How is heat pump Heating Seasonal Performance Factor, HSPF, calculated?
A) HSPF is the ratio of heat output divided by heat input measured at one particular condition.
B) HSPF is the ratio of heat output divided by heat input averaged for the entire heating season.
C) HSPF is a measure of heating BTU per watt measured at one particular condition.
D) HSPF is a measure of heating BTU per watt averaged for the entire heating season.
D
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Use economic equivalence to determine the amount of money or value of i that makes the following statements correct.
(a) $5000 today is equivalent to $4275 exactly 1 year ago at i = ___% per year. (b) A car that costs $28,000 today will cost $____ a year from now at i = 4% per year. (c) At i = 4% per year, a car that costs $28,000 now, would have cost $____ one year ago. (d) Last year, Jackson borrowed $20,000 to buy a preowned boat. He repaid the principal of the loan plus $2750 interest after only 1 year. This year, his brother Henri borrowed $15,000 to buy a car and expects to pay it off in only 1 year plus interest of $2295. The rate that each brother paid for his loan is ___ % for Jackson and ___ % per year for Henri. (e) Last year, Sheila turned down a job that paid $75,000 per year. This year, she accepted one that pays $81,000 per year. The salaries are equivalent at i = ____% per year.
The heat produced by a rectifier ____.
A. leads to a higher amperage in DC than AC B. reduces the power efficiency of the welding machine C. increases the power efficiency of the welding machine D. can be recycled in a heat sink to provide power to other machines
The most likely result of field design modifications to equipment is
A) Increased equipment life B) Improved performance and efficiency C) Reduced capacity and efficiency D) Lower operating cost
Under normal circumstances, the output from a(n) ________ does not equal its input
Fill in the blank(s) with correct word