Answer
A. ZnO
73
Good quality of edible salt is obtained from brine by the process of
Answer
B. Vacuum evaporation
74
Which of the following grades of nitric acid is described as "fuming" ?
Answer
C. Acid over 86% concentration
75
Zeolite used in water softening process is regenerated by washing with
Answer
D. Brine
76
Electric bulbs are made up of ________ glass.
Answer
B. flint
77
Electroplating is never done on
Answer
C. refractories
78
Which of the following contains least amount of 𝑁2 ?
Answer
A. Coke oven gas
79
Fire clay is ____________ refractory materials.
Answer
B. acidic
80
Which among the following foam of sulphur is more stable at room temperature ?
Answer
C. Rhombic
81
Which is the best and the most effective method for the removal of organic contaminants present into polluted water in very small quantities (say <200 mg/L) ?
Answer
B. Activated carbon adsorption
82
Industrial chimney located near tall buildings should be at least _________ times the height of the building.
Answer
B. 2.5
83
Most efficient and suitable dust removal equipment for removal of flyash from flow gas in a thermal power plant is the
Answer
C. Electrostatic precipitator
84
Which of the following dust collection equipments is the least efficient for submicronic particles ?
Answer
A. Dust catcher
85
Acute danger to humans life exists, is the concentration of the 𝐶𝑂2 in atmospheric air exceeds ____________% (by Volume).
Answer
D. 20
86
The max. allowed noise level to which a man working in a chemical plant can be exposed for 8 hrs/day is about
Answer
B. 90 decibels
87
Match the following (Choose the most suitable answer). P. Bakelite i. Perspex Q. PVC ii. Thermoset R. PMMA iii. Neoprene S. Polychloroprene iv. chloroethane
Answer
C. P-ii, Q-iv, R-i, S-iii
88
Find the wrong pair. P. Nylon 6 : Condensation polymer Q. Starch : Condensation polymer R. Dacron : Condensation polymer S. Teflon : Condensation polymer
Answer
D. P and S
89
Choose the right pair. P. Dacron : Terylene Q. PTFE : Teflon R. PMMA : Lucite
Answer
C. P, Q and R
90
Maximum consumption of polymers is in
Answer
C. Coating and films
91
Which of the following radioactive wastes emits all α, β and γ rays and hence is the most hazardous of all radioactive emitters ?
Answer
D. Ra-226
92
Which of the following is a characteristic of an instrument ?
Answer
Question Cancelled
93
Find out the radius of the cylinder in which a liquid of 40g is filled upto 5 cm. Specific gravity is 20.
Answer
A. 0.356 cm
94
Which is not a use of Flame photometry ?
Answer
D. Analysis of complex mixtures
95
Find the correct order of Mass spectrometric procedure. (i) The ion signal is processed into mass spectra. (ii) The ions are detected usually by a quantitative method. (iii) The ions are separated according to their mass to charge ratio in an analyzer by electromagnetic fields. (iv) The components of the sample are ionized by one of a variety of methods (E.g. by impacting them with an electron beam) which result in the formation of charged particles. (v) A sample is loaded into the MS instrument and undergoes vaporization.
Answer
B. (v) > (iv) > (iii) > (ii) > (i)
96
Find out the wrong statement.
Answer
B. In passive transducers, internal parameters like resistance, inductance and capacitance doesn't change because of the input signal.
97
The LD50 for retinol is 2000 mg/kg, how many chewable tablets would a 10 kg kid have to consume to reach the LD50 if each tablet contains 1 mg of retinol ?
Answer
B. 20000
98
How many breaths/seconds do you give an adult during Artificial Respiration for 2 minutes ?
Answer
A. 1 breath/5 sec
99
Gauge factor is given by
Answer
B. (Change in resistance caused by strain/Resistance of the undeformed gauge)/strain
100
The repeating units of PTFE are
Answer
B. 𝐹2 𝐶 – 𝐶𝐹2
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