Match the furnace with its correct description.
A. blower located below heat exchanger
B. blower located above heat exchanger
C. return and supply ducts are both on top
D. primarily used in crawl spaces
A. upflow
B. downflow
C. low boy
D. horizontal
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The ____________________ provides the crucial air gap across which the high voltage from the secondary coil causes an arc or spark.
Fill in the blank(s) with the appropriate word(s).
Dissolved gases that have almost no effect on water systems include _____.
a. oxygen b. carbon dioxide c. nitrogen d. hydrogen sulfide
The fish that used to be known as pike perch is now referred to as ____________________
Fill in the blank(s) with correct word
A cable is made up of several parallel strands of wire. The strength of the cable can be estimated from the strengths of the individual wires by either of two methods. In the ductile wire method, the strength of the cable is estimated to be the sum of the strengths of the wires. In the brittle wire method, the strength of the cable is estimated to be the strength of the weakest wire multiplied by the number of wires. A particular cable is composed of 12 wires. Four of them have strength 6000 ± 20 lb, four have strength 5700 ± 30 lb, and four have strength 6200 ± 40 lb.
a. Estimate the strength of the cable, and find the uncertainty in the estimate, using the ductile wire method. b. Estimate the strength of the cable, and find the uncertainty in the estimate, using the brittle wire method.