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Fuels and combustion
| 1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
| 2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
| Q1 ⇒ The calorific value of L.D. converter gas is about __________ Kcal/Nm3 . 1800 [other wrong options] [Discuss in forum] |
| Q2 ⇒ Mott and Wheeler test is conducted on coke to find its reactivity with O2. [other wrong options] [Discuss in forum] |
| Q3 ⇒ A coal having high amount of volatile matter all (a), (b) and (c). [other wrong options] [Discuss in forum] |
| Q4 ⇒ Coking time in narrow by-product coke ovens is around __________ hours. 18 [other wrong options] [Discuss in forum] |
| Q5 ⇒ Presence of free moisture in coal during its high temperature carbonisation protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls. [other wrong options] [Discuss in forum] |
| Q6 ⇒ Very __________ coals are completely devoid of cokability i.e, it is non coking. both 'a' & 'b' [other wrong options] [Discuss in forum] |
| Q7 ⇒ Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec. 10 [other wrong options] [Discuss in forum] |
| Q8 ⇒ Traces of tar fog present in the coke oven gas is removed by electrostatic precipitator. [other wrong options] [Discuss in forum] |
| Q9 ⇒ The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C. 350 to 450 [other wrong options] [Discuss in forum] |
| Q10 ⇒ Width of the coke oven towards coke side is slightly more than that on pusher side to facilitate easy discharging of coke as it swells during carbonisation. [other wrong options] [Discuss in forum] |
| Q11 ⇒ Dry air requirement for burning 1 Nm3 of CO to CO2 may be around __________ Nm3. 2.4 [other wrong options] [Discuss in forum] |
| Q12 ⇒ Turndown ratio of a gas burner is equal to the both (a) & (b). [other wrong options] [Discuss in forum] |
| Q13 ⇒ High ash coals require longer time of carbonisation as ash offers resistance to heat transfer. [other wrong options] [Discuss in forum] |
| Q14 ⇒ Preheating of coal charge for the coke ovens reduces the all (a), (b) and (c). [other wrong options] [Discuss in forum] |
| Q15 ⇒ By-products are __________ recovered in 'Beehive ovens'. not at all [other wrong options] [Discuss in forum] |
| Q16 ⇒ Fossil fuels mean those fuels which are found in the crust of earth. [other wrong options] [Discuss in forum] |
| Q17 ⇒ Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter. Bomb [other wrong options] [Discuss in forum] |
| Q18 ⇒ Gobar gas is produced by the __________ of cown dung. fermentation [other wrong options] [Discuss in forum] |
| Q19 ⇒ Ultimate analysis of coal determines its __________ content. carbon, hydrogen, nitrogen & sulphur. [other wrong options] [Discuss in forum] |
| Q20 ⇒ Largest constituent of coke oven gas is H2 [other wrong options] [Discuss in forum] |
| Or |