What is one time constant for a 10 mH inductor connected in series with a 47 k? resistor?
A) 0.213 ?S B) 470 mS C) 213 ?S D) 470 S
A
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What happens to molecular movement as the temperature decreases?
A) Molecular movement increases B) Molecular movement decreases C) Molecular movement does not change D) Molecular movement cannot be measured
Steel cable barriers in highway medians are a low-cost way to improve traffic safety without overstressing department of transportation budgets. Cable barriers cost $44,000 per mile, compared with $72,000 per mile for guardrail and $419,000 per mile for concrete barriers. Furthermore, cable barriers tend to snag tractor-trailer rigs, keeping them from ricocheting back into same-direction traffic. The state of Ohio spent $4.97 million installing 113 miles of cable barriers. Answer the following using both tabulated factors and a spreadsheet function.
(a) If the cable barriers prevent accidents totaling $1.3 million per year, what rate of return does this represent over a 10-year study period? (b) What is the rate of return for 113 miles of guardrail if accident prevention is $1.1 million per year over a 10-year study period?
When using oxyacetylene torches, which valve should be turned off first when shutting the equipment down?
A. Acetylene regulator valve B. Oxygen regulator valve C. Acetylene torch valve D. Oxygen torch valve
Using the logic flowchart in Figure 92-18, what is the first condition listed to check for a compressor that will not run when the contactor is closed?
What will be an ideal response?