Which of the following is true of a semiconductor?

A. four electrons in outer shell
B. less than four electrons in outer shell
C. more than four electrons in outer shell
D. four electrons in inner shell


Answer: A

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The objective of cooling water treatment is to reduce or minimize all of the following except:

a. Scale formation- suspended solids form deposits b. Corrosion- electrochemical reactions with metal surfaces c. Fouling- silt, debris, algae plug exchanger tubes d. Wood decay- fungi e. pH increase or decrease f. water deionization

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A ____ mine is used when a passageway is bored into a hill or mountain

A) drift B) shaft C) slope D) none of these

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Hansus Enterprises is a start-up small business specializing in software systems for machine-based high-school student tutoring in science and math. Sheryl Hansus, the owner, has spoken with lenders to obtain a loan of $50,000 now (year 0), and the same amount in years 3 and 6. Two different repayment schedules are available. They are:

Schedule A: Pay a uniform amount of $19,500 in years 3 through 12. Schedule B: Pay a uniform amount of $20,000 in years 1 through 6, with “balloon” payments of an additional $20,000 in year 2 and a final amount of $40,000 in year 7. To assist in the decision of which schedule to se­lect, determine the following using a spreadsheet: (a) Total amount repaid for each schedule. Which is smaller? (b) The equivalent annual worth of the loan amounts and of the repayments at i = 5% per year over a 12-year evaluation period. Which schedule has the smaller loss per year? Why is this the case?

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When ductwork fittings are fafricated, there is more waste with fittings than straignt duct.

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

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