When brazing larger joints, _____

a. use only a single orifice torch tip
b. use a soldering flux to make it easier to reach the needed temperature
c. small sections of the joint can be heated and brazed
d. a 95% tin/5% antimony solder is the best choice


c

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A PV system charge controller has a primary function of preventing the ____________________ used in a PV system from being overcharged by the PV system array.

Fill in the blank(s) with the appropriate word(s).

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High bacteria counts lower milk quality

Indicate whether the statement is true or false.

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Answer the following statement(s) true (T) or false (F)

1. Most single-phase motors have fractional horsepower ratings. 2. The rotor of the resistance-start, induction-run motor is the same as that of a three-phase, squirrel-cage induction motor. 3. Universal motors operate at different speeds on dc and single-phase ac. 4. Stepping motors are devices that convert mechanical movement into electrical impulses. 5. When stepping motors are used as two-phase synchronous motors, they have the ability to virtually start, stop, or reverse direction of rotation instantly.

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When the country’s economy is expanding, AB In­vestment Company is optimistic and expects a MARR of 15% on new investments. However, in a receding economy the expected return is 8%. Nor­mally a 10% per year return is anticipated. An ex­panding economy causes the estimates of project life to go down about 20%, and a receding econ­omy causes the life values to increase about 10%. Additionally, the market value after the project’s life varies widely; optimistically, it may be as high as 50% more or as low as 75% of the initial investment.

(a) Summarize the optimistic, most likely, and pessimistic estimates in tabular form.
(b) Use a spreadsheet to calculate and plot the sensitivity of PW versus (1) MARR, (2) life values, and (3) market value for possible in­vestment in one of two locations. Use the most likely estimates for the other parame­ters.
(c) Considering all the analyses, under which scenario, if any, should location Miami or Houston be rejected?

All monetary values are in $1000 units.

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