1. Fuel combustion is a process in which _____.
A. Heat is not absorbed nor liberated
B. Heat is absorbed
C. Heat is liberated
D. None of these
ANSWER:C.Heat is liberated
SOLUTION : Heat is liberated.
2. Example of secondary fuel is________.
A. Coke
B. Diesel
C. Kerosene
D. All of these
ANSWER:B.Diesel
SOLUTION:Diesel
3. A good fuel should possess _________
A. High calorific value
B. Moderate ignition temperature
C. It should be pollution free
D. All of the above
ANSWER : D.All of the above
SOLUTION: All of the above
4. Anthracite has _______ of% Carbon.
A. 55 – 65%
B. 60-75%
C. 78 – 90%
D. 94 – 97%
ANSWER:D.94 – 97%
SOLUTION:Anthracite coal has the highest carbon content, about 94% to 97%. It is a hard, compact variety of coal having the highest energy density.
5. Unit of Calorific value of a solid fuel in MKS system is __________.
A. Cal/g
B. Kcal/Kg
C. J/Kg
D. Cal/lit
ANSWER:B.Kcal/Kg
SOLUTION:The unit of calorific value of a solid fuel in the MKS system is kilojoules per kilogram (kJ/kg). Calorific value is the amount of heat energy produced when one kilogram of a fuel is completely combusted. It is also known as calorific power.
6. Calorific value of a fuel is the total quantity of ________ liberated by complete combustion of unit mass/ volume of the fuel.
A. Heat
B. Color
C. Light
D. Combustion gases
ANSWER:A.Heat
SOLUTION:Calorific value: It is the total amount of heat produced by the complete combustion of a unit mass or unit volume of fuel at constant pressure and in normal conditions. It is expressed in the unit kilojoules per kilogram(kJ/Kg).
7. Value of (L) latene heat of condensation of water vapor in cal/gm is of a fuel does not contribute to its calorific value on combustion?
A. 758
B. 875
C. 587
D. 857
ANSWER:C.587
SOLUTION :
587
8. Which of the following is not an advantage of gaseous fuels over solid and liquid fuels ?
A. Their combustion can readily be controlled
B. They cannot be preheated by the heat of the hot waste gases
C. They can be lighted at a moment’s notice
D. They can easily be conveyed through pipelines to the actual place of use
ANSWER: B.They cannot be preheated by the heat of the hot waste gases
SOLUTION:The calorific value of gaseous fuel is greater than that of solids and liquids, which means that it will release a large amount of energy when burned. In addition, these types of fuels generate less air pollution.
9. Gross and Net calorific value of a fuel will be the same ____________.
A. If its ash content is zero
B. If its carbon content is very low
C. If its hydrogen/hydrogen compound content is zero
D. None of the above
ANSWER:C.If its hydrogen/hydrogen compound content is zero
SOLUTION:If a fuel’s hydrogen content is zero, the gross and net calorific value of a fuel will be same.
10. Biogas is produced by anaerobic fermentation of biological materials. The main constituent of biogas is ________.
A. Propane
B. Ethene
C. Butane
D. Methane
ANSWER: D.Methane
SOLUTION:
Biogas is produced under anaerobic conditions; the process is denominated as anaerobic digestion. The major constituent of biogas is methane (55-70%), CO2 (30-45%) and some traces of gases such as H2S and ammonia.