A. Reactivity
B. Hardness
C. Strength
D. None of these
Correct Answer: Reactivity ✔
Last Updated: March 08, 2019
Related MCQs
- A particular coal is said to be free burning when it __________?
- Ultimate analysis of coal determines its __________ content?
- Higher efficiency in the combustion of solid fuel cannot be achieved by__________?
- If oxygen content in the flue gas rises too high, fuel is being wasted by __________?
- During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the__________?
- __________ process is meant for direct hydrogenation of coal to produce liquid fuel?
- One kg of carbon for theoretically complete combustion requires __________ kg of air?
- When incomplete combustion loss is high, the flue gas analysis shows large amount of __________?
- Naphthalene recovered from coke oven gas is used__________?
- Grindability index of a coal is 100. It implies that the __________?
- In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the__________?
- Which of the following is not a manufactured fuel ?
- Prime coking coal is always blended with medium or non- coking coal before carbonisation__________?
- Low temperature carbonisation of coal takes place at __________ °C?
- With increase in calorific value of fuels, their adiabatic flame temperatures__________?
- Which of the following is not applicable to fluidised bed combustion of coal ?
- Efficiency of the combustion of a fuel is judged by the __________ the flue gas?
- Preheating of a gaseous fuel results in increased__________?
- Mineral matter content (M) and ash content A. in coal are approximately related as __________?
- Which of the following gaseous fuels is likely to have the highest gross calorific value ?
- Coke oven gas compared to blast furnace gas is__________?
- Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction ?
- Calorific value of gobar gas (containing CH4 = 60% , H2 = 10% ; CO2 = 30%) may be about __________ Kcal/Nm3?
- Calorific value as determined by bomb calorimeter is the__________?
- Which adsorbent is used for removing sulphur compounds (S Q, H2S, RSH etc.) removal from coke oven gas in by-products recovery plant ?
- Which of the following fuels has the highest calorific value per unit mass (kcal/kg) ?
- Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker?
- The calorific value of natural gas is about __________ kcal/Nm3?
- High amount of sulphur and phosphorous in coke causes __________ ?
- A coal containing high amount of volatile matter will have__________?
- Coke oven gas is a better fuel than blast furnace gas, because of its higher__________?
- Which of the following is not a micro component present in coal ?
- Which of the following would require maximum amount of % excess air for complete combustion ?
- Coking time in a commercial high temperature coal carbonisation plant is about __________ hours?
- With increase in C/H ratio of a fuel, the dew point of flue gases__________?
- High temperature carbonisation of coal takes place at __________ °C?
- When the coal is heated in absence of air, it is called its __________?
- Out of the following fuels, the difference between gross and net calorific value will be minimum in case of__________?
- A good quality coal should have __________?
- Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent?
- Which of the following is a measure of the agglutinating (i.e., binding) property of coal ?
- By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of__________?
- Low temperature oxidation of coal is accelerated by the__________?
- As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion __________ for the same percentage of excess air?
- Preheating of __________ the flame temperature?
- With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases?
- If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as__________?
- Presence of force moisture in coal is most disadvantageous during its __________?
- High ash coals __________?
- Moisture loss is determined by the __________?
- Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis?