A multiple effect evaporator has a capacity to process 4000 kg of solid
caustic soda per day, when it is concentrating from 10% to 25% solids. The
water evaporated in kg per day is
(A) 6000
(B) 24000
(C) 60000
(D) 48000
Description : . An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is (A) 4000 (B) 9000 (C) 4600 (D) 3000
Last Answer : (A) 4000
Description : In a laboratory test run, the rate of drying was found to be 0.5 x 10 - 3 kg/m2 .s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry ... of the solids from 0.3 to 0.2 (dry basis) is (A) 2000 (B) 4000 (C) 5000 (D) 6000
Last Answer : (C) 5000
Description : Kg of liquid evaporated per hour in an evaporator is defined as its (A) Capacity (B) Economy (C) Steam load (D) None of these
Last Answer : (A) Capacity
Description : A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides (A) Higher economy (B) Lower capacity (C) Both (A) & (B) (D) Lower economy
Last Answer : (A) Higher economy
Description : Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. ... from 1 kg fresh juice is (A) 0.4 (B) 0.5 (C) 0.6 (D) 0.7
Last Answer : (D) 0.7
Description : The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler. (A) Evaporative capacity (B) Evaporation efficiency (C) Thermal efficiency (D) Steam load
Last Answer : (A) Evaporative capacity
Description : Ronit spends his money from his saving in different way that is he spends 25% on travel,15% on food,20% on wages and 17% on shopping a clothes and after that all expenditure he saved 6900.Find the how much he spent on clothes. A) 4400 B) 5100 C) 4000 D) 6000
Last Answer : B) Let the total income of Ronit x then total expenditure from income X x (25%+15%+20%+17%)=X*77% X x 77% =Total savings= X x 23% X = 6900 x 100 / 23 = 30000 expenditure on clothes = 17% so,30000 x 17 / 100 = 5100
Description : . A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because (A) Total heat transfer area of ... in a single effect is much lower than that in any effect in a multi-effect system
Last Answer : (B) Total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect
Description : Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it (A) Has larger production capacity per unit cell (B) Consumes less power per ton of Cl2 produced (C) Produces high purity (70%) caustic soda directly (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Platinum and silver are corroded by (A) Caustic soda solution (B) Phosphoric acid (C) Sulphuric acid (10%) (D) None of these
Last Answer : (D) None of these
Description : Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg. (A) 1000 (B) 4000 (C) 6000 (D) 8000
Last Answer : (B) 4000
Description : The surface temperature of the sun is estimated as – (1) 6000 °C (2) 12000 °C (3) 18000 °C (4) 24000 °C
Last Answer : (1) 6000 °C Explanation: The surface of the sun is called the photosphere. The photosphere is 340 miles thick and it's temperature s range from 5,500°C to 6,000°C. It has dark spots called sunspots which are the only solar activity observable by the naked eye.
Description : The surface temperature of the sun is estimated as (1) 6000 °C (2) 12000 °C (3) 18000 °C (4) 24000 °C
Last Answer : 6000 °C
Description : The actual temperature drop across the heating surface of an evaporator depends on the (A) Liquid depth over the heating surface (B) Solution being evaporated (C) Pressure difference between the steam chest and the vapor space above the boiling liquid (D) All (A), (B) and (C)
Description : The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area in m2 , V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m3 ) (A) 3.6 AVS.ρ (B) 3.6 A.V.ρ (C) 3.6 A.S. ρ (D) 3.6 AVS/ρ
Last Answer : (A) 3.6 AVS.ρ
Description : In a multiple effect evaporator, the effect of boiling point elevation is to (A) Reduce the capacity (B) Reduce the economy (C) Increase the economy (D) None of these
Last Answer : (A) Reduce the capacity
Description : A multiple effect evaporator as compared to a single effect evaporator of the same capacity has (A) Lower heat transfer area (B) Lower steam economy (C) Higher steam economy (D) Higher solute concentration in the product
Last Answer : (C) Higher steam economy
Description : Optimum number of effects in a multiple effect evaporator is decided by the (A) Cost benefit analysis (B) Floor area availability (C) Terminal parameters (D) Evaporation capacity required
Last Answer : (A) Cost benefit analysis
Description : The number of kg vaporised per kg of steam fed to the evaporator is defined as (A) Capacity (B) Rate of evaporation (C) Economy (D) Rate of vaporisation
Last Answer : (C) Economy
Description : The law of multiple proportions is illustrated by the two compounds [NCERT 1972] (A) Sodium chloride and sodium bromide (B) Ordinary water and heavy water (C) Caustic soda and caustic potash (D) Sulphur dioxide and sulphur trioxide
Last Answer : (D) Sulphur dioxide and sulphur trioxide
Description : Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%? (A) Cast iron (B) Steel (C) Nickel (D) Karbate
Last Answer : (C) Nickel
Description : Evaporator used for concentrating tomato juice is made of (A) Nickel (B) Brass (C) Stainless steel-glass lined (D) Cast iron-rubber lined
Last Answer : (C) Stainless steel-glass lined
Description : For concentrating an aqueous solution of a material like anhydrous Na2SO4, whose solubility decreases with rise in temperature, the most suitable evaporator is a __________ evaporator. (A) High pressure (B) Vacuum (C) Backward feed (D) None of these
Last Answer : (B) Vacuum
Description : Agitated film evaporator is suitable for concentrating __________ liquids. (A) Foaming (B) Viscous (C) Very thin (D) Corrosive
Last Answer : (B) Viscous
Description : 200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 10 -3 kg/m2 .s. The initial ... moisture/kg dry solid). (A) 0.5 (B) 0.05 (C) 0.1 (D) 0.15
Last Answer : (C) 0.1
Description : Le-Blanc process is a primitive process for the manufacture of (A) Caustic soda (B) Soda ash (C) Bromine from sea water (D) Hydrochloric acid
Last Answer : (B) Soda ash
Description : Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda? (A) High cost of mercury (B) High specific gravity of mercury (C) Non-availability of high purity mercury (D) Pollution of water stream by mercury
Last Answer : (D) Pollution of water stream by mercury
Description : Reason for operating an evaporator in multiple effects is to secure (A) Increased steam economy (B) Decreased steam consumption (C) Both (A) and (B) (D) Increased capacity
Last Answer : (C) Both (A) and (B)
Description : Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively). (A) C/E (B) E/C (C) CE (D) 1/CE
Last Answer : (A) C/E
Description : Pick out the wrong statement. (A) Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling (B) Thermal conductivity of a dry material is more than ... in kg/hr in an evaporator (D) Vaporisation of organic substances in evaporator mostly causes foam formation
Last Answer : (B) Thermal conductivity of a dry material is more than that of the damp material
Description : Complete removal of __________ from gasoline is done by Unisol process using caustic soda and methyl alcohol. (A) Waxes (B) Mercaptans (C) Asphalt (D) Diolefins
Last Answer : (B) Mercaptans
Description : Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda? (A) Diaphragm electrolytic cell process (B) Mercury electrolytic cell process (C) Lime-soda process (D) None of these
Last Answer : (C) Lime-soda process
Description : Solvay process is used for the manufacture of (A) Caustic soda (B) Soda ash (C) Caustic potash (D) Soda lime
Description : In Kraft process of paper manufacture, white cooking liquor consists of caustic soda (A) Sodium sulphide & sodium carbonate (B) Sodium sulphite & sodium carbonate (C) Sodium sulphite & sodium sulphide (D) None of these
Last Answer : (A) Sodium sulphide & sodium carbonate
Description : Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials. (A) Coke and sand (B) Brine and coal (C) Coke and caustic soda (D) None of these
Last Answer : (B) Brine and coal
Description : An ant‘s sting can be treated with ............which will neutralise the effect of the chemical injected by the ant‘s sting into our skin. (a). Methanoic acid (b). formic acid (c). Baking soda (d). Caustic soda
Last Answer : (c). Baking soda
Description : The half`-` life periods of four isotopes are give below `:` `(i) 7.6 years` , ` ii. 4000 years` `iii. 6000 years`,`iv. 3.2xx10^(5) years` Which of th
Last Answer : The half`-` life periods of four isotopes are give below `:` `(i) 7.6 years` , ` ii. 4000 years` `iii. ... is most stable ? A. iv B. iii C. ii D. i
Description : Roundabouts are not suitable if number of vehicles exceed (A) 3000 (B) 4000 (C) 5000 (D) 6000
Last Answer : Answer: Option A
Description : Refer to the following TAF for Zurich LSZH 261019 20018G30KT 9999 –RA SCT050 BKN080 TEMPO 23012KT 6000 –DZ BKN015 BKN030 BECMG 1518 23020G35KT 4000 RA OVC010= The lowest visibility forecast at ETA Zurich 1430 UTC is: a. 6km b. 6nm c. 4km d. 10km
Last Answer : a. 6km
Description : Ravi, Rakesh and Vijay invest in a partnership in the ratio 7/2, 4/3, 6/5 respectively. After 4 months, Ravi increases his share 50%. If the total profit at the and of one year be Rs. 32,400, then what is Rakesh's ... the profit? 1) Rs. 2000 2) Rs. 3000 3) Rs. 4000 4) Rs. 5000 5) Rs. 6000
Last Answer : 5) Rs. 6000
Description : An amount of money is to be distributed among P, Q and R in the ratio of 5:4:7 respectively. If the total share of P and R is 3 times the share of Q, what is definitely Q’s share? a) 2000 b) 4000 c) 6000 d) Data inadequate e) None of these
Last Answer : Answer: D
Description : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. ... .kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91
Last Answer : (B) 0
Description : Simple interest on a certain sum of money for 4 years at 5% per annum is half the compound interest on Rs. 8000 for 2 years at 10% per annum. The sum placed on simple interest is: a) Rs.4200 b) b)Rs.4250 c) Rs.5250 d) Rs.5200 e) Rs.4000
Last Answer : a C.I = 8000 * (1+(10/100))2 –8000 = 8000 *110/100 * 110/100 – 8000 = 9680 – 8000 = Rs.1680 Therefore, S.I = C.I / 2 = 1680 / 2=Rs. 840 840 = sum * 4 * 5 / 100 :. Sum = Rs.(840 * 100)/ (4 *5) = Rs.4200
Description : Within the red blood cells the buffering capacity contributed by the phosphates is (A) 5% (B) 10% (C) 20% (D) 25%
Last Answer : Answer : D
Description : Reduction of load capacity in a ruling gradient of (A) 1 in 10, is 10% (B) 1 in 15, is 15% (C) 1 in 20, is 10% (D) 1 in 25, is 25%
Last Answer : Answer: Option C
Description : When you sell capacity what percentage of your original investment do you receive? a. 65% c. 50% b. 25% d. 10%
Last Answer : a. 65%
Description : Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam. (A) 0.4 - 0.6 (B) 1-1.3 (C) 1.8-2 (D) 2 - 2.4
Last Answer : (B) 1-1.3
Description : Choose the correct option relating to the minimum and maximum number of bags, which an office will be authorized to keep will generally a) For Unit Bag Offices and District Bag Offices Min No. of ... bags dispatched in case of deficit offices and Maximum: No limit. d) All the above are correct
Last Answer : d) All the above are correct