Fuels and Combustion Questions

• Which of the following is not used as a binder in coal briquetting?
• Gross & net calorific value is the same for
• Stack heat losses can be minimised by
• Adiabatic flame temperature of a fuel is dependent on the initial temperature of
• Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
• In high temperature carbonisation of coal compared to low temperature carbonisation
• Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal.
• Which of the following gaseous fuels has the lowest calorific value?
• The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
• Gross and net calorific value of a fuel will be the same
• The gas which contributes maximum to the heating value of natural gas is
• Low temperature carbonisation
• Presence of free moisture in coal during its high temperature carbonisation
• Natural draught produced by a chimney depends upon the
• Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
• Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
• Which of the following is the most reactive (as regards the formation of CO + H2 from C + H2O)?
• Which of the following is not a product of tar distillation?
• Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
• A coal containing very high percentage of durain is called __________ coal.