Fuels and Combustion multiple choice questions
Fuels and Combustion
1. The following is (are) used as additives for Compressed Ignition engine fuels.
a) Amyl Nitrate
b) Ethyl Thionitite
c) Amyl Nitrite
d) All of the above
Answer: All of the above
2. In order to have good engine performance
a) The fuel should have low boiling temperature for lower warm up period
b) The percentage of volume evaporated at low temperatures should be small
c) A rich mixture of air-fuel ratio of 12 to 13:1 is considered to be suitable for easy starting of the engine
d) All of the above
Answer: All of the above
3. The solid fuels can be used in Internal combustion engine only after their
a) Solidification
b) Liquefaction
c) Gasification
d) All of the above
Answer: Gasification
4. Decomposition of higher hydrocarbon molecules into lower hydrocarbons having lower boiling temperatures is known as
a) Polymerization
b) Hydrogeneration
c) Isomerization
d) Cracking
Answer: Cracking
5. The following is the desirable property (ies) of good Internal Combustion engine fuel
a) High energy content per unit quantity of fuel
b) Free from fire hazards
c) Low toxicity
d) All of the above
Answer: All of the above
6. The following is not normal paraffin.
a) Methane
b) n-butane
c) n-octane
d) Iso-octane
Answer: Iso-octane
7. The major constituent of natural gas is
a) Methane
b) Ethane
c) Propane
d) Butane
Answer: Methane
8. The antiknock property of the fuel depends on its
a) Self-ignition temperature
b) Molecular structure
c) Chemical composition
d) All of the above
Answer: All of the above
9. Bomb calorimeter is used to determine the calorific value of the following fuels
a) Solid fuels
b) Liquid fuels
c) Both ‘a’ and ‘b’
d) None of the above
Answer: Both ‘a’ and ‘b’
10. Iso-octane and n-heptane has assigned a rating of
a) 0, 100
b) 50, 50
c) 100, 0
d) 20, 80
Answer: 100, 0
11. Compression ratio at which the fuel can be used in an engine without detonation on a specific test engine under standard operating conditions is known as
a) Highest useful compression ratio
b) Lowest useful compression ratio
c) Optimal useful compression ratio
d) Minimal useful compression ratio
Answer: Highest useful compression ratio
12. The following is used for rating for Compression ignition engines.
a) Octane number
b) Cetane number
c) Butane number
d) All of the above
Answer: Cetane number
13. The ratio of mass per unit volume of oil to the mass of water to the same volume at standard temperature of 15 degree is known as
a) Mass density of diesel oil
b) Specific gravity of diesel oil
c) Specific density of diesel oil
d) None of the above
Answer: Specific gravity of diesel oil
14. The following method is used for analysis of combustion products (flue gases)?
a) Non Dispersive Infra-Red Analyzer
b) Flame Ionization Detector
c) Flue Gas Analyzer for Boiler Flue Gases
d) All of the above
Answer: All of the above
15. The difference of actual air supplied and the stoichiometric air required for complete combustion of fuel is called
a) Excess air
b) Theoretical air
c) Combustion air
d) Dry air
Answer: Excess air
16. To measure the energy released by fuels by cooling it, the standard temperature (in degree) and pressure (atm) are taken as
a) 0 degree, 1 atm
b) 25 degree, 1 atm
c) 0 degree, 2 atm
d) 25 degree, 2 atm
Answer: 25 degree, 1 atm
17. A mixture of theoretical air and fuel for complete combustion of fuel is called
a) Rich mixture
b) Lean mixture
c) Air-fuel mixture
d) Stoichiometric mixture
Answer: Stoichiometric mixture
18. The heat energy released is measured with the help of
a) Energy meter
b) Thermometer
c) Calorimeter
d) Anemometer
Answer: Calorimeter
19. Mixture strength is defined as the ratio of
a) Stoichiometric Air-fuel ratio / Actual Air-fuel ratio
b) Stoichiometric Air-fuel ratio / Theoretical Air-fuel ratio
c) Actual Air-fuel ratio / Stoichiometric Air-fuel ratio
d) Theoretical Air-fuel ratio / Stoichiometric Air-fuel ratio
Answer: Stoichiometric Air-fuel ratio / Actual Air-fuel ratio
20. Which of the following gas (es) is used as fuel in internal combustion engine?
a) Liquefied petroleum gas (LPG)
b) Blast furnace gas
c)Coke oven gas
d) All of the above
Answer: All of the above
a) Amyl Nitrate
b) Ethyl Thionitite
c) Amyl Nitrite
d) All of the above
Answer: All of the above
2. In order to have good engine performance
a) The fuel should have low boiling temperature for lower warm up period
b) The percentage of volume evaporated at low temperatures should be small
c) A rich mixture of air-fuel ratio of 12 to 13:1 is considered to be suitable for easy starting of the engine
d) All of the above
Answer: All of the above
3. The solid fuels can be used in Internal combustion engine only after their
a) Solidification
b) Liquefaction
c) Gasification
d) All of the above
Answer: Gasification
4. Decomposition of higher hydrocarbon molecules into lower hydrocarbons having lower boiling temperatures is known as
a) Polymerization
b) Hydrogeneration
c) Isomerization
d) Cracking
Answer: Cracking
5. The following is the desirable property (ies) of good Internal Combustion engine fuel
a) High energy content per unit quantity of fuel
b) Free from fire hazards
c) Low toxicity
d) All of the above
Answer: All of the above
6. The following is not normal paraffin.
a) Methane
b) n-butane
c) n-octane
d) Iso-octane
Answer: Iso-octane
7. The major constituent of natural gas is
a) Methane
b) Ethane
c) Propane
d) Butane
Answer: Methane
8. The antiknock property of the fuel depends on its
a) Self-ignition temperature
b) Molecular structure
c) Chemical composition
d) All of the above
Answer: All of the above
9. Bomb calorimeter is used to determine the calorific value of the following fuels
a) Solid fuels
b) Liquid fuels
c) Both ‘a’ and ‘b’
d) None of the above
Answer: Both ‘a’ and ‘b’
10. Iso-octane and n-heptane has assigned a rating of
a) 0, 100
b) 50, 50
c) 100, 0
d) 20, 80
Answer: 100, 0
11. Compression ratio at which the fuel can be used in an engine without detonation on a specific test engine under standard operating conditions is known as
a) Highest useful compression ratio
b) Lowest useful compression ratio
c) Optimal useful compression ratio
d) Minimal useful compression ratio
Answer: Highest useful compression ratio
12. The following is used for rating for Compression ignition engines.
a) Octane number
b) Cetane number
c) Butane number
d) All of the above
Answer: Cetane number
13. The ratio of mass per unit volume of oil to the mass of water to the same volume at standard temperature of 15 degree is known as
a) Mass density of diesel oil
b) Specific gravity of diesel oil
c) Specific density of diesel oil
d) None of the above
Answer: Specific gravity of diesel oil
14. The following method is used for analysis of combustion products (flue gases)?
a) Non Dispersive Infra-Red Analyzer
b) Flame Ionization Detector
c) Flue Gas Analyzer for Boiler Flue Gases
d) All of the above
Answer: All of the above
15. The difference of actual air supplied and the stoichiometric air required for complete combustion of fuel is called
a) Excess air
b) Theoretical air
c) Combustion air
d) Dry air
Answer: Excess air
16. To measure the energy released by fuels by cooling it, the standard temperature (in degree) and pressure (atm) are taken as
a) 0 degree, 1 atm
b) 25 degree, 1 atm
c) 0 degree, 2 atm
d) 25 degree, 2 atm
Answer: 25 degree, 1 atm
17. A mixture of theoretical air and fuel for complete combustion of fuel is called
a) Rich mixture
b) Lean mixture
c) Air-fuel mixture
d) Stoichiometric mixture
Answer: Stoichiometric mixture
18. The heat energy released is measured with the help of
a) Energy meter
b) Thermometer
c) Calorimeter
d) Anemometer
Answer: Calorimeter
19. Mixture strength is defined as the ratio of
a) Stoichiometric Air-fuel ratio / Actual Air-fuel ratio
b) Stoichiometric Air-fuel ratio / Theoretical Air-fuel ratio
c) Actual Air-fuel ratio / Stoichiometric Air-fuel ratio
d) Theoretical Air-fuel ratio / Stoichiometric Air-fuel ratio
Answer: Stoichiometric Air-fuel ratio / Actual Air-fuel ratio
20. Which of the following gas (es) is used as fuel in internal combustion engine?
a) Liquefied petroleum gas (LPG)
b) Blast furnace gas
c)Coke oven gas
d) All of the above
Answer: All of the above
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