To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between (A) 1100° and 1200°C (B) 1200° and 1300°C (C) 1300° and 1400°C (D) 1400° and 1500°C

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a
temperature between
(A) 1100° and 1200°C
(B) 1200° and 1300°C
(C) 1300° and 1400°C
(D) 1400° and 1500°C
by

1 Answer

Answer :

D
by

Related questions

The mixture of different ingredients of cement, is burnt at (A) 1000°C (B) 1200°C (C) 1400°C (D) 1600°C

Description : The mixture of different ingredients of cement, is burnt at (A) 1000°C (B) 1200°C (C) 1400°C (D) 1600°C

Last Answer : (C) 1400°C

In the manufacture of cement, the dry of wet mixtue of calcareous and argillaceous materials is burnt in a (a) A Rotary kiln (b) A Grinder (c) Country kiln (d) All the above

Description : In the manufacture of cement, the dry of wet mixtue of calcareous and argillaceous materials is burnt in a (a) A Rotary kiln (b) A Grinder (c) Country kiln (d) All the above

Last Answer : (a) A Rotary kiln

The temperature produced on the power stroke of an engine can be as high as a) 1200°C b) 1400°C c) 1600°C d) 1800°C

Description : The temperature produced on the power stroke of an engine can be as high as a) 1200°C b) 1400°C c) 1600°C d) 1800°C

Last Answer : c) 1600°C

Rotary kiln is not involved in the production of (A) Cement (B) Lime from limestone (C) Slaked lime from quick lime (D) None of these

Description : Rotary kiln is not involved in the production of (A) Cement (B) Lime from limestone (C) Slaked lime from quick lime (D) None of these

Last Answer : (C) Slaked lime from quick lime

Calcareous and argillaceous materials used in manufacture of cement consists of (a) Lime stone (b) Chalk (c) Shales (d) All the above

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Last Answer : (d) All the above

How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln? (A) 500°C (B) 750°C (C) 1000°C (D) 1500°C

Description : How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln? (A) 500°C (B) 750°C (C) 1000°C (D) 1500°C

Last Answer : (C) 1000°C

The stone masonry of finely dressed stones laid in cement or lime, is (A) Random rubble masonry (B) Coursed rubble masonry (C) Dry rubble masonry (D) Ashlar masonry

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Last Answer : Answer: Option D

The stone ware sewers A. Are used for carrying sewage and drainage from houses B. Are manufactured from clays and shale C. After casting are dried and burnt at temperature 150°C, 700°C and 1200°C D. All the above

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Calcination of limestone to produce lime is done in a __________ kiln. (A) Tunnel (B) Rotary (C) Vertical shaft (D) Both (B) and (C)

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

Calcination of limestone is not done in a __________ kiln for producing lime. (A) Vertical shaft (B) Rotary (C) Fluidised bed (D) Fixed bed

Description : Calcination of limestone is not done in a __________ kiln for producing lime. (A) Vertical shaft (B) Rotary (C) Fluidised bed (D) Fixed bed

Last Answer : (D) Fixed bed

Rotary lime kiln is an example of a/an __________ system. (A) Closed (B) Open (C) Isolated (D) Non-thermodynamic

Description : Rotary lime kiln is an example of a/an __________ system. (A) Closed (B) Open (C) Isolated (D) Non-thermodynamic

Last Answer : (B) Open

Cement Kiln is a (A) Rotary Kiln (B) Tunnel Kiln (C) Natural draft furnace (D) Batch furnace

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Last Answer : (A) Rotary Kiln

A yellow metallic powder is burnt in a stream of fluorine to obtain a colourless gas X which is thermally stable and chemically inert. Its molecule ha

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Which of the following situations can be approximated to a steady state heat transfer system? (A) A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmospheric air at 35°C (B) 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C (C) Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C (D) A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C

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Last Answer : (B) 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C

Calcination reaction of limestone (CaCO3 → CaO + CO2 ) goes to completion in the rotary kiln, because (A) CaO is not dissociated (B) CO2 escapes continuously (C) Of high calcination temperature (D) CaO is more stable than CaCO3

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__________ is used for producing a thick suspension from a thin slurry. (A) Cartridge filter (B) Rotary drum vacuum filter (C) Pressure filter thickener (D) Plate and frame filter press

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Last Answer : (C) Pressure filter thickener

Percentage of drum submerged in the slurry in case of rotary drum filter is (A) 3 (B) 30 (C) 85 (D) 25

Description : Percentage of drum submerged in the slurry in case of rotary drum filter is (A) 3 (B) 30 (C) 85 (D) 25

Last Answer : (B) 30

Filtration capacity of a rotary drum vacuum filter depends upon the (A) Cake thickness (B) Characteristics of the feed slurry (C) Both (A) & (B) (D) Neither (A) nor (B)

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

A slurry is to be dried to produce flaky solid. Which dryer would you recommend? (A) Spray dryer (B) Drum dryer (C) Rotary dryer (D) Dielectric drye

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Large tonnage of refractory bricks are dried in a (A) Shaft furnace (B) Rotary hearth furnace (C) Tunnel kiln (D) Muffle furnace

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Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent. (A) 20 (B) 40 (C) 65 (D) 80

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Which of the following is a heat treatment furnace? (A) Muffle furnace (B) Annealing furnace (C) Reheating furnace (D) Rotary kiln

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Which of the following is a periodic furnace? (A) Tunnel kiln (B) Rotary kiln (C) Soaking pit (D) Reheating furnace

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Coal tar is used as a (A) Binding material for coal briquettes (B) Fuel in rotary kiln (C) Binder in making carbon electrodes (D) All (A), (B) and (C)

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Refractory bricks having high thermal conductivity is desirable, when it is to be used in the (A) L.D. converter (B) Blast furnace (C) Rotary kiln (D) Recuperator

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Last Answer : (D) Recuperator

What is the combustion temperature range in cement kiln incineration? a) 1300-1600 b) 1350-1650 c) 1250-1450 d) 1235-1600

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Shales are (A) Porous (B) Permeable (C) Porous and permeable (D) Porous but not permeable

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Define lime and explain manufacturing of lime by continuous kiln with neat sketch.

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Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percentfurnace oil as compared to its combustion with atmospheric air, if the fluegas outlet temperature from the soaking pit is 1200°C.(A) 5(B) 60(C) 20(D) 40

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Concrete containing (A) Siliceous aggregates, has higher co-efficient of expansion (B) Igneous aggregates, has intermediate coefficient of expansion (C) Lime stones, has lowest co-efficient of expansion (D) All the above

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Lime stones are generally known as (A) Aqueous rocks (B) Sedimentary rocks (C) Stratified rocks (D) All the above

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Concrete contains (i)Siliceous aggregates, having higher coefficient of expansion (ii)Igneous aggregates, having intermediate coefficient of expansion (iii)Lime stones, having lowest coefficient of expansion [ A ] i and iii [ B ] ii and iii [ C ] i and ii [ D ] i, ii and iii

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During combustion of coal on grate, clinker formation is increased by the (A) Use of thick fire bed (B) Low fusion point of ash (< 1100° C) (C) Use of preheated primary air (D) All (A), (B) & (C)

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The temperature of oxyacetylene flame is around – (1) 2800°C (2) 3200°C (3) 4000°C (4) 1500°C

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The high strength of rapid hardening cement at early stage, is due to its (A) Finer grinding (B) Burning at high temperature (C) Increased lime cement (D) Higher content of tricalcium

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A thick paste of cement, sand and water is called – (1) Concrete (2) R.C.C. (3) Mortar (4) Kiln

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The preparation of surface of stone to obtain plain edges or to obtain stones of required size and shape is known as (A) Quarrying of stones (B) Blasting of stones (C) Seasoning of stones (D) Dressing of stones

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Green coal, in order to be burnt, must be (A) Heated sufficiently (B) Burnt in excess air (C) Heated to its ignition point (D) Burnt as powder

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For controlling algae, the most commonly used chemical, is (A) Copper sulphate (B) Alum (C) Lime (D) Bleaching powder

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To control the growth of algae in reservoirs, the compound which is used, is (A) Bleaching powder (B) Copper sulphate (C) Lime solution(D) Alum solution

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When the ore haematite is burnt in air with coke around `2000 K` along with lime, the process not only produces steel but also produces a silicate sla

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The following is the operating temperatures of the sodium –sulphur battery. • 400 to 600°C • 1000 to 1500°C • 300 to 350°C • 100 to 200°C

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Last Answer : • 300 to 350°C

The binder normally used in flexible pavement construction is (A) Cement (B) Lime (C) Bitumen (D) None of the above

Description : The binder normally used in flexible pavement construction is (A) Cement (B) Lime (C) Bitumen (D) None of the above

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