21.) The higher the octane levels the gasoline burns. A. slower B. faster 22.) L

Question

21.) The higher the octane levels the gasoline burns. A. slower B. faster 22.) Lead (Pb) was phased out of gasoline because: A. itlowered the octane rating B. itraised the octane rating C. itpolluted theenvironment D. it was suspected as carcinogenic E. all exceptA 23.) In the US today, perhaps the single most popular gasoline additive is: A. Lead B. MTBE C. alcohol D. RFG E. hybrid technology 24.) Which of these is not a biofuel? A. methanol B. hydrogen C. gasohol D. ethanol E. biogas 25.) Which of these fuels produces the least earbon dioxide emission per unit of energy? A. Nuclear power B. Natural gas C. Oi D.Coal E. Oil sand

Explanation / Answer

Ans 21) a) Slower – If there is high octane, in that case the gasoline burns slower. It is because it is resistant to knock on being subjected to higher RPM and cylinder pressure.

Ans 22) e) All except A

Lead was initially added to gasoline as it was considered to be an enhancer for octane but gradually it was found out that is pollutes the environment with its toxic properties and has carcinogenic properties.

Ans 23) B) MTBE - In US it is the most popular additive for gasoline as it is considered to enhance the properties.

Ans 24) b) Ethanol

Ans 24) b) Hydrogen – It is the simplest component and cannot be used as a biofuel. The remaining of them can be used as biofuel extracted from different source.

Ans 25) b) Natural Gas – It is a type of fossil fuel which is used for wide variety of work and is a non-renewable energy source.

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