Tag: bioenergy

Quizzes (9) Questions (112)

Questions Related to bioenergy

Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Methanogens converts

  1. Methyl alcohol into methane

  2. Formic acid into methane

  3. Acetic acid into methane

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Methanogens are anaerobic archaea that produce methane as a metabolic byproduct. They are capable of utilizing various substrates, including acetate, formate, and methanol, to generate methane.

Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Anaerobic sludge digesters and inoculums are part and parcel of _____________.

  1. Primary sluge

  2. Activated sludge

  3. BOD

  4. FIocs
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Anaerobic digestion is a collection of a process by which microorganism break down biodegradable material in the absence of oxygen and some of these processes are used in the waste Industries to manage the waste. Primary sludge is a result of the capture of suspended solids and organics materials. In the primary process of waste management, the material is treated in a variety of ways. During the biological treatment of the waste a part of activated sludge is used as inoculum and they are passed into the last tank which is known as anaerobic sludge digester. The microorganism present in the sludge gets killed.


So, the correct option is 'Primary sludge'.

Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Which of the following is correct about biogas?

  1. Methane gas is produced along with ethyl alcohol by methanogen

  2. Methanogens acts on cellulose and release biogas

  3. Biogas is produced by thunder and lightening
  4. Maximum gas found in biogas is $CO _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Methanogens are present in the rumen of cattle that is present in dung as well. Methanogens acts on the cellulose content of the and  It helps in the production of methane gas that is a component of biogas.
  • Hence Methanogens acts on cellulose and release biogas is a correct statement.
  • So, the correct answer is 'Methanogens acts on cellulose and release biogas'.
Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Biogas production is rate limited by

  1. Production of methane

  2. Cellulose digestion

  3. Conversion of monomers to organic acids

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The breakdown of complex polymers like cellulose into simpler monomers is the rate-limiting step in anaerobic digestion. This hydrolysis step is often the slowest part of the process.

Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Temperature suitable for biogas production is

  1. $35^o-40^o$C
  2. $20^o-25^o$C
  3. $30^o-35^o$C
  4. $40^o-44^o$C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Biogas production occurs by the action of anaerobic bacteria on waste materials or raw materials. The reactions are made to occur in specially designed large sized tanks called digesters. The bacteria that decompose  the raw materials and produce biogas can be thermophilic if they survive at a higher temperature or mesophilic if they survive at a moderate temperature. Mesophilic bacteria are active at an optimum temperature of 35° - 40°C and thermophilic bacteria are active at an optimum temperature of 50° - 55°C . 
Hence, option A matches the correct temperature suitable for biogas production.
So, the correct answer is '35° - 40°C'.