A particular coal is said to be free burning when it
(A) Burns completely
(B) Gives smokeless burning
(C) Shows little or no fusing action
(D) None of these

1 Answer

Answer :

(C) Shows little or no fusing action

Related questions

Description : Use of pulverised coal in boilers provides (A) Higher calorific value (B) Better combustion (C) Smokeless burning (D) Less erosion on furnace wall

Last Answer : (B) Better combustion

Description : Use of pulverised coal in boiler furnace provides (A) High calorific value (B) Better combustion (C) Smokeless burning (D) Less erosion on furnace walls

Last Answer : (B) Better combustion

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)

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)

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

Description : I have a black discoloration on the left corner of my bottom lip. It doesn't itch but it burns alot. It feels swollen but it's not. The discoloration has been there for about 1 year and the burning has ... years. I don't know if this could be a side effect. Any ideas/suggestions? I am 53 years old.

Last Answer : Some sort of infection. Go to the doctor and get it biopsied.

Description : My husband's legs are burning ? My husband is 29 years old. A lot of it burns one leg. Burns more on hot days. The legs sweat a lot , and the legs become heavy. The left leg hurts all the time. What is the remedy ? ( He has no problem with diabetes or pressure)

Last Answer : I am giving treatment based on your question , although it would be better to give more details. You can try these medicines by taking ---- " Cap- Pregaba / Gaba-P / Nervalin 25 mg. 1 + 0 + 1 10 days after ... during or after the medicine. Or seek the help of a specialist.

Description : Burning in the toilet for a long time ? I am 18 years old. My toilet has been burning on the street for three years. No blood goes. But very irritating. Urine and frequent burns. Even if you sit ... like a sack that encloses with a drawstring. Please tell, whats the story of them big puppys .....

Last Answer : It causes burning sensation in the urine due to your urinary tract infection. But itching or burning in the anus can be due to various reasons. The most common causes of this problem are high humidity , mild ... of water , do not eat fried or televaja food. Do not eat stale food in the market.

Description : Which of the following is not a chemical action? (a) Burning of coal (b) Conversion of water into steam (c) Digestion of food (d) Burning of paper

Last Answer : Ans:(b)

Description : How can electrical power lines keep burning even after the wire burns through and breaks?

Last Answer : That would be my guess, you still need a path to ground.

Description : (a) Define a balanced chemical equation. Why should an equation be balanced? (b) Write the balanced chemical equation for the following reaction: (i) Phosphorus burns in presence of chlorine to form phosphorus penta chloride. (ii) Burning of natural gas. (iii) The process of respiration. -Chemistry

Last Answer : Answer. (a) Balanced chemical equation has an equal number of atoms of different elements in the reactants and products. According to law of conservation of mass, matter can neither be created nor be destroyed in a chemical ... C6H12O6 (s) + 6O2 (g) + 6H2O ---> 6CO2 (aq) + 12H2O (l) + energy

Description : Why is water not suitable for putting out a petrol fire? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by ... very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns

Last Answer : (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns Explanation: Water is not effective on petrol fire because it has higher density than ... while petrol stays afloat and keeps burning. Petrochemical fires are nearly always extinguished with chemical foam.

Description : Why is water not suitable for putting out a petrol fire? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by ... very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns

Last Answer : (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns Explanation: Water is not effective on petrol fire because it has higher density than petrol as a ... extinguished with chemical foam which forms a blanket over the flames and cuts off the oxygen supply.

Description : Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and ... (c). X- Sulphuric acid and Y- Hydrogen gas (d). X- Hydrochloric acid and Y- Hydrogen gas

Last Answer : (c). X- Sulphuric acid and Y- Hydrogen gas

Description : Burning of Gasoline initially requires heat before it burns spontaneously. Which of the following does not give a good explanation of this phenomenon?  a. the initial heat rises the enthalpy of the reactant ... of products.  d. The enthalpy of the product is lower than the enthalpy of the reactant

Last Answer : the enthalpy of reactants is lower than the enthalpy of products.

Description : Why is water not suitable for putting out a petrol fire ? (1) The oxygen content of water is isolated by petrol and thus it helps in burning (2) Petrol is too inflammable to be extinguished by ... very low (4) Water, being heavy, slips below petrol which thus remains in contact with air and burns 

Last Answer : Water, being heavy, slips below petrol which thus remains in contact with air and burns

Description : Lignite is (A) A high rank coal (B) A coking coal (C) Can be used for gasification and steam generation (D) A black banded coal which burns with a non-smoky yellowish flame

Last Answer : (C) Can be used for gasification and steam generation

Description : Cannel coal (A) Is non-coking (B) Has a high volatile matter content and burns with a luminous smoky flame (C) Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named (D) All (A), (B) and (C

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

Description : Bituminous coal (A) Ignites less easily than anthracite (B) Is generally coking (C) Burns with smoky yellow flame (D) Both (B) and (C)

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

Description : Is there a food that doesn't completely agree with you (that maybe gives you a little push-back) that you still find worth the discomfort/embarrassment?

Last Answer : answer:Pepperoni pizza. Invariably makes me fart. But I love the taste. Asparagus = makes my urine smell. But so what.

Description : Have you had any health concerns after using skoal smokeless tobacco over the years? If so, how long have you been using? How often do you use? etc.

Last Answer : Its the additives that you should worry most about. Still causes mouth cancer and is definetely bad for the heart. http://en.wikipedia.org/wiki/Dipping_tobacco

Description : Explain ‘smokeless air’.

Last Answer : Explain ‘smokeless air’.

Description : Why are People addicted to smokeless tobacco can develop thick leathery white spots in the mouth. What are these spots called?

Last Answer : Need answer

Description : Premier, a smokeless cigarette, failed because it could not be easily lit with a match. This failure was due to: A)poor distribution. B)high prices. C)lack of customer satisfaction. D)poor promotion. E)poor packaging.

Last Answer : C)lack of customer satisfaction.

Description : Coal is pulverised before burning in large capacity boiler furnaces mainly to (A) Ensure its complete combustion (B) Facilitate easy ash removal (C) Enhance its calorific value (D) Provide trouble free operation

Last Answer : (A) Ensure its complete combustion

Description : How much co2 is produced when 4000g of c2h2 burns completely?

Last Answer : Need answer

Description : What is Fusing Factor ?

Last Answer : : The ratio of minimum fusing current and current rating of fuse of fuse is called fusing factor.

Last Answer : Minimum That Amount Current Of flow As a result Fuse His Melts Goes Him 3 Fuse Fusing Current Says.

Description : Why fuses with fusing factor more than 1.5 is not allowed in PVC cables? 

Last Answer : Because PVC cables have low thermal capacity than paper cables. Full loading of PVC only possible if it has close excess current protection (i.e.) Fusing Factor = 1.5 

Description : What is Fusing current ?

Last Answer : Fusing current- the current at which the fuse element melts depends upon the material, length and diameter.

Description : What is fusing factor?

Last Answer : The ratio of minimum fusing current and the current rating of fusing element is called the fusing factor. Fusing factor = minimum fusing current / current rating of fusing element. Its value is always more than 1 (one). 

Description : Which of the following reactions does not produce benzene as one of the products? (a) Treating benzenediazonium chloride with H3PO2 (b) Distilling phenol with zinc dust (c) Fusing sodium benzoate with NaOH (d) Fusing sodium benzenesulfonate with NaOH

Last Answer : Fusing sodium benzenesulfonate with NaOH

Description : When embryosac receives two or more than two pollen tubes the sperm nucleus fusing with the egg nucleus may be derived from one pollen tube and one fusing with the polar nuclei may be derived from other pollen tube, the phenomenon is termed as

Last Answer : When embryosac receives two or more than two pollen tubes the sperm nucleus fusing with the egg nucleus may be derived from one pollen tube and one fusing with the polar nuclei may be derived from other pollen tube, the phenomenon is termed as – Heterofertilization

Description : For a round wire, the approximate value of fusing current is given by

Last Answer : For a round wire, the approximate value of fusing current is given by  K√d3

Description : Aside from coal,oil and natural gas,what organic material burns the hottest?

Last Answer : Magnesium makes incredible fires and AFAIKT burns pretty hot. Do not stare at burning magnesium and once you light it almost impossible to put out. We set a mag wheel on fire one time and it burned like hell and destroyed the concrete it was on.

Description : Which furnace burns low-ash fusion coal and retains most of the coal ash in the slag?

Last Answer : Cyclone furnace.

Description : Sodium borate on reaction with conc. `H_2 SO_4` and `C_2 H_5 OH` gives a compound A which burns with a green edged flame. The compound A is

Last Answer : Sodium borate on reaction with conc. `H_2 SO_4` and `C_2 H_5 OH` gives a compound A which burns with a green edged ... ` D. `(C_(2)H_(5))_(3)BO_(3)`

Description : Why is my urine very cloudy and amp burns when urinating very little urine dehydrated.?

Last Answer : You must see your doctor.

Description : Why is my urine very cloudy and amp burns when urinating very little urine dehydrated.?

Last Answer : You must see your doctor.

Description : Zolpidem differs from diazepam in that: A. It is safer in overdose than diazepam B. Its hypnotic action shows little fading on repeated nightly use C. It causes more marked suppression of REM sleep D. It has more potent muscle relaxant action

Last Answer : B. Its hypnotic action shows little fading on repeated nightly use

Description : Consider the following statements: 1. Gondwana coal is a laminated, bituminous coal. . 2. Gondwana coal is completely free from moisture, sulphur and phosphorus. Which of the statements given above is/are correct? [IAS 2008] (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2

Last Answer : Ans: (a)

Description : Coal is finally pulverised to 200 mesh size for burning in boilers by a (A) Hammer crusher (B) Ball mill (C) Roll crusher (D) Gyratory crusher

Last Answer : (B) Ball mill

Description : The advantages of firing pulverised coal in the furnace lies in the fact that, it (A) Permits the use of high ash content coal (B) Permits the use of low fusion point ash coal (C) Accelerates the burning rate and economises on fuel consumption (D) All (A), (B) and (C)

Last Answer : (C) Accelerates the burning rate and economises on fuel consumption

Description : Which of the following accentuates clinkering troubles on furnace grate burning coal? (A) Low reactivity of carbonised residue containing high proportion of iron & sulphur (B) Low forced draft & fuel bed temperature (C) Thick firebed and preheated primary air (D) All (A), (B) and (C)

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

Description : Which of the following accentuates clinkering trouble on furnace grate burning coal? (A) Low reactivity of carbonised residue containing high proportions of iron & sulphur (B) Low forced draught and fuel bed temperature (C) Thick fire bed and preheated primary air (D) All (A), (B) and (C)

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

Description : Function of secondary air in pulverised coal firing is to (A) Transport the coal to the burner (B) Dry the coal (C) Ensure efficient burning of coal around the burner (D) Reduce primary air requirement

Last Answer : (C) Ensure efficient burning of coal around the burner

Description : The advantage of firing pulverised coal in the furnace lies in the fact, that it (A) Permits the use of high ash content coal (B) Permits the use of low fusion point ash coal (C) Accelerates the burning rate and economises on fuel combustion (D) All (A), (B) and (C)

Last Answer : (C) Accelerates the burning rate and economises on fuel combustion

Description : Caking coal is desirable for (A) Burning on travelling grate (B) Coke making (C) Burning on firebars (D) All (A), (B) and (C)

Last Answer : (B) Coke making

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