b. Esters d. Carbon dioxide 21. The primary grading system used for motor fuels

Question

b. Esters d. Carbon dioxide 21. The primary grading system used for motor fuels is the rating. 11 a. research c. octane d. motor b. heptane 22. A chemical reaction that produces energy in the form of light, heat and/or electricity is called a. exothermic b. endothermic c. isotropic d. none of the above 23.A 10W-30 weight oil exhibits which of the following properties? 11 a. 10 weight at higher temperatures, 30 weight at lower temperatures b. 10 weight at lower temperatures, 30 weight at higher temperatures c. exhibits an average viscosity of (10+30)/2 d. exhibits a 10 weight viscosity at temperatures above 30OF

Explanation / Answer

21.grading system for motor fuel is the octane rating.So option C.

22.Exothermic reaction ..option A.

23. 10 weight at lower temperature and 30 weight at higher temperature. So option B.

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