Pick out the correct statement.(A) Angle of repose is always greater than the angle of slide (B) A hopper is a small bin with a sloping bottom (C) A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal (D) Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process

Pick out the correct statement.
(A) Angle of repose is always greater than the angle of slide
(B) A hopper is a small bin with a sloping bottom
(C) A silo is a short height vessel of very large diameter used for the storage
of high volatile matter coal
(D) Pine oil is used as a 'modifying agent' (for activating or depressing the
adsorption of filming agents) in froth floatation process
by

1 Answer

Answer :

(B) A hopper is a small bin with a sloping bottom
by

Related questions

Pick out the wrong statement. (A) Angle of repose of coal increases with its increasing size (B) Specific gravity of coal increases with its increasing maturity (C) Refractive index and reflectance of coal increases with the increasing rank of coal (D) Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H ratio of coal

Description : Pick out the wrong statement. (A) Angle of repose of coal increases with its increasing size (B) Specific gravity of coal increases with its increasing maturity (C) Refractive index and reflectance of ... of coal decreases with increases in the volatile matter and decrease in the C/H ratio of coal

Last Answer : (D) Specific heat of coal decreases with increases in the volatile matter and decrease in the C/H ratio of coal

Pine oil and Cresylic acid are used as __________ in the froth floatation process. (A) Frother (B) Collector (C) Depressor (D) Conditioner

Description : Pine oil and Cresylic acid are used as __________ in the froth floatation process. (A) Frother (B) Collector (C) Depressor (D) Conditioner

Last Answer : (A) Frother

Pine oil used in froth floatation technique acts as a/an (A) Collector (B) Modifier (C) Frother

Description : Pine oil used in froth floatation technique acts as a/an (A) Collector (B) Modifier (C) Frother

Last Answer : (C) Frother

Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother? (A) Cresylic acid (B) Xanthaies (C) Pine oil (D) All 'a' 'b' & 'c'

Description : Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following ... A) Cresylic acid (B) Xanthaies (C) Pine oil (D) All 'a' 'b' & 'c'

Last Answer : (B) Xanthaies

Pick out the wrong statement. (A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given ‘L/V’ ratio (B) The extraction per unit of total height for a short packed column is more effective than for a tall column, in case of liquid-liquid extraction(C) Natural draft cooling towers are made of ferroconcrete and its cross￾section is wider at the bottom(D) Vander wall adsorption is also called chemisorption

Description : Pick out the wrong statement. (A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given L/V' ratio (B) The extraction per unit ... and its cross￾section is wider at the bottom (D) Vander wall adsorption is also called chemisorption

Last Answer : (D) Vander wall adsorption is also called chemisorption

In froth floatation, chemical agent added to cause air adherence is called (A) Collector (B) Frother (C) Modifier (D) Activato

Description : In froth floatation, chemical agent added to cause air adherence is called (A) Collector (B) Frother (C) Modifier (D) Activato

Last Answer : (A) Collector

Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)? (A) Trough washer (B) Baum jig washer (C) Spiral separator (D) Froth floatation

Description : Which of the following is the most suitable for cleaning of fine coal dust (

Last Answer : (D) Froth floatation

Froth floatation is used for (A) Washing fine coal dust (< 0.5 mm size) (B) Washing lump coal (> 80 mm size) (C) Removing ash from the coal based on difference in specific gravity of coal and ash

Description : Froth floatation is used for (A) Washing fine coal dust (< 0.5 mm size) (B) Washing lump coal (> 80 mm size) (C) Removing ash from the coal based on difference in specific gravity of coal and ash

Last Answer : (A) Washing fine coal dust (< 0.5 mm size)

Pick out the correct statement. (A) If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase (B) A process is irreversible as long as Δ S for the system is greater than zero (C) The mechanical work done by a system is always equal to∫P.dV (D) The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

Description : Pick out the correct statement. (A) If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase (B) A ... compound is defined as the heat of reaction leading to the formation of the compound from its reactants

Last Answer : (D) The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

The olive oil used in froth floatation process is called

Description : The olive oil used in froth floatation process is called

Last Answer : The olive oil used in froth floatation process is called A. Frothing agent B. Lubricating agent C. Conditioning agent D. Both 1 and 2

The oil used in the froth floatation process is?

Description : The oil used in the froth floatation process is?

Last Answer : pine oil

Pick out the wrong statement. (A) High concentration of oxygen in flue gas means high stack loss (B) Gaseous fuels require the least % excess air for complete combustion (C) The ratio of fixed carbon to volatile matter percentage in coal is called its 'fuel ratio' (D) Calorific value of natural gas is more than that of LPG

Description : Pick out the wrong statement. (A) High concentration of oxygen in flue gas means high stack loss (B) Gaseous fuels require the least % excess air for complete combustion (C) The ratio of fixed carbon to ... coal is called its 'fuel ratio' (D) Calorific value of natural gas is more than that of LPG

Last Answer : (D) Calorific value of natural gas is more than that of LPG

Pick out the wrong statement. (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal (B) Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel (C) Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing (D) None of these

Description : Pick out the wrong statement. (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal (B) Low grade coal can be used, but generally high volatile ... and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing (D) None of these

Last Answer : (D) None of these

Rate of low temperature oxidation of coal due to bad storage conditions (A) Decreases with increase in surface area (B) Does not vary with increase in surface area (C) Is more for low volatile coal compared to high volatile coal (D) Is accelerated by storage in large heaps with small surface to volume ratio

Description : Rate of low temperature oxidation of coal due to bad storage conditions (A) Decreases with increase in surface area (B) Does not vary with increase in surface area (C) Is more for low volatile ... to high volatile coal (D) Is accelerated by storage in large heaps with small surface to volume ratio

Last Answer : (D) Is accelerated by storage in large heaps with small surface to volume ratio

Anthracite coal (A) Contains more volatile matter than bituminous coal (B) Ignites more easily than bituminous coal (C) Is essentially a coking coal (D) Burns with short, bluish, yellow-tipped flame producing very little smoke

Description : Anthracite coal (A) Contains more volatile matter than bituminous coal (B) Ignites more easily than bituminous coal (C) Is essentially a coking coal (D) Burns with short, bluish, yellow-tipped flame producing very little smoke

Last Answer : (D) Burns with short, bluish, yellow-tipped flame producing very little smoke

Which of the following statements is correct about the role of substances addedd in the froth floatation process?

Description : Which of the following statements is correct about the role of substances addedd in the froth floatation process?

Last Answer : Which of the following statements is correct about the role of substances addedd in the froth ... D. Froth stablisers decrease wettability of gangue.

Froth floatation process used for the concentration of sulphide ore. Which of the following statements are correct (a) It is based on the difference i

Description : Froth floatation process used for the concentration of sulphide ore. Which of the following statements are correct (a) It is based on the difference i

Last Answer : Froth floatation process used for the concentration of sulphide ore. Which of the following statements are correct (a) ... . (a), (b) ( c) are correct

A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon (A) Is less liable to spontaneous combustion on storage (B) Is more difficult to ignite and produces a shorter flame (C) Requires smaller combustion space and less secondary air (D) None of these

Description : A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon (A) Is less liable to spontaneous combustion on storage (B) ... a shorter flame (C) Requires smaller combustion space and less secondary air (D) None of these

Last Answer : (D) None of these

Xanthates are used in the froth floatation process as a/an (A) Conditioner (B) Frother (C) Collector (D) Activator

Description : Xanthates are used in the froth floatation process as a/an (A) Conditioner (B) Frother (C) Collector (D) Activator

Last Answer : (C) Collector

Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator? (A) Cresylic acid (B) Copper sulphate (C) Calcium carbonate (D) Sodium carbonate

Description : Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator? (A) Cresylic acid (B) Copper sulphate (C) Calcium carbonate (D) Sodium carbonate

Last Answer : (B) Copper sulphate

__________ is an ore concentrating metallurgical process involving a chemical change. (A) Electromagnetic separation (B) Froth floatation (C) Roasting (D) None of these

Description : __________ is an ore concentrating metallurgical process involving a chemical change. (A) Electromagnetic separation (B) Froth floatation (C) Roasting (D) None of these

Last Answer : (C) Roasting

A coal having higher volatile matter content, has lower (A) Smoking tendency on burning (B) Coke oven gas yield on carbonisation (C) Chance of catching fire during storage in open space (D) Ignition temperature

Description : A coal having higher volatile matter content, has lower (A) Smoking tendency on burning (B) Coke oven gas yield on carbonisation (C) Chance of catching fire during storage in open space (D) Ignition temperature

Last Answer : (D) Ignition temperature

When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Description : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Last Answer : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth ... ]` D. They cannot be separated by adding NaCN

When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Description : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Last Answer : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth ... ]` D. They cannot be separated by adding NaCN

Froth floatation process for the concentration of sulphide ore is an illustration of the practical application of

Description : Froth floatation process for the concentration of sulphide ore is an illustration of the practical application of

Last Answer : Froth floatation process for the concentration of sulphide ore is an illustration of the practical ... B. absorption C. sedimentation D. cogulation

In the froth floatation process for the purification of minerals the particles float because

Description : In the froth floatation process for the purification of minerals the particles float because

Last Answer : In the froth floatation process for the purification of minerals the particles float because A. they ... by oil D. They bear an electrostatic charge.

When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Description : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Last Answer : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as ... _(4)]` D. both (1) and (2)

The substance used as froth stablisers in froth floatation process is :

Description : The substance used as froth stablisers in froth floatation process is :

Last Answer : The substance used as froth stablisers in froth floatation process is : A. Fatty acids B. Aniline C. pine oil D. Xanthates

In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by__________

Description : In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by__________

Last Answer : In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by__________ A. ... C. using depressent D. using froth stablisers

Froth floatation process for the concentration of sulphide ore is an illustration of the practical application of

Description : Froth floatation process for the concentration of sulphide ore is an illustration of the practical application of

Last Answer : Froth floatation process for the concentration of sulphide ore is an illustration of the practical ... B. absorption C. sedimentation D. coagulateion

The froth floatation process is used for the concentration of

Description : The froth floatation process is used for the concentration of

Last Answer : The froth floatation process is used for the concentration of A. ore having low density ore ... high density D. ore having water soluble gangue

Which of the following is used as conditioner in froth floatation process

Description : Which of the following is used as conditioner in froth floatation process

Last Answer : Which of the following is used as conditioner in froth floatation process A. Pine oil B. Sodium ethyl xanthate C. Sodium carbonate D. Olive oil

The ore that is concentrated by froth floatation process is

Description : The ore that is concentrated by froth floatation process is

Last Answer : The ore that is concentrated by froth floatation process is A. Chalcopyrites B. Cryolite C. Cuprite D. Calamine

The metallurgical process in which a metal is obtained in a fused state is called - (1) roasting (2) calcinations (3) smelting (4) froth floatation

Description : The metallurgical process in which a metal is obtained in a fused state is called - (1) roasting (2) calcinations (3) smelting (4) froth floatation

Last Answer : (3) smelting Explanation: The metallurgical process in which a metal is obtained in a fused state is called smelting.

What is the role of a stabilizer in froth floatation process?

Description : What is the role of a stabilizer in froth floatation process? 

Last Answer : Ans.: Chemical compounds like cresols and aniline which tend to stabilize the froth are called stabilizers.

What is the role of collector in froth floatation process ?

Description : What is the role of collector in froth floatation process ?

Last Answer : Ans. Collector enhances non-wettability of the mineral particles. 

A coal having high amount of volatile matter (A) Would require smaller combustion chamber (B) Produces very little of tar and gas on carbonisation (C) Ignites easily and burns with long smoky flame (D) All (A), (B) and (C)

Description : A coal having high amount of volatile matter (A) Would require smaller combustion chamber (B) Produces very little of tar and gas on carbonisation (C) Ignites easily and burns with long smoky flame (D) All (A), (B) and (C)

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

A coal having high amount of volatile matter (A) Would require smaller combustion chamber (B) Produces very little of tar and gas on carbonisation(C) Ignites easily and burns with long smoky flame(D) All (A), (B) and (C)

Description : A coal having high amount of volatile matter (A) Would require smaller combustion chamber (B) Produces very little of tar and gas on carbonisation (C) Ignites easily and burns with long smoky flame (D) All (A), (B) and (C)

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

A coal containing high amount of volatile matter will have (A) Low ignition temperature (B) Very little ash content (C) High fusion point of its ash (D) Low adiabatic flame temperature

Description : A coal containing high amount of volatile matter will have (A) Low ignition temperature (B) Very little ash content (C) High fusion point of its ash (D) Low adiabatic flame temperature

Last Answer : (A) Low ignition temperature

Coke compared to the coal from which it has been made, contains (A) Less volatile matter (B) More carbon (C) Greater percentage of ash (D) All (A), (B) and (C)

Description : Coke compared to the coal from which it has been made, contains (A) Less volatile matter (B) More carbon (C) Greater percentage of ash (D) All (A), (B) and (C)

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

Uranium is recovered from its ore (pitchblende) by (A) Froth floatation technique (B) Leaching with sulphuric acid (C) Smelting in a furnace (D) Dissolving in water

Description : Uranium is recovered from its ore (pitchblende) by (A) Froth floatation technique (B) Leaching with sulphuric acid (C) Smelting in a furnace (D) Dissolving in water

Last Answer : (B) Leaching with sulphuric acid

Froth floatation is the most suitable for treating (A) Iron ores (B) Sulphide ores (C) Quartzite (D) None of these

Description : Froth floatation is the most suitable for treating (A) Iron ores (B) Sulphide ores (C) Quartzite (D) None of these

Last Answer : (B) Sulphide ores

Gold ore concentration is mostly done using (A) Jigging (B) Tabling (C) Froth floatation (D) Elutriation

Description : Gold ore concentration is mostly done using (A) Jigging (B) Tabling (C) Froth floatation (D) Elutriation

Last Answer : (B) Tabling

For benefication of iron ore, the most commonly used method is (A) Flocculation (B) Froth floatation (C) Jigging & tabling (D) None of these

Description : For benefication of iron ore, the most commonly used method is (A) Flocculation (B) Froth floatation (C) Jigging & tabling (D) None of these

Last Answer : (C) Jigging & tabling

There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores. (A) Classification (B) Tabling (C) Jigging (D) Froth floatation

Description : There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores. (A) Classification (B) Tabling (C) Jigging (D) Froth floatation

Last Answer : (D) Froth floatation

Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called (A) Classification (B) Froth floatation (C) Thickening (D) Clarification

Description : Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called (A) Classification (B) Froth floatation (C) Thickening (D) Clarification

Last Answer : (A) Classification

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

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

Last Answer : (C) Froth floatation

Iron ore hematite is concentrated using (A) Electromagnetic separation mainly (B) Gravity separation (C) Froth floatation (D) Roasting

Description : Iron ore hematite is concentrated using (A) Electromagnetic separation mainly (B) Gravity separation (C) Froth floatation (D) Roasting

Last Answer : (B) Gravity separation

Ore concentration by froth floatation utilises the __________ of oreparticles. (A) Density difference (B) Wetting characteristics (C) Terminal velocities (D) None of these

Description : Ore concentration by froth floatation utilises the __________ of oreparticles. (A) Density difference (B) Wetting characteristics (C) Terminal velocities (D) None of these

Last Answer : (B) Wetting characteristics