Metallurgical Analysis MCQs with Explanations

The correct answer is Option B: 925 °C . Let's understand why we do this test and what it means for coal. Imagine coal as a kind of rock that can burn. When we talk about volatile matter in coal, we are referring to the parts of the coal that turn into gases or vapors when heated strongly, but without any air (oxygen) present. It's like heating wood in an enclosed space; some gases come out before the wood itself starts to burn. Why is this important? Knowing the volatile matter content helps us understand many things about coal: 1. Ignition and Burning: Coal with high volatile matter usually ignites more easily and burns with a longer, more luminous flame. Coal with low volatile matter is harder to ignite. 2. Smoke Production: Higher volatile matter can lead to more smoke during combustion. 3. Industrial Use: Different industries need different types of coal. For example, in coke making (for steel production), the volatile matter content is very critical. 4. Coal Classification: It's one of the key factors used to classify different ranks of coal (like lignite, bituminous, anthracite). How do we determine it? To find the volatile matter content, we follow a standard procedure: 1. A small, carefully air-dried coal sample is weighed. 2. This sample is then placed in a special crucible with a lid (to keep air out). 3. The crucible is then heated in a furnace for a specific time and at a specific temperature. 4. The standard method requires heating the sample for exactly 7 minutes at a constant temperature of 925 °C (plus or minus a small allowance). 5. After heating, the sample is cooled and weighed again. The weight loss (after accounting for moisture) represents the volatile matter that escaped as gas. The temperature of 925 °C is chosen because it ensures that most of the volatile components are driven off, but the coal itself doesn't undergo significant decomposition beyond that point in the given time. This specific temperature and time are part of the standard test method to ensure consistent and comparable results worldwide.

both B and C is the correct answer to “Determination of phosphorous content of iron & steel is done by bringing phosphorous into solution and then finding it by the . . . . . . . . method.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

950 is the correct answer to “Temperature used in the determination of volatile matter of coal is . . . . . . . . °C.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

280 is the correct answer to “For hydrogen analysis in blast furnace, gas by Orsat apparatus, it is completely oxidised in contact with CuO to H 2 O at a-temperature of about . . . . . . . . °C.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

all A, B and C is the correct answer to “Cuprous chloride solution is used in orsat apparatus for selectively absorbing carbon monoxide. However, it is capable of absorbing . . . . . . . . also.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

sulphuric acid and then titrating it with alkali is the correct answer to “Ammonia present in coke oven gas is determined by passing its measured volume through the standard solution of”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

SnCl2 is the correct answer to “During dissolution of iron from iron ore in acid solution, the rate of dissolution is accelerated by the addition of little amount of . . . . . . . . which reduces ferric iron to ferrous state.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

either B or C is the correct answer to “For moisture determination during proximate analysis of coal, -72 mesh coal (2 - 10 gms) is heated between 105 to 110°C”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

weighing 1 gms (air dried) is the correct answer to “Determination of volatile matter in coal, during its proxiinate analysis requires heating of coal sample.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

bomb is the correct answer to “Calorific value of fuel gases is not determined by the . . . . . . . . calorimeter,”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

bomb is the correct answer to “Calorific value of liquid fuels can be determined by calorimeter.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

substracting the sum of percentages of volatile matter and ash of dry coal from 100 is the correct answer to “Fixed carbon of coal during its proximate analysis is determined by”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

temperature maintained is same as that for coal i.e. 775 ± 25°C is the correct answer to “For determination of ash in coke”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

drilling is the correct answer to “Samples for the analysis of solid metallic scrap & alloys are normally taken by”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

(about 100 microns) is the correct answer to “For complete analysis of iron ore, the size of the dried sample should be”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

carbon residue is the correct answer to “Conradson method arid Ramsbottom method is used for the determination of . . . . . . . . of the fuel oil.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

both B and C is the correct answer to “Strohlein apparatus is used for the deter mination of the . . . . . . . . in ferrous materials e.g., iron or steel.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

either B or C is the correct answer to “Carrier agent used in gas analysis by chromatagraph for carrying of gas sample in adsorption coloumn is generally”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

football bladder is the correct answer to “Fuel gas and flue gas samples are most conveniently collected in a”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

lead acetate is the correct answer to “Qualitative determination of H 2 S in gases is done by wetting a filter paper with . . . . . . . . and keeping it in the gas stream. The extent of brown or black colouration of the filter paper givesa rough estimate of H 2 S present in the gas.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

deducting the inorganic sulphur from total sulphur is the correct answer to “Organic sulphur present in coal is found out by”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

moisture is the correct answer to “Dean and stark apparatus is used in the determination of . . . . . . . . content in liquid fuels.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

sand and other fine materials is the correct answer to “A sampling tube known as a thief, which has two concentric and close fitting tubes with matching holes or opening, is used for the sampling of”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

950 is the correct answer to “Loss on ignition (LOI) of iron ore is determined by finiding the loss in weight of the sample by heating it first to 500°C for 5 minutes followed by its heating at . . . . . . . . °C, for 30 minutes.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

800 is the correct answer to “Determination of methane present in coke oven gas by orsat apparatus, it is completely oxidised in contact with CuO to CO 2 and H 2 O at a temperature of, . . . . . . . . . °C.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

sodium or ammonium phosphate is the correct answer to “Determination of alumina (AI 2 O 3 ) in iron ore is based on the selective formation of AIPO 4 from its acidic solution (with cone, HCl) by the addition of”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

775 ± 25 is the correct answer to “Determination of ash content of coal during its proximate analysis, the temperature of weighed coal sample is raised to 400 - 500°C in half an hour and maintained at the same level for further half an hour. The temperature is then raised to . . . . . . . . °C at which the sample is heated for one more hour before weighing it.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

calcined MgO and anhydrous Na2CO3 is the correct answer to “Eschka mixture used in total sulphur determination in coal comprises of a mixture of . . . . . . . . in 2 : 1 ratio by weight.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

ore, coal and coke is the correct answer to “Coning and quartering is a well known process of the sampling of”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

either B or C is the correct answer to “During Orsat analysis of coke oven gas, the unsaturated hydrocarbons (represented by C2. 5 H 5 ) is absorbed by the”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

total is the correct answer to “Eschka process is used for determining the . . . . . . . . sulphur of coal.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

HCl is the correct answer to “Estimation of total iron in oxide ore comprises of three basic steps namely (i) extraction of iron into solution (ii) oxidation for volumetric analysis or precipitation for gravimetric analysis, and (iii) titration in volumetric analysis or ignition and weighting in gravimetric analysis. Which of the following concentrated acid is used for the first step i.e. extraction of iron into solution”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

total is the correct answer to “Bomb calorimeter is used for determining the . . . . . . . . sulphur of coal.”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

all A, B and C is the correct answer to “Potassium hydroxide sulution used as an absorbent in orsat apparatus is capable of absorbing”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

high pressure oxygen at 25 atm is used for its combustion is the correct answer to “In the bomb calorimeter used for the determination of calorific value of coal,”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

Organic sulphur is the correct answer to “Which of the following sulphur compounds present in coal that can not be reduced by washing of coal, is not determined directly”. This question is standard in competitive examination syllabi for Metallurgical Analysis.

Eggertz method is the correct answer to “Combined carbon content in iron and steel is determined by treating the sample with dilute HNO 3 . So that combined carbon forms a soluble brown nitrated compound, the intensity of which is matched with that of a standard sample of similar composition treated under similar condition. The intensity of color produced is proportional to the carbon content of iron of steel sample. This method of combined carbon determination is called the”. This question is standard in competitive examination syllabi for Metallurgical Analysis.