Tag: biogas

Questions Related to biogas

The output of a given windmill

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. increases with an increase in wind velocity.

  2. decreases with an increase in wind velocity.

  3. is independent of wind velocity.

  4. cannot be determined

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Correct Option: A

Biogas is a mixture of

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. $CO + H _2 + CH _4$

  2. $CO _2 + CH _4 + H _2 + H _2 S$

  3. $CO + H _2$

  4. $CO _2 + N _2$

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Correct Option: B

The main constituent of bio-gas is

physics sources of energy biomass and biogas biogas conventional sources of energy

  1. carbon monoxide

  2. hydrogen

  3. methane

  4. carbon dioxide

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Correct Option: C

In a wind mill the electric energy is converted into mechanical energy.         

physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

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Correct Option: B
Explanation:

Answer is B.
Windmills, like waterwheels, were among the original prime movers that replaced animal muscle as a source of power. They were used for centuries in various parts of the world, converting the energy of the wind into mechanical energy for grinding grain, pumping water, and draining lowland areas.
Kinetic energy of the wind is transformed into mechanical energy of the turning windmill. This can be used to turn a generator to generate electricity. The original energy to cause the wind to blow came from the sun. Uneven heating of the earth's surface causes wind.
Hence, the statement is false.

65% by volume is hydrogen gas in the biogas. 

physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

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Correct Option: B
Explanation:

Answer is B.

Biogas is characterized based on its chemical composition and the physical characteristics which result from it. It is primarily a mixture of methane (${ CH } _{ 4 }$) and inert carbonic gas (${ CO } _{ 2 }$). However the name 'biogas' gathers a large variety of gases resulting from specific treatment processes, starting from various organic waste - industries, animal or domestic origin waste, etc . 
Hence, the statement is false.

The gas obtained by the fermentation of biomass is :

physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

  1. LPG

  2. CNG

  3. hydrogen

  4. biogas

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Correct Option: D
Explanation:

Fuel-grade ethanol is one energy source that has great potential for being generated from biomass. The gas obtained by the fermentation of biomass is called biogas.

Gobar gas is a:

physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

  1. solid fuel

  2. liquid fuel

  3. primary fuel

  4. secondary fuel

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Correct Option: D
Explanation:

Biogas is a type of secondary energy because biomass (primary energy) is used to produce biogas by anaerobic digestion into more efficient and higher value fuel.Biogas is also called gobargas as made by waste remains of plants and animals.

Which of the following is released from biomass?

physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

  1. Cow-dung

  2. Methane

  3. Oxygen

  4. Helium

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Correct Option: B
Explanation:

Major gases released from biomass are methane ($CH _4$), carbon dioxide ($CO _2$), hydrogen ($H _2$) and hydrogen sulphide ($H _2S$).

The residue left after methane production from cattle dung is:

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

  1. burnt

  2. burned in land fills

  3. used as manure

  4. used In, civil construction

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Correct Option: C
Explanation:
The residue left after methane production from cattle dung is used as manure because it supply some organic materials and minerals to the soil.
So, the correct answer is 'used as manure'

What would happen if oxygen availability to activated sludge flocs is reduced ?

zoology microbes in human welfare biogas environmental use of microorganism microbes in waste treatment and biogas

  1. It will slow down the rate of degradation of organic matter.

  2. The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs.

  3. Flea would Increase in size as anaerobic bacteria would grow around flocs.

  4. Protozoa would grow in large numbers.

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Correct Option: A
Explanation:

Oxygen is very important for the microorganism to break down and degrade the organic matter which is present in the sewage or the activated sludge. If the oxygen availability of the activated sludge floc is reduced then the degradation rate will slow down.

So, the correct option is 'it will slow down the rate of degradation of organic matter'