Explanation: The bio methane is produced by the anaerobic oxidation of biomass. The biomass can be compressed in the same way as natural gas(CNG).

Explanation: Bio gas is compressed and used as the motor fuel. The bio gas is blended with the petrol to be used as the transportation fuels.

Explanation: The digestrate is used as the agricultural fertilizers. The bio methane is used by gas turbines to produce electricity and heat.

Explanation: Bio diesel is produced by the transesterification of the vegetable oil. The fermentation is the process of producing alcohol. The process of refining the petroleum is called distillation.

Explanation: The bio diesel contains long chain of carbon atoms that having an ester group on one end. Its structure is CH3—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—COOCH3.

Explanation: The only difference between the structure of bio diesel and regular diesel is an ester group. The structure of the bio diesel is CH3—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—COOCH3 and the structure of the regular diesel is CH3—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH2—CH3.

Explanation: The first diesel engine did not run on diesel fuel but on the vegetable oil. Diesel engines can burn bio diesel fuel with no modifications as it has similar structure to regular diesel.

Explanation: The vegetable oil is three times larger than that of the normal diesel molecule. The large size of vegetable oil causes gels in cold weather.

Explanation: The transesterification is done in presence of methanol, NaOH and KOH. The transesterification is done to prevent the formation of gels in cold weather.

Explanation: If the traces of the water are left in the vegetable oil then the water will be reacted with the vegetable oil and forms the soap.

Explanation: Fuel cell is an electronic device that converts the chemical energy contained in an easily available fuel oxidant system into the mechanical energy.

Explanation: Fuel cells are characterized by high efficiency. It is also characterized by the low noise level, free from vibrations and there is heat transfer.

Explanation: The hydrogen-oxygen fuel cells consist of the two inert porous electrodes. It is made of graphite impregnated with the finely divided platinum or an alloy of Pb with Ag or Ni.

Explanation: The hydrogen-oxygen fuel cells have electrolyte solution of 2.5% of KOH. Through the anode hydrogen gas is bubbled.

Explanation: From cathode, the oxygen gas is bubbled and the hydrogen gas is bubbled from the cathode in hydrogen-oxygen cell.