What are free electrons?
A) Electrons that flow without any energy input
B) Electrons that escape from conductors into the surrounding air
C) Electrons that are no longer bound to their atoms
D) Electricity that the power company does not charge for
C
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The radius of a horizontal curve on an existing highway was field-measured to be 810 ft. The pavement on this two-lane highway is 22 ft wide, and the elevation difference between the inside and outside of the curve is 1.43 ft. The posted speed limit on the road is 60 mi/h. Is this a hazardous location? If so, why? What action will you recommend to correct the situation?
What will be an ideal response?
Studies were conducted at two sites on rural roads with similar characteristics. The first site was 5.1 miles in length with an ADT of 6700. Over the year-long study period, 28 crashes occurred on this portion of roadway, five of them resulting in fatalities. The second site was a 11.2-mile section with an ADT of 5300. There were 32 crashes in this section with four crashes resulting in fatalities. Determine the total crash rate (all types of crashes) and the fatal crash rates for both locations, and discuss the implications.
What will be an ideal response?
All of the following are arguments for government regulation except
a. it is needed to keep larger firms from driving out weaker firms. b. it is needed to support various laws. c. it is needed to maintain a reasonable level of competition for the public good. d. it is needed to keep unscrupulous businesspeople from resorting to unethical and illegal behavior on a regular basis. e. All of these are arguments for government regulation.
How is the airflow adjusted on most commercial air handlers?
A) By adjusting the pitch of the blades on the blower wheel B) By increasing or decreasing the voltage to the fan motor C) By moving the speed tap on the blower motor D) By adjusting the sheave on an adjustable pulley