Description : In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced. (A) Concentrate (B) Tailing (C) Middling (D) None of these
Last Answer : (C) Middling
Description : Pick out the correct statement: (A) Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products (B) The operating cost of ... upon the specific gravity of the minerals (D) Asphalt is best crushed using toothed roll crusher
Last Answer : (A) Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products
Description : It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of ... 3.06 10 5 (B) 6.12 10 5 (C) 7.24 10 5 (D) 9.08 10
Last Answer : (A) 3.06 × 10
Description : How can a dairy farmer reduce fodder consumption by his cattle and also increase milk production? (1) By increasing the supply of feed concentrate (2) By stall feeding (3) By allowing the cattle to graze in the fields (4) By administering hormones
Last Answer : (3) By allowing the cattle to graze in the fields Explanation: Like dry fodder is used to fill the empty space in the stomach of cattle, green fodder can also achieve the same result. Fat ... to milk. Green fodder can nicely substitute dry fodder and at the same time keeping the cattle satisfied.
Description : Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about (A) 8800 kcal/m3 (B) 8800 kcal/kg (C) Same as that of coal middling (D) 25000 kcal/kg
Last Answer : (B) 8800 kcal/kg
Description : Which of the following fuels is generally not used in thermal power plant boiler firing? (A) Furnace oil, light diesel oil and tar/PCM (B) Pulverised coking coal (C) Coal middling from washeries (D) B.F. gas, coke oven gas and L.D. converter gas
Last Answer : (B) Pulverised coking coal
Description : Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent. (A) 15 to 25 (B) 35 to 45 (C) 55 to 75 (D) 75
Last Answer : (B) 35 to 45
Description : Assertion : In presence of ozone, mercury loses its meniscus and sticks to glasses. This is called tailing of mercury Reason: Tailing of mercury is du
Last Answer : Assertion : In presence of ozone, mercury loses its meniscus and sticks to glasses. This is called ... -I is not correct and Statement-II is correct
Description : The material is crushed in a gyratory crusher by the action of (A) Impact (B) Compression (C) Attrition (D) Cutting
Last Answer : (B) Compression
Description : Energy requirement (per unit mass of material crushed/ground) is highest for (A) Jaw crusher (B) Rod mill (C) Ball mill (D) Fluid energy mil
Last Answer : (D) Fluid energy mil
Description : Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripheral velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m3 here, V =πND where, N = speed of the rolls ... V.W.Dr.ρ (B) 3.6 V.W. ρ (C) 3.6 W.Dr.ρ (D) 3.6 V.W.Dr/ρ
Last Answer : (A) 3.6 V.W.Dr.ρ
Description : Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its (A) Easier grindability (B) Poor grindability (C) High power consumption in grinding (D) None of these
Last Answer : (A) Easier grindability
Description : Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the (A) State or manner of application of the crushing force (B) Ultimate strength of the material (C) Elastic constant of the material (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : In the tailing of mercury ozone oxidises X to Y.X and Y are respectively
Last Answer : In the tailing of mercury ozone oxidises X to Y.X and Y are respectively A. Hg,Hg(I)O B. Hg,Hg(II)O C. Hg(I)O,Hg(II)O D. Hg(II)O,Hg(I)O
Description : `{:("List-I","List-II"),("A) O"_(3)+H_(2)O_(2)rarr,"1) Blue"),("B) O"_(3)+"starch KI"rarr,"2) Tailing"),("C) O"_(3)+"Hg"rarr,"3) HIO"_(3)),("D) O"_(3)
Last Answer : `{:("List-I","List-II"),("A) O"_(3)+H_(2)O_(2)rarr,"1) Blue"),("B) O"_(3)+"starch KI"rarr,"2) Tailing"),("C ... 4,3,2):}` D. `{:(A,B,C,D),(3,2,1,5):}`
Description : Which sequence in case of eukaryotes is important for MRNA tailing? (a) GAGAGA (b) GAATTC(c) UACGAC (d) UACUAAC
Last Answer : (d) UACUAAC
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 : Pick out the wrong statement: (A) Magnetic separation method can be employed to treat both dry & wet ores (B) Reduction ratio in crushing operation is defined as the ratio of minimum feed ... ) Gyratory crusher is used for coarse crushing (D) Screens are of stationary, moving and vibratory types
Last Answer : (B) Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size
Description : On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in (A) Greater degree of separation with a fixed number of trays (B) Increased reboiler load
Last Answer : (C) Increased reflux ratio
Description : . For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient, can't be predicted
Last Answer : (A) Increase
Description : The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will (A) Increase (B) Decrease (C) Remain same (D) Depend on saturated boiling point; may increase or decrease
Description : A teacher is introducing a new subject when meeting the class for the first time it would be best to Options: A) Begin with the first lesson without delay B) Give a class a ... of the previous grades D) Concentrate on identifying potential trouble-makers and leaders of the classroom mischief
Last Answer : B) Give a class a broad outline of the subject
Description : What is the selectivity index, if the grade of tailings & concentrate is the same? (A) 0 (B) ∞ (C) 1 (D) 0.5
Last Answer : (C) 1
Description : Vacuum is generally maintained in the vapour space of an evaporator mainly to (A) Get economical temperature difference by using moderate pressure steam (B) Facilitate forward ... (C) Concentrate heat sensitive materials (D) Achieve very high concentration of the final product
Last Answer : (A) Get economical temperature difference by using moderate pressure steam
Description : Black liquor is converted into white liquor by (A) Evaporation and burning the concentrate followed by causticisation of products (B) Multi-effect evaporation only (C) Selective liquid extraction (D) Extractive distillation
Last Answer : (A) Evaporation and burning the concentrate followed by causticisation of products
Description : Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens. (A) Jaw crusher (B) Hammer crusher (C) Ball mill (D) Tube mil
Last Answer : (B) Hammer crusher
Description : . Which of the following relationships between co-efficient of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct? (A) μ > tan α (B) μ ≥ tan α (C) μ > tan 2α (D) μ ≤ tan α
Last Answer : (B) μ ≥ tan α
Description : According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than (A) 0.00184 (B) 0.0184 (C) 0.184 (D) 1.84
Last Answer : (B) 0.0184
Description : Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles) (A) m/ρ . Vp (B) m . ρ/Vp (C) m . Vp /ρ (D) Vp /m . ρ
Last Answer : (A) m/ρ . Vp
Description : Limestone is normally crushed in a (A) Roll crusher (B) Hammer crusher (C) Ball mill (D) Tube mill
Description : The optimum moisture content in solids to be crushed/ground ranges from __________ percent. (A) 3 to 4 (B) 8 to 10 (C) 10 to 15 (D) 15 to 20
Last Answer : (A) 3 to 4
Description : Use of raschig rings in place of crushed stones as packing in packed beds (other things being same) (A) Increases pressure drop, increases surface area (B) Increases pressure drop, decreases ... (C) Decreases pressure drop, increases surface area (D) Decreases pressure drop, decreases surface area
Last Answer : (C) Decreases pressure drop, increases surface area
Description : Channelling is most severe (A) In towers packed with stacked packing (B) In towers packed randomly with crushed solids (C) In dumped packing of regular units
Last Answer : (A) In towers packed with stacked packing
Description : Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the (A) Packing may be crushed due to thermal expansion/contraction of the ... C) Viscosity variation of the fluids may cause channelling/flooding (D) None of these
Last Answer : (A) Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Description : Pick out the wrong statement. (A) Critical moisture content is not a property of the material itself (B) A sharp increase in pressure drop gives an indication of the flooding in a ... unity (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum
Last Answer : (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum
Description : When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation. (A) Continuous (B) Steam (C) Azeotropic (D) None of these
Last Answer : (B) Steam
Description : What is meant by the term radiation resistance for an antenna? A. The resistance in the trap coils to received signal B. An equivalent resistance that would dissipate the same amount of power as ... antenna C. The specific impedance of the antenna D. Losses in the antenna elements and feed line
Last Answer : B. An equivalent resistance that would dissipate the same amount of power as that radiated from an antenna
Description : What are unfermented crushed grapes called?
Last Answer : Grape Juice or "must".Must is freshly pressed fruit juice (usually grape juice) thatcontains the skins, seeds, and stems of the fruit.
Description : Pick up the correct statement from the following: (A) The baked earth is called terra-cotta (B) The articles prepared from clay which is burnt at low temperature and cooled down slowly, are called ... clays which as mixed with stone and crushed pottery, are called stone ware (D) All the above
Last Answer : Answer: Option D
Description : How can you concentrate better?
Last Answer : I just read an article about how ylang ylang essential oil helps with focus. I use a blend that has ylang ylang, frankincense, lime, patchouli, and I’m not sure what else. It works well to focus.
Description : Do you think it's a good idea for a mother of a teenage son to advise the son not to date girls, and just concentrate on school?
Last Answer : answer:This kind of parenting is begging for a teen pregnancy. I mean, I’m all about encouraging the kid to focus on school but ordering them not to date is asking for rebellion.
Description : What do you think about students and adults taking meds created for ADD to help them concentrate when they do not have ADD?
Last Answer : It’s like taking speed.
Description : Can i refrigerate Aloe vera liquid concentrate?
Last Answer : Yes you can refridgerate. I would not freeze.
Description : How can you concentrate while working on a computer & not be distracted by the internet?
Last Answer : Don’t connect to the internets .
Description : Do you find that the internet is changing your ability the ability to concentrate deeply and be reflective?
Last Answer : Interesting topic. While I still read I have noticed that my mind seems to hate a stagnant moment. Any time I am waiting for anything- intermission at the theatre, dr. office etc I am whipping out the IPhone and surfing. If I have 30 seconds I am on email or fluther.
Description : How do you make yourself concentrate more?
Last Answer : I have the other problem – the older I get, the faster I think and react. I seem to spend my life waiting for younger people to finish sentences.
Description : What do you do when you feel so sick you can't really concentrate let alone sleep?
Last Answer : Take some paracetomol, make yourself a hot chocolate and ride it out. A warm pack on your stomach might help. :)
Description : At what point you stopped going to school to concentrate on working full time on your calling?
Last Answer : That point will be after medical school for me…..still working on it. how was it for you?
Description : Why is there a tendency for the sugar mills to concentrate in the southern and western states of India ? Explain any three reasons. -SST 10th
Last Answer : Sugar mills concentrate in the southern and western states because: 1. Sugarcane- The canes of these areas have a higher sucrose content which makes the quality better and less common. 2. ... seasonal industry so it is generally done by cooperatives. Cooperatives in these areas are more successful.
Description : Why is there a tendency for the sugar mills to shift and concentrate in the southern and western states in India ? -SST 10th
Last Answer : Three main reasons are as follows : (i) The cane producced has a higher sucrose centent. (ii) The cooler climate which ensures a longer crushing season. (iii) The cooperatives are more successful in these states.