Question 31 : Which of these gases or liquids are not used as source of hydrogen in fuel cells?
1. C₂H₆
2. C₂H₂
3. C₆H₆
4. C₂H₅OH
View Answer   Discuss with Members

Question 32 : Which among the following is not an adverse environmental impact of tidal power generation?
1. Interference with spewing and migration of fish
2. Pollution and health hazard in the estuary due to blockage of flow of polluted water into the sea
3. Navigational hazard
4. None of the mentioned
View Answer   Discuss with Members

Question 33 : Which among the following is not a renewable source of energy?
1. Solar energy
2. Biomass energy
3. Hydro-power
4. Geothermal energy
View Answer   Discuss with Members

Question 34 : Fuel cell converts chemical energy to electrical energy using a reaction that
1. eliminates combustion of fuel
2. requires combustion of fuel
3. requires no ignition of fuel
4. fuel is not required
View Answer   Discuss with Members

Question 35 : What is the voltage output of hydrogen-oxygen fuel cell?(in V)
1. -1.23
2. -1.45
3. -1.01
4. -.93
View Answer   Discuss with Members

Question 36 : The pressure at the end of compression, in diesel engines, is approximately
1. 10 bar
2. 15 bar
3. 20 bar
4. 35 bar
View Answer   Discuss with Members

Question 37 : The stage in which the biological processes are used to purify water in a wastewater treatment plants is called
1. secondary sewage treatment
2. primary sewage treatment
3. wastewater reduction
4. biochemical reduction
View Answer   Discuss with Members

Question 38 : Steam reforming is currently the least expensive method of producing:
1. Coal
2. Biogas
3. Hydrogen
4. Natural gas
View Answer   Discuss with Members

Question 39 : Which of the following is a prime health risks associated with greater UV radiation through the atmosphere due to depletion of stratospheric ozone?
1. Damage to digestive system
2. Increased liver cancer
3. Neurological disorder
4. Increased skin cancer
View Answer   Discuss with Members

Question 40 : The hydrocarbons cracked with steam in fuel cells do not give rise to
1. CO
2. CO₂
3. H₂
4. H₂O
View Answer   Discuss with Members