1. What is the primary component of biogas?
a) Methane
b) Carbon dioxide
c) Hydrogen
d) Oxygen
Answer: a) Methane
Explanation: Biogas primarily consists of methane (CH4), which is the main combustible component responsible for its use as a fuel.
2. Which process is involved in the formation of biogas?
a) Fermentation
b) Combustion
c) Photosynthesis
d) Distillation
Answer: a) Fermentation
Explanation: Biogas is produced through the anaerobic digestion of organic matter, such as agricultural waste, sewage, or food waste, by microorganisms in a process called fermentation.
3. What factor has the most significant impact on biogas formation?
a) Temperature
b) pH level
c) Pressure
d) Oxygen concentration
Answer: a) Temperature
Explanation: Temperature plays a crucial role in biogas formation as it affects the activity of microorganisms responsible for anaerobic digestion. Optimal temperature ranges between 35°C to 40°C for mesophilic bacteria and 50°C to 60°C for thermophilic bacteria.
4. Which type of engines can utilize biogas as fuel?
a) Spark Ignition (SI) engines
b) Compression Ignition (CI) engines
c) Both SI and CI engines
d) None of the above
Answer: c) Both SI and CI engines
Explanation: Biogas can be used as fuel in both Spark Ignition (SI) engines, where ignition occurs by a spark plug, and Compression Ignition (CI) engines, where ignition is initiated by the heat of compression.
5. Which gas is the primary constituent of natural gas?
a) Methane
b) Carbon dioxide
c) Nitrogen
d) Oxygen
Answer: a) Methane
Explanation: Natural gas primarily consists of methane (CH4), which typically accounts for around 70-90% of its composition.
6. What is the primary component of hydrogen gas (H2)?
a) Helium
b) Hydrogen
c) Oxygen
d) Nitrogen
Answer: b) Hydrogen
Explanation: Hydrogen gas (H2) consists of diatomic molecules composed of two hydrogen atoms.
7. Which of the following is a commonly used abbreviation for Liquefied Petroleum Gas?
a) LNG
b) LPG
c) CNG
d) H2
Answer: b) LPG
Explanation: LPG stands for Liquefied Petroleum Gas, which is a common abbreviation used for gases like propane and butane.
8. In which form is natural gas typically stored and transported?
a) Liquid
b) Solid
c) Gas
d) Plasma
Answer: c) Gas
Explanation: Natural gas is typically stored and transported in its gaseous form under high pressure in pipelines or compressed natural gas (CNG) cylinders.
9. Which property of gaseous fuels is crucial for their efficient combustion in engines?
a) Density
b) Viscosity
c) Ignition temperature
d) Stoichiometric ratio
Answer: d) Stoichiometric ratio
Explanation: The stoichiometric ratio, which refers to the ideal ratio of air to fuel required for complete combustion, is crucial for efficient combustion of gaseous fuels in engines.
10. What is the primary safety concern associated with handling gaseous fuels?
a) Flammability
b) Corrosiveness
c) Toxicity
d) Radioactivity
Answer: a) Flammability
Explanation: The primary safety concern associated with handling gaseous fuels is their flammability, which poses a risk of fire or explosion if not handled properly.