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Corrosion resistance of steel is increased by the addition of

CHEMICAL ENGINEERING, Materials and Construction /
Question: Corrosion resistance of steel is increased by the addition of
[A].

phosphorous and tungsten.

[B].

nickel and chromium.

[C].

lead and vanadium.

[D].

molybdenum and tungsten.

Answer: Option B

Explanation:

No answer description available for this question.

Corrosion resistance of steel is increased by the addition of Read More »

CHEMICAL ENGINEERING, Materials and Construction

Absorption factor method is used to calculate the number of ideal stages, when

CHEMICAL ENGINEERING, Mass Transfer /
Question: Absorption factor method is used to calculate the number of ideal stages, when
[A].

operating line lies above the equilibrium line.

[B].

operating line lies below the equilibrium line.

[C].

both operating and equilibrium lines are parallel.

[D].

pressure drop in the column is very high.

Answer: Option C

Explanation:

No answer description available for this question.

Absorption factor method is used to calculate the number of ideal stages, when Read More »

CHEMICAL ENGINEERING, Mass Transfer

Bog iron used for the adsorption of H2S from coke oven gas is

CHEMICAL ENGINEERING, Materials and Construction /
Question: Bog iron used for the adsorption of H2S from coke oven gas is
[A].

an intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide).

[B].

iron impregnated with resin (usually bakelite).

[C].

carbon free iron.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Bog iron used for the adsorption of H2S from coke oven gas is Read More »

CHEMICAL ENGINEERING, Materials and Construction

At equilibrium the concentration of water in vapour phase (C*)in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is

CHEMICAL ENGINEERING, Mass Transfer /
Question: At equilibrium the concentration of water in vapour phase (C*)in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is
[A].

0.0

[B].

0.2

[C].

0.4

[D].

1.0

Answer: Option C

Explanation:

No answer description available for this question.

At equilibrium the concentration of water in vapour phase (C*)in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is Read More »

CHEMICAL ENGINEERING, Mass Transfer

A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

CHEMICAL ENGINEERING, Mass Transfer /
Question: A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is
[A].

1000

[B].

1500

[C].

2000

[D].

2500

Answer: Option A

Explanation:

No answer description available for this question.

A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is Read More »

CHEMICAL ENGINEERING, Mass Transfer

An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)

CHEMICAL ENGINEERING, Mass Transfer /
Question: An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)
[A].

less number of trays are required.

[B].

composition of the residue remains unchanged.

[C].

more number of trays are required but the residue composition remains unchanged.

[D].

more number of trays are required and the residue composition is more dilute in methanol.

Answer: Option A

Explanation:

No answer description available for this question.

An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii) Read More »

CHEMICAL ENGINEERING, Mass Transfer