Q: What does CNG stand for and why it is considered to be better fuel than petrol?

\$\text{CNG (Compressed Natural Gas)}\$ is considered to be a better fuel than petrol as it is less harmful to environment and less costly than petrol. It burn smokeless and also doesn't produce deadly and harmful gases as petrol produces.

Q: Which among the following is considered as the cleanest fuel?

Liquefied Petroleum Gas is considered as cleanest fuel because of the following reasons: LPG has a high calorific value. The calorific value of LPG is about 50 KJ/g.It is very neat and clean domestic fuel. LPG burns with a blue smokeless flame and leaves no ash behind. So, it does not cause any pollution. Therefore, LPG is a clean fuel.It does not produce any poisonous gases on combustion.LPG is easy to handle and convenient to store.LPG is easy to handle and can be ignited almost instantaneously.Hence, the correct option is \$D\$

Q: Major constituent of LPG is:

Liquefied petroleum gas or liquid petroleum gas (LPG or LP gas), also referred to as simply propane or butane, are flammable mixtures of hydrocarbon gases used as fuel in heating appliances, cooking equipment, and vehicles. The percentage of butane is around 70% and that of propane is around 30%.

Q: LPG consists of mainly:

Liquefied Petroleum Gas or LPG consists mainly of methane, propane, propylene, butane, and butylene in various mixtures. It is produced as a by-product of natural gas processing and petroleum refining. The components of LPG are gases at normal temperatures and pressures.

Q: Which of the following gas (es) is used as fuel in internal combustion engine?

Otto cycle is the typical cycle for most of the cars internal combustion engines that work using gasoline as a fuel. To reduce pollution LPG is used as a source of clean fuel. Blast furnace gas may be combined with natural gas or coke oven gas before combustion. Hence all of the above are used for internal combustion of engines.

Q: In gobar gas, the maximum amount is that of:

Gobar gas or biogas is mainly composed of methane (\$50-70\%\$), \$CO_2\$ (\$30-40\%\$) and small amounts of \$H_2\$, \$N_2\$ and \$H_2S\$. This is a fuel gas produced by metanogenic bacteria by anaerobic breakdown of biomass.

Q: A liquid fuel used in homes is:

Cooking oil or Vegetable oil can be used as an alternative fuel in diesel engines and in heating oil burners. When vegetable oil is used directly as a fuel, in either modified or unmodified equipment, it is referred to as straight vegetable oil (SVO) or pure plant oil (PPO). Conventional diesel engines can be modified to help ensure that the viscosity of the vegetable oil is low enough to allow proper atomization of the fuel. This prevents incomplete combustion, which would damage the engine by causing a build-up of carbon. Straight vegetable oil can also be blended with conventional diesel or processed into biodiesel or bioliquids for use under a wider range of conditions.Hence, the correct option is \$D\$

Q: The Pollution Standard Index (PSI) scale has span from:

The Pollutant Standards Index, or PSI, is a type of air quality index, which is a number used to indicate the level of pollutants in air. The PSI is reported as a number on a scale of 0 to 500. The index figures enable the public to determine whether the air pollution levels in a particular location are good, unhealthy, hazardous or worse.

Question 1

What does CNG stand for and why it is considered to be better fuel than petrol?

Accepted Answer

$\text{CNG (Compressed Natural Gas)}$ is considered to be a better fuel than petrol as it is less harmful to environment and less costly than petrol. It burn smokeless and also  doesn't produce deadly and harmful gases as petrol produces.

Question 2

Which among the following is considered as the cleanest fuel?

Accepted Answer

Liquefied Petroleum Gas is&#10;considered as cleanest fuel because of the following reasons:&#10;&#10;LPG has a high calorific value.&#10;The calorific value of LPG is about 50 KJ/g.It is very neat and clean&#10;domestic fuel. LPG burns with a blue smokeless flame and leaves no ash behind.&#10;So, it does not cause any pollution. Therefore, LPG is a clean fuel.It does not produce any poisonous&#10;gases on combustion.LPG is easy to handle and&#10;convenient to store.LPG is easy to handle and can be&#10;ignited almost instantaneously.Hence, the correct option is $D$

Question 3

Major constituent of LPG is:

Accepted Answer

Liquefied petroleum gas or liquid petroleum gas (LPG or LP&#10;gas), also referred to as simply propane or butane, are flammable mixtures of&#10;hydrocarbon gases used as fuel in heating appliances, cooking equipment, and&#10;vehicles. The percentage of butane is around 70% and that of propane is around&#10;30%.

Question 4

LPG consists of mainly:

Accepted Answer

Liquefied&#10;Petroleum Gas or LPG consists mainly of methane, propane, propylene, butane,&#10;and butylene in various mixtures. It is produced as a by-product of natural gas&#10;processing and petroleum refining. The components of LPG are gases at normal&#10;temperatures and pressures.

Question 5

The Silent valley movement was related to ?

Accepted Answer

Save Silent Valley is a social movement launched to protect an evergreen tropical forest in the Palaghat district of Kerala. It started in 1973 to save silent valley reserve forest and stop construction of Dam (Hydroelectric Project) in the Valley. There has been massive environmental debates to save the endangered wildlife having natural habitat in the valley. It was declared as Silent Valley National Park later in 1984.

Question 6

The function of automobile catalytic converter is to control emissions of:

Accepted Answer

A catalytic converter is an emissions control device that converts toxic gases and pollutants in the exhaust gas to less toxic pollutants by catalysing a redox reaction (an oxidation and a reduction reaction). Catalytic converters are used with internal combustion engines fuelled by either petrol (gasoline) or diesel&#8212;including lean-burn engines as well as kerosene heaters and stoves. These converters combined oxygen with carbon monoxide ($CO$) and unburned hydrocarbons ($HC$) to produce carbon dioxide and water.

Question 7

Which of the following gas (es) is used as fuel in internal combustion engine?

Accepted Answer

Otto cycle&#10;is the typical cycle for most of the cars internal combustion engines that work&#10;using gasoline as a fuel. To reduce pollution LPG is used as a source of clean fuel.&#10;Blast furnace gas may be combined with natural gas or coke&#10;oven gas before combustion. Hence all of the above are used for internal&#10;combustion of engines.

Question 8

In gobar gas, the maximum amount is that of:

Accepted Answer

Gobar gas or biogas is mainly composed of methane ($50-70\%$), $CO_2$ ($30-40\%$) and small amounts of $H_2$, $N_2$ and $H_2S$. This is a fuel gas produced by metanogenic bacteria by anaerobic breakdown of biomass.

Question 9

A liquid fuel used in homes is:

Accepted Answer

Cooking oil or Vegetable oil can be used as an alternative&#10;fuel in diesel engines and in heating oil burners. When vegetable oil is used&#10;directly as a fuel, in either modified or unmodified equipment, it is referred&#10;to as straight vegetable oil (SVO) or pure plant oil (PPO). Conventional diesel&#10;engines can be modified to help ensure that the viscosity of the vegetable oil&#10;is low enough to allow proper atomization of the fuel. This prevents incomplete&#10;combustion, which would damage the engine by causing a build-up of carbon.&#10;Straight vegetable oil can also be blended with conventional diesel or&#10;processed into biodiesel or bioliquids for use under a wider range of&#10;conditions.Hence, the correct option is $D$

Question 10

The Pollution Standard Index (PSI) scale has span from:

Accepted Answer

The Pollutant Standards Index,&#10;or PSI, is a type of air quality index, which is a number used to indicate the&#10;level of pollutants in air. The PSI is&#10;reported as a number on a scale of 0 to 500. The index figures enable the&#10;public to determine whether the air pollution levels in a particular location&#10;are good, unhealthy, hazardous or worse.