Engineering Questions with Answers - Multiple Choice Questions
Applied Chemistry MCQ – Biomass and Biofuel – 2
The bio methane is produced by the __________ of biomass.
a) Aerobic oxidation
b) Anaerobic oxidation
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).
Bio gas is compressed and used as ________
a) Motor fuel
b) Fuels in vehicles
c) Dog feed
d) Cow feed
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.
The _______ is used as the agricultural fertilizer.
a) Bio ethanol
b) Bio ethane
c) Bio methanol
Explanation: The digestrate is used as the agricultural fertilizers. The bio methane is used by gas turbines to produce electricity and heat.
Bio diesel is produced by the __________ of the vegetable oil.
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.
The bio diesel is the long chain of carbon atoms contains _________ group at one end.
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.
The difference between structure of the bio diesel and the regular diesel is an ester group.
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.
The first diesel engine run on ___________
a) Bio diesel
b) Regular diesel
c) Vegetable oil
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.
The vegetable oil __________times larger than the normal diesel molecule.
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.
The transesterification is done in presence of methanol, NaOH and__________
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.
If the traces of water is left in the vegetable oil then ________ is formed.
b) Bio diesel
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.
Fuels cell is an electrochemical device that converts the chemical energy into the ___________
a) Electrical energy
b) Mechanical energy
c) Static energy
d) Frictional energy
Explanation: Fuel cell is an electronic device that converts the chemical energy contained in an easily available fuel oxidant system into the mechanical energy.
Fuel cells are characterized by the ____________
a) High efficiency
b) High noise levels
c) Vibrations are present
d) No heat transfer
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.
The hydrogen-oxygen fuel cell consists of the _________ inert porous electrodes.
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.
The hydrogen-oxygen fuel cells have electrolyte solution of 2.5% __________
Explanation: The hydrogen-oxygen fuel cells have electrolyte solution of 2.5% of KOH. Through the anode hydrogen gas is bubbled.
From cathode ___________ gas is bubbled in hydrogen-oxygen cell.
Explanation: From cathode, the oxygen gas is bubbled and the hydrogen gas is bubbled from the cathode in hydrogen-oxygen cell.