The most common packing used in industrial operations is __________ rings. (A) Raschig (B) Lessing (C) Cross-partition (D) Single spiral

The most common packing used in industrial operations is __________
rings.
(A) Raschig
(B) Lessing
(C) Cross-partition
(D) Single spiral
by

1 Answer

Answer :

(C) Cross-partition
by

Related questions

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 surface area (C) Decreases pressure drop, increases surface area (D) Decreases pressure drop, decreases surface area

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

Which of the following ceramic packing materials is the costliest of all? (A) Berl saddles (B) Raschig rings (C) Pall rings (D) Intalox saddles

Description : Which of the following ceramic packing materials is the costliest of all? (A) Berl saddles (B) Raschig rings (C) Pall rings (D) Intalox saddles

Last Answer : Berl saddles

Diameter of raschig rings used in packed tower in industry is normally around __________ inches. (A) 2 (B) 8 (C) 12 (D) 18

Description : Diameter of raschig rings used in packed tower in industry is normally around __________ inches. (A) 2 (B) 8 (C) 12 (D) 18

Last Answer : (A) 2

For raschig rings, the sphericity is (A) 0.5 (B) 1 (C) < 1

Description : For raschig rings, the sphericity is (A) 0.5 (B) 1 (C) < 1

Last Answer : (C) < 1

Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity? (A) Sphere(B) Cube(C) Cylinder (L/D = 1)(D) Raschig rings

Description : Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity? (A) Sphere (B) Cube (C) Cylinder (L/D = 1) (D) Raschig rings

Last Answer : (A) Sphere

Pick out the correct statement. (A) Fanning friction factor is inversely proportional to Reynolds number always (B) The property of a randomly packed bed (with raschig rings) is given by the ratio of the total volume to the volume of voids in the bed (C) Mach number in an incompressible fluid is always unity (D) Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

Description : Pick out the correct statement. (A) Fanning friction factor is inversely proportional to Reynolds number always (B) The property of a randomly packed bed (with raschig rings) is given by the ratio of the ... the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

Last Answer : (D) Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

What is the heat escape Lessing posture designed to prevent?

Description : What is the heat escape Lessing posture designed to prevent?

Last Answer : Need answer

Sphericity of raschig ring (whose length and diameter are equal) is (A) > 1 (B) < 1 (C) 1 (D) 2

Description : Sphericity of raschig ring (whose length and diameter are equal) is (A) > 1 (B) < 1 (C) 1 (D) 2

Last Answer : (C) 1

Diameter to height ratio for a raschig ring is (A) 1 (B) 0.5 (C) 2 (D) 8

Description : Diameter to height ratio for a raschig ring is (A) 1 (B) 0.5 (C) 2 (D) 8

Last Answer : (A) 1

Raschig ring made of porcelain cannot be used for treating concentrated (A) Hydrochloric acid (B) Nitric acid (C) Alkalis (D) Sulphuric acid

Description : Raschig ring made of porcelain cannot be used for treating concentrated (A) Hydrochloric acid (B) Nitric acid (C) Alkalis (D) Sulphuric acid

Last Answer : (C) Alkalis

An ideal tower packing should not (A) Have low weight per unit volume (B) Have large surface area per unit volume (C) Have large free cross-section (D) Hold up large amount of liquid in the packing

Description : An ideal tower packing should not (A) Have low weight per unit volume (B) Have large surface area per unit volume (C) Have large free cross-section (D) Hold up large amount of liquid in the packing

Last Answer : (D) Hold up large amount of liquid in the packing

Which of the following is an undesirable property in a tower packing? (A) Large surface per unit volume (B) Large free cross-section (C) Low weight per unit volume (D) Large weight of liquid retained

Description : Which of the following is an undesirable property in a tower packing? (A) Large surface per unit volume (B) Large free cross-section (C) Low weight per unit volume (D) Large weight of liquid retained

Last Answer : (D) Large weight of liquid retained

In industrial operations fluids with temperature less than __________ are set as the limit for waste heat recovery because of the risk of condensation of corrosive liquids a. 80C b. 100C c. 120C d. 200C

Description : In industrial operations fluids with temperature less than __________ are set as the limit for waste heat recovery because of the risk of condensation of corrosive liquids a. 80C b. 100C c. 120C d. 200C

Last Answer : 100C

Pick up the correct statement regarding the centre line method of estimating a building (A) Product of the centre line of the walls and area of cross-section of any item, gives total quantity of the item (B) The centre line is worked out separately for different sections of walls of a building (C) The centre line length is reduced by half the layer of main wall joining the partition wall (D) All the above

Description : Pick up the correct statement regarding the centre line method of estimating a building (A) Product of the centre line of the walls and area of cross-section of any item, gives total quantity of the ... length is reduced by half the layer of main wall joining the partition wall (D) All the above

Last Answer : (D) All the above

Most important factor to be considered in the selection of packings for absorbers is the __________ of packing. (A) Size (B) Durability (C) Porosity (D) Cost

Description : Most important factor to be considered in the selection of packings for absorbers is the __________ of packing. (A) Size (B) Durability (C) Porosity (D) Cost

Last Answer : (C) Porosity

In an absorption column, the flooding velocity for random packing is __________ that for stacked/regular packing. (A) Greater than (B) Smaller than (C) Equal to (D) Either (A), or (B); depends on the type of packing

Description : In an absorption column, the flooding velocity for random packing is __________ that for stacked/regular packing. (A) Greater than (B) Smaller than (C) Equal to (D) Either (A), or (B); depends on the type of packing

Last Answer : (B) Smaller than

The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void. (A) Equal to (B) Greater than (C) Less than (D) Either (A), (B) or (C); depends on the size of atom

Description : The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void. (A) Equal to (B) Greater than (C) Less than (D) Either (A), (B) or (C); depends on the size of atom

Last Answer : (C) Less than

Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure. (A) Hexagonal close, packed (hcp) (B) Face centred cubic (fcc) (C) Body centred cubic (bcc) (D) Simple cubic

Description : Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure. (A) Hexagonal close, packed (hcp) (B) Face centred cubic (fcc) (C) Body centred cubic (bcc) (D) Simple cubic

Last Answer : (D) Simple cubic

Closeness of packing is maximum in case of __________ crystal lattice. (A) Face centred (B) Simple cubic (C) Body centred (D) None of these

Description : Closeness of packing is maximum in case of __________ crystal lattice. (A) Face centred (B) Simple cubic (C) Body centred (D) None of these

Last Answer : (A) Face centred

There are one octahedral void and __________ tetrahedral void in the closest packing of atoms. (A) One (B) Two (C) Three (D) None of these

Description : There are one octahedral void and __________ tetrahedral void in the closest packing of atoms. (A) One (B) Two (C) Three (D) None of these

Last Answer : Option B

Lowest level of staff/supervisor competent for packing or renewal of single isolated sleeper not requiring lifting or slewing of track in LWR/CWR. a. PWI b. Keyman c. Gangmate* d. PWS

Description : Lowest level of staff/supervisor competent for packing or renewal of single isolated sleeper not requiring lifting or slewing of track in LWR/CWR. a. PWI b. Keyman c. Gangmate* d. PWS

Last Answer : c. Gangmate*

Having multiple perceptrons can actually solve the XOR problem satisfactorily: this is because each perceptron can partition off a linear part of the space itself, and they can then combine their results. a) True – this works always, and these multiple perceptrons learn to classify even complex problems. b) False – perceptrons are mathematically incapable of solving linearly inseparable functions, no matter what you do c) True – perceptrons can do this but are unable to learn to do it – they have to be explicitly hand-coded d) False – just having a single perceptron is enough

Description : Having multiple perceptrons can actually solve the XOR problem satisfactorily: this is because each perceptron can partition off a linear part of the space itself, and they can then combine their results. ... have to be explicitly hand-coded d) False - just having a single perceptron is enough

Last Answer : c) True – perceptrons can do this but are unable to learn to do it – they have to be explicitly hand-coded

Draw graphical symbols as per IS 962 – 1989. (i) Brickwork (ii) Partition Block (iii) Wood (iv) Single shutter door

Description : Draw graphical symbols as per IS 962 – 1989. (i) Brickwork (ii) Partition Block (iii) Wood (iv) Single shutter door

Last Answer : Graphical Symbols as per IS 962 – 1989, for-

(1) they contain free electrons Explanation: Metals typically consist of closepacked atoms, meaning that the atoms are arranged like closely packed spheres. Two packing motifs are common, one being bodycentered cubic wherein each metal atom is surrounded by eight equivalent atoms. The other main motif is face-centered cubic where the metal atoms are surrounded by six neighboring atoms. Several metals adopt both structures, depending on the temperature.

Description : (1) they contain free electrons Explanation: Metals typically consist of closepacked atoms, meaning that the atoms are arranged like closely packed spheres. Two packing motifs are common, one ... surrounded by six neighboring atoms. Several metals adopt both structures, depending on the temperature.

Last Answer : Helium gas is filled in ballons because (1) its atomic number is 2 (2) it is lighter than air (3) it is one of the constitutents of water (4) it is a noble gas

What are the common types of partition chromatography?

Description : What are the common types of partition chromatography?

Last Answer : Paper chromatography and thin layer chromatography.

Nogging of a common wooden partition is (A) Upper horizontal wooden member (B) Lower horizontal wooden member (C) Intermediate horizontal wooden member (D) Vertical wooden member

Description : Nogging of a common wooden partition is (A) Upper horizontal wooden member (B) Lower horizontal wooden member (C) Intermediate horizontal wooden member (D) Vertical wooden member

Last Answer : Answer: Option C

Stud(s) of a common wooden partition (A) Are vertical wooden members (B) Is the upper horizontal wooden member (C) Is the lower horizontal wooden member (D) Are the intermediate horizontal wooden members

Description : Stud(s) of a common wooden partition (A) Are vertical wooden members (B) Is the upper horizontal wooden member (C) Is the lower horizontal wooden member (D) Are the intermediate horizontal wooden members

Last Answer : Answer: Option A

The sill of a common wooden partition is (A) Vertical wooden member on either end (B) Lower horizontal wooden member (C) Upper horizontal wooden member (D) Intermediate horizontal wooden member

Description : The sill of a common wooden partition is (A) Vertical wooden member on either end (B) Lower horizontal wooden member (C) Upper horizontal wooden member (D) Intermediate horizontal wooden member

Last Answer : Answer: Option B

The cross-section of a stem of tree has fifty rings, what is the age of the tree? (1) 50 months (2) 5 years (3) 25 years (4) 50 years

Description : The cross-section of a stem of tree has fifty rings, what is the age of the tree? (1) 50 months (2) 5 years (3) 25 years (4) 50 years

Last Answer : (4) 50 years Explanation: Dendrochronology or tree-ring dating is the scientific method of dating based on the analysis of patterns of tree rings, also known as growth rings. Dendrochronology can date ... the vascular cambium, a layer of cells near the bark that is classified as a lateral meristem.

The cross-section of a stem of tree has fifty rings, what is the age of the tree ? (1) 50 months (2) 5 years (3) 25 years (4) 50 years

Description : The cross-section of a stem of tree has fifty rings, what is the age of the tree ? (1) 50 months (2) 5 years (3) 25 years (4) 50 years

Last Answer :  50 years

4. This Innovative science of Operations Research was discovered during ________ a. Civil War b. World War I c. World War II d. Industrial Revolution

Description : 4. This Innovative science of Operations Research was discovered during ________ a. Civil War b. World War I c. World War II d. Industrial Revolution

Last Answer : c. World War II

_____ are industrial pro ial products t ducts that aid in t hat aid in the buyer he buyer’s produc ’s production or o tion or operations, in ions, including installations and accessory equipment. a. Materials b. Parts c. Capital items d. Specialty products

Description : _____ are industrial pro ial products t ducts that aid in t hat aid in the buyer he buyer’s produc ’s production or o tion or operations, in ions, including installations and accessory equipment. a. Materials b. Parts c. Capital items d. Specialty products

Last Answer : c. Capital items

The thre The three groups o e groups of indust f industrial pr rial products a oducts and servi nd services inc ces include all of t lude all of the foll he following exc owing except _____. a. materials and parts b. capital items capital items c. maintenance and operations d. supplies and services

Description : The thre The three groups o e groups of indust f industrial pr rial products a oducts and servi nd services inc ces include all of t lude all of the foll he following exc owing except _____. a. materials and parts b. capital items capital items c. maintenance and operations d. supplies and services

Last Answer : c. maintenance and operations

The innovative science of Operations Research was discovered during ...................... a. Civil war b. World war I c. World war II d. Industrial Revolution

Description : The innovative science of Operations Research was discovered during ...................... a. Civil war b. World war I c. World war II d. Industrial Revolution

Last Answer : c. World war II

The field of operations management is shaped by advances in which of the following fields? (a) chemistry and physics ; (b) industrial engineering and management science (c) information sciences ; (d) all of the above

Description : The field of operations management is shaped by advances in which of the following fields? (a) chemistry and physics ; (b) industrial engineering and management science (c) information sciences ; (d) all of the above 

Last Answer : (d) all of the above

__________ rubber is generally used for making 'O' rings used for vacuum sealings. (A) Natural (B) Neoprene (C) Butadiene (D) Nitrile

Description : __________ rubber is generally used for making 'O' rings used for vacuum sealings. (A) Natural (B) Neoprene (C) Butadiene (D) Nitrile

Last Answer : (B) Neoprene

Branched chain polymers compared to linear polymers have higher (A) Density (B) Tensile strength (C) Melting point (D) Degree of irregularity in atomic packing

Description : Branched chain polymers compared to linear polymers have higher (A) Density (B) Tensile strength (C) Melting point (D) Degree of irregularity in atomic packing

Last Answer : (D) Degree of irregularity in atomic packing

Thermocol (expanded polystyrene) is not used for (A) Low temperature thermal insulation as in refrigerator and air conditioners (B) Acoustic control and ceiling for building (C) High temperature thermal insulation in furnaces (D) Packing of delicate electronic gadgets

Description : Thermocol (expanded polystyrene) is not used for (A) Low temperature thermal insulation as in refrigerator and air conditioners (B) Acoustic control and ceiling for building (C) High temperature thermal insulation in furnaces (D) Packing of delicate electronic gadgets

Last Answer : (C) High temperature thermal insulation in furnaces

Tin in its pure form is used for making (A) Cans for food packing (B) Collapsible tubes for toilet preparations (C) Foil for wrapping cheese (D) All (A), (B) and (C)

Description : Tin in its pure form is used for making (A) Cans for food packing (B) Collapsible tubes for toilet preparations (C) Foil for wrapping cheese (D) All (A), (B) and (C)

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

In SO3 absorber (Contact Process), packing material used is of (A) Cast iron (B) Chemical stoneware (C) Karbate (D) Mild steel

Description : In SO3 absorber (Contact Process), packing material used is of (A) Cast iron (B) Chemical stoneware (C) Karbate (D) Mild steel

Last Answer : (B) Chemical stoneware

In an absorber, HETP does not vary with the (A) Flow rate of liquid (B) Flow rate of gas (C) Type and size of packing (D) None of these

Description : In an absorber, HETP does not vary with the (A) Flow rate of liquid (B) Flow rate of gas (C) Type and size of packing (D) None of these

Last Answer : (D) None of these

Channelling in a packed tower results from the (A) High pressure drop (B) Maldistribution of liquid (C) Non-uniformity of packing (D) Both (B) and (C)

Description : Channelling in a packed tower results from the (A) High pressure drop (B) Maldistribution of liquid (C) Non-uniformity of packing (D) Both (B) and (C)

Last Answer : (D) Both (B) and (C)

Which of these columns incurs the lowest pressure drop? (A) Packed column (with stacked packing) (B) Packed column (with dumped packing) (C) Bubble plate column (D) Pulse column

Description : Which of these columns incurs the lowest pressure drop? (A) Packed column (with stacked packing) (B) Packed column (with dumped packing) (C) Bubble plate column (D) Pulse column

Last Answer : (A) Packed column (with stacked packing)

Stacked packing compared to dumped packing (A) Provides poorer contact between the fluids (B) Gives lower pressure drop (C) Both (A) and (B) (D) Gives higher pressure drop

Description : Stacked packing compared to dumped packing (A) Provides poorer contact between the fluids (B) Gives lower pressure drop (C) Both (A) and (B) (D) Gives higher pressure drop

Last Answer : (C) Both (A) and (B)

In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter (A) > 4 :1 (B) < 8 : 1 (C) > 8:1 (D) < 6:1

Description : In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter (A) > 4 :1 (B) < 8 : 1 (C) > 8:1 (D) < 6:1

Last Answer : (C) > 8:1

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

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

Pick out the wrong statement. (A) Packed towers are preferred for vacuum operation, because the pressure drop through the packing is less and they (packings) also lessen the possibility of tower wall collapse (B) Packed towers are preferred over plate towers for handling corrosive and foamy liquids (C) Diameter of randomly packed tower is normally more than 1.2 metres (D) Due to uneven supply and improper distribution of liquid, problem of channelling, loading & flooding is generally encountered in packed towers

Description : Pick out the wrong statement. (A) Packed towers are preferred for vacuum operation, because the pressure drop through the packing is less and they (packings) also lessen the ... of liquid, problem of channelling, loading & flooding is generally encountered in packed towers

Last Answer : (C) Diameter of randomly packed tower is normally more than 1.2 metres

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 components of the equipments (B) Pressure drop in the equipment will be very high (C) Viscosity variation of the fluids may cause channelling/flooding (D) None of these

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

Pressure drop through plate tower as compared to that through packed tower, for the same duty will be (A) Less (B) More (C) Equal (D) Either (A) or (B); depends on the packing height

Description : Pressure drop through plate tower as compared to that through packed tower, for the same duty will be (A) Less (B) More (C) Equal (D) Either (A) or (B); depends on the packing height

Last Answer : (B) More

What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillery, dairy and meat packing industries? (A) Radioactive substances (B) Natural organic products (C) Inorganic pollutants (D) None of these

Description : What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillery, dairy and meat packing industries? (A) Radioactive substances (B) Natural organic products (C) Inorganic pollutants (D) None of these

Last Answer : (B) Natural organic products