Two important features of topography are slope and slope aspect
Indicate whether the statement is true or false.
T
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Which of the following statements is true about economic analysis? Select all that apply.
A) Life cycle cost analysis is standardized in LEED to cover 20 years of cash flow. B) The discount rate represents the reduction in contract cost offered by the low bidder. C) An owner who uses a low discount rate will be more likely to invest in energy saving technology. D) Higher investment could produce superior results with a longer payback period.
For an interest rate of 10% per year, compounded quarterly, determine the number of times interest is compounded (a) per quarter, (b) per 6 months, (c) per year, and (d) per 3 years.
What will be an ideal response?
What is the condenser saturation temperature if there is 20°F of subcooling and the outlet temperature of the refrigerant is 90°F?
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. The power ratings for oscillators range from a few milliwatts to megawatts and their frequency from a few cycles to several billion cycles per second. 2. Saturating the transistor causes the collector-emitter voltage to drop to between .04 and .03 volts. 3. A great advantage of drives using IGBTs is the fact that SCRs are generally used in the power supply. 4. Due to the problem of excessive voltage spikes caused by IGBT drives, some manufacturers produce a motor that is “inverter rated.” 5. Variable frequency drives intended to control motors under 500 Hp generally use SCRs or GTOs.