____________________ are used to control the voltage output of shunt generators.
Fill in the blank(s) with the appropriate word(s).
Field rheostats
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Requests for Proposal (RFPs) are used to _____.
a. assist OSHA representatives on jobsite inspections b. obtain price quotations required to negotiate change orders c. request information about a problem or variance d. gather project information and solutions in the prebid phase
Repeat Problem 6-18 for the expected repair periods of 1 hr, 1.5 hr, 2.5 hr, 2.75 hr, and 3 hr. Plot a graph of average individual delay vs the repair period and use this graph to discuss the effect of the expected repair time on the average delay.
What will be an ideal response?
The decomposition of nitrogen dioxide 
into nitrogen monoxide 
and oxygen is a second-order reaction. This means that the concentration C of 
at time t is given by 1/C=kt+1/
, where is the initial concentration and k is the rate constant. Assume the initial concentration is known to be 0.03 mol/L exactly. Assume that time can be measured with negligible uncertainty.
a. After 40 s, the concentration C is measured to be 0.0023 ± 2.0 ×10–4mol/L. Estimate the rate constant k, and find the uncertainty in the estimate.
b. After 50 s, the concentration C is measured to be 0.0018 ± 2.0 ×10–4mol/L. Estimate the rate constant k, and find the uncertainty in the estimate.
c. Denote the estimates of the rate constant k in parts (a) and (b) by 
, respectively. The average 
is used as an estimate of k. Find the uncertainty in this estimate.
d. Find the value of c so that the weighted average 
has the smallest uncertainty.
Air leaking out of a building is called
A) infiltration B) exfiltration C) ventilation D) exhaust