What should the warning indicator for oil pressure do when the ignition key is turned to the run position and then after the engine is started?
A. stay off
B. stay on
C. on while the key is on and engine off and off while the engine is running
D. on for one second and then stay off before and after the engine is started
Answer: C
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Which factor does not affect resistance?
A) the cross-sectional area of the material B) the weight of the material C) the resistivity of the material D) the length of the material
Compare polycarbonate and polystyrene in the following properties and explain your answer on a molecular basis: tensile strength, impact toughness, melting point, abrasion resistance, clarity, solvent resistance, and cost. (Note: This question could be applied to any two polymers.)
What will be an ideal response?
Former basketball player Shaquille O’Neal weighs approximately 335 lb and wears a size 23 shoe. Estimate the pressure he exerts on a floor. What pressure would he exert if his shoe size were 13? State all your assumptions, and show how you arrived at a reasonable solution.
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. The entire volume of system fluid reaches the maximum fluid temperature simultaneously. 2. Most modern diaphragm-type tanks use a butyl rubber or EPDM diaphragm. 3. It is good practice to install a pressure-regulator valve near the inlet of any expansion tank. 4. The expansion tank should always be connected to the system near the outlet port of the circulator. 5. Many systems with chronic “air problems” can be corrected by simply rearranging the piping so that the circulator pumps away from the point of no pressure change.