An optional method for determining feeder to schools is covered in _____.
a. NEC® Section 220.102
b. NEC® Section 220.86
c. NEC® Table 220.88
d. NEC® Article 555
b. NEC® Section 220.86
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Discuss why an outside testing agency may be contracted by the owner.
What will be an ideal response?
Each day, a weather forecaster predicts whether or not it will rain. For 80% of rainy days, she correctly predicts that it will rain. For 90% of non-rainy days, she correctly predicts that it will not rain. Suppose that 10% of days are rainy and 90% are non-rainy.
a. What proportion of the forecasts are correct? b. Another forecaster always predicts that there will be no rain. What proportion of these forecasts are correct?
Steam exiting the turbine of a power plant passes through the insulated shell-andtube heat exchanger condenser. The mass flow rate of the steam is 145 kg/s, and the steam enters the heat exchanger as a saturated mixture with a quality of 0.95 at 20 kPa. The steam exits the condenser as a saturated liquid at 20 kPa. Liquid cooling water is used to condense the steam. The cooling water enters the condenser at 10oC.
(a) Determine the exit temperature of the liquid cooling water if the mass flow rate is 4000 kg/s. (b) Using your heat exchanger model, plot the cooling water mass flow rate and volumetric flow rate (entering the condenser) for exit temperatures ranging from 15oC to 55oC. (c) If the exit temperature of the cooling water is regulated such that it must be no greater than 40oC, and if the cooling water flow rate through the condenser can be adjusted in a range from 500 kg/s to 2000 kg/s, what is the range of maximum possible flow rates of steam through the condenser? Given: P1 = 20 kPa; x1 = 0.95; m?s = 145 kg/s; P2 = 20 kPa; x2 = 0 T3 = 10oC, m?cw = 4000 kg/s Assume: Q? = 0 (insulated). Also, given no other information regarding the heat exchanger, make the following common heat exchanger assumptions: W? = ?KE = ?PE = 0 Also, assume the heat exchanger is a multiple-inlet, multiple-outlet, steady-state, steady-flow device. What will be an ideal response?
Biotechnology has been used in the past to create wine and cheese
Indicate whether the statement is true or false