Provide three reasons why the thermostat should allow the coolant to quickly reach and maintain a high enough temperature.
What will be an ideal response?
1. Its oil becomes thinner. Thinner oil does not provide the same level of lubrication and can escape more easily past the piston rings and into the combustion chamber.
2. Oil oxidizes more rapidly at temperatures above 240°F. Oxidation causes the oil to thicken and can also result in varnish buildup. Varnish can cause hydraulic lifters to stick and fail and can also plug the oil return channels in the oil rings.
3. Excessive engine temperatures can result in engine damage. A hot engine can cause pistons to expand excessively. When a piston scuffs, it can actually weld to the cylinder wall momentarily.
4. Detonation or preignition occurs when fuel explodes due to high engine temperatures. Engine damage can result. It is important that the fuel in the combustion chamber be able to burn evenly.
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The Patriot militia played a crucial role in the Revolution in all of the following ways EXCEPT
A. taking up the task of political education. B. raising funds to support the war effort. C. convincing people that the British army was an unreliable friend. D. mercilessly harassing small British detachments. E. as effective agents of Revolutionary ideas.
In a piston-type compressor, the pistons are driven by a ________.
A) Crankshaft B) Wobble plate C) Swash plate D) Any of the above, depending on the compressor
Human pro-insulin has been made in which of the following?
a. tobacco cells c. carrot cell cultures b. canola seed d. frog embryos
____________________ is an elastic hydrocarbon polymer, which occurs as a milky emulsion.
Fill in the blank(s) with the appropriate word(s).