_________ is defined as the geometric mean of the relative rejections
and the relative recoveries of two minerals.
(A) Separation efficiency
(B) Selectivity index
(C) Concentration ratio
(D) None of these

1 Answer

Answer :

(B) Selectivity index

Related questions

Description : The reciprocal of stripping factor is termed as (A) Selectivity index (B) Relative volatility (C) Absorption factor (D) Murphree efficiency

Last Answer : (C) Absorption factor

Description : Separation of two volatile liquids by distillation makes use of their (A) Selectivity (B) Relative volatility (C) Solubility (D) Density difference

Last Answer : (B) Relative volatility

Description : The expression, y(1 - x)/x(1 - y) is for (A) Absorption factor (B) Relative volatility (C) Selectivity (D) Murphree efficiency

Last Answer : (B) Relative volatility

Description : The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called (A) Operational yield (B) Relative yield (C) Selectivity (D) None of these

Last Answer : (C) Selectivity

Description : Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of ... law (D) Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law

Last Answer : (D) Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law

Description : Pick out the correct statement. (A) In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity (B) With increase in temperature, the selectivity of the solvent used ... in solvent extraction is unity at the plait point (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

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 : In liquid extraction, if the selectivity is unity, then (A) Separation of the constituents is the most effective (B) No separation will occur (C) Amount of solvent required will be minimum (D) Solvent flow rate should be very low

Last Answer : (B) No separation will occur

Description : In post offices defalcations or losses, should be charged in the schedule of --------------- and payments and recoveries of losses should be credited in the schedule of --------------- a. UCP, UCR b UCR, UCP, c. receipts , payments

Last Answer : a. UCP,

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 : 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 : Pick out the correct statement. (A) The slope of the stripping line is always less than unity (B) For a given separation in a binary distillation column, with increase in reflux ratio ( ... (D) Kremser-Brown-Souder's equation is used to calculate the efficiency of a plate tower

Last Answer : C) In Ponchon-Savarit method of no. of theoretical plate determination, the stripping and rectifying operating lines are vertical at total reflux

Description : Transplantation of tissues/organs fails often due to non-acceptance by the patient’s body. Which type of immune response is responsible for such rejections? (a) Cell-mediated immune response (b) Hormonal immune response (c) Physiological immune response (d) Autoimmune response

Last Answer : (a) Cell-mediated immune response

Description : Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections ? (1) Cell - mediated immune response (2) Hormonal immune response (3) Physiological immune response (4) Autoimmune response

Last Answer : (1) Cell - mediated immune response

Description : To calculate index number ----- mean is used (a) arithmetic (b) geometric © harmonic (d) none of the above.

Last Answer : (b) geometric

Description : What is the process in which water moves from an area of high concentration to an area of low concentration across a selectivity permeable membrane?

Last Answer : Need answer

Description : A striking feature of living cells is a marked difference between the composition of the cytosol and the extracellular milieu. Which of the following statement(s) concerning the mechanisms of maintenance ... d. The selectivity of cell membranes relates only to ions and not organic compounds

Last Answer : Answer: a The survival of the cell requires that cytosolic composition be maintained within narrow limits, despite the constant influx of nutrients and the simultaneous outflow of waste. A ... be altered drastically as a result of regulatory or signaling processes that occur within the cell

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 : Which of the following minerals is not subjected to magnetic separation method? (A) Rutile (B) Galena (C) Chromite (D) Siderite

Last Answer : (B) Galena

Description : Electrostatic separation of minerals from each other is based on their differences in the following property. (A) Densities (B) Magnetic permeabilities (C) Electrical conductivities (D) Hardness

Last Answer : (C) Electrical conductivities

Description : Pick up the correct definition from the following with response to GIS. (A) Common boundary between two areas of a locality is known as adjacency (B) The area features which are wholly ... property which describes the linkage between line features is defined as connectivity (D) All of these

Last Answer : Answer: Option D

Description : Pick out the wrong statement. (A) Longer tubes are less expensive per unit heat transfer area as compared to shorter tubes (B) A cost index is merely a number for a given year ... butt welded joints are less expensive compared to lap welded joints, because squaring of plates is not necessary

Last Answer : (D) Plates with butt welded joints are less expensive compared to lap welded joints, because squaring of plates is not necessary

Description : The slope of 9-line is determined by the (A) Reflux ratio (B) Plate efficiency to be achieved (C) Thermal condition of the feed (D) Relative volatility

Last Answer : (C) Thermal condition of the feed

Description : The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same. (A) Kinematic viscosity (B) Work (C) Temperature (D) None of these

Last Answer : (D) None of these

Description : Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer ... (C) Temperature of the fin end (D) Constant temperature equal to that of the base

Last Answer : (D) Constant temperature equal to that of the base

Description : The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the (A) Bacterial stability factor (B) Relative stability (C) Biological oxygen demand (BOD) (D) Oxygen ion concentration

Last Answer : (B) Relative stability

Description : Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their (A) Viscosity (B) Density (C) Solubility (D) Relative volatility

Last Answer : (C) Solubility

Description : The-relative volatility for separation of a non-ideal binary mixture by distillation should be (A) 0 (B) 1 (C) > 1 (D) < 1

Last Answer : (C) > 1

Description : In a binary system, separation is very efficient, when the relative volatility is (A) 1 (B) > 1 (C) < 1 (D) 0.5

Last Answer : (B) > 1

Description : The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called a. net efficiency b. efficiency ratio c. relative efficiency d. overall efficiency

Last Answer : ANSWER c. relative efficiency

Description : Water separometer index (modified) (WSIM) of a petrofuel is the measure of its (A) Emulsification tendency (B) Water separation characteristics (C) Water content (D) Water absorbing capacity from atmosphere

Last Answer : (B) Water separation characteristics

Description : Steam distillation is used to (A) Reduce the number of plates (B) Avoid thermal decomposition of a component (C) Increase the efficiency of separation (D) Increase the total pressure of distillation

Last Answer : (B) Avoid thermal decomposition of a component

Description : The liquidity index is defined as a ratio expressed as percentage of (A) Plastic limit minus the natural water content, to its plasticity index (B) Natural water content minus its plastic limit ... to its plasticity index (D) Liquid limit minus the natural water content to the plasticity index

Last Answer : (B) Natural water content minus its plastic limit to its plasticity index

Description : Toughness index is defined as the ratio of (A) Plasticity index to consistency index (B) Plasticity index to flow index (C) Liquidity index to flow index (D) Consistency index to liquidity index

Last Answer : (B) Plasticity index to flow index

Description : The consistency index of a soil is defined as the ratio of (A) Liquid limit plus the natural water content to the plasticity index of the soil (B) Liquid limit minus the natural water content to ... (D) Natural water content of a soil plus its plastic limit to the plasticity index of the soil

Last Answer : Answer: Option B

Description : What is defined as the ratio of the net electrical power output to the rate of fuel energy input?  A. Combustion efficiency  B. Thermal efficiency  C. Overall efficiency  D. Furnace efficiency

Last Answer : Overall efficiency

Description : The index of efficiency and profitability of the business a) Operating ratio b) Operating profit ratio c) Expense ratio d) Net profit ratio

Last Answer : b) Operating profit ratio

Description : Stacking antenna elements A. increases sensitivity to weak signals B. will suppress odd harmonics C. decrease signal to noise ratio D. increases selectivity

Last Answer : A. increases sensitivity to weak signals

Description : What causes image interference? A. Low gain B. High IF C. Poor front-end selectivity D. Low signal-to-noise ratio

Last Answer : C. Poor front-end selectivity

Description : According to Malthusian theory of population - (1) Population increases in geometric ratio, food supply increases in arithmetic ratio (2) Population increases in arithmetic ratio, food supply increases in ... (4) Population increases in a harmonic ratio, food supply increases in a arithmetic ratio

Last Answer : (1) Population increases in geometric ratio, food supply increases in arithmetic ratio Explanation: In his 1798 work, An Essay on the Principle of Population, Malthus ermined the relationship between population ... e. by the repeated addition of a uniform increment in each uniform interval of time).

Description : According to Malthusian theory of population (1) Population increases in geometric ratio, food supply increases in arithmetic ratio (2) Population increases in arithmetic ratio, food supply increases in ... (4) Population increases in a harmonic ratio, food supply increases in a arithmetic ratio 

Last Answer : Population increases in geometric ratio, food supply increases in arithmetic ratio

Description : Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called (A) Classification (B) Sedimentation (C) Clarification (D) Decantation

Last Answer : (B) Sedimentation

Description : Ultracentrifuges running at speeds upto 100000 rpm is normally used for the (A) Separation of isotopes based on their density or molecular weights difference (B) Concentration of rubber latex (C) Separation of cream from milk (D) Dewaxing of lubricating oil

Last Answer : (A) Separation of isotopes based on their density or molecular weights difference (B) Conc

Description : Concentration of sulphide ores is done usually by (A) Roasting (B) Smelting (C) Froth floatation (D) Electromagnetic separation

Last Answer : (C) Froth floatation

Description : In an elastic collision, the RELATIVE velocities of separation of the two bodies after impact compared with the relative velocity of approach before impact is: w) always greater x) always smaller y) always the same z) first greater, then smaller

Last Answer : ANSWER: Y -- ALWAYS THE SAME

Description : In a perfectly elastic collision, the relative speed of approach and relative speed of separation are A. equal B. in equal C. zero D. infinite

Last Answer : equal

Description : In a chromatographic separation, which of the following is most appropriate for the qualitative identification of a substance? A. Relative retention factor B. Retention factor C. Retention time D. Resolution 

Last Answer : Retention time

Description : What is the 12th term in a geometric sequence that has a first term of 6 and a common ratio of 3?

Last Answer : It is 1062882.

Description : What is the common ratio in this geometric sequence 7?

Last Answer : A single number does not constitute a sequence.

Description : Which one among the following is not a characteristic of a federal system? (1) There are two distinct levels of government (2) The responsibilities and powers of each level of ... Court is entrusted with the responsibility of interpreting these provisions and arbitrating in matters of dispute

Last Answer : (3) There is no separation of powers between the legislative and executive branches of government Explanation: One of the features of the federal system is the distribution of power ... importance. Both federal and state governments functioning strictly within the sphere demarcated for them.