Identify what the function of the economizer section is.
What will be an ideal response?
The economizer section is used to increase boiler efficiency by preheating the water as it enters the system. This section is a series of headers and tubes located between the firebox and the stack. Temperatures are typically lower in the economizer section than in the rest of the system, but the hot flue gases moving out of the firebox and into the stack still have enough heat to offset energy costs. The economizer section in a boiler is very similar to the convection section in a fired heater systems. Both operate under the energy-saving concept of using the hot flue gases before they are lost out the stack.
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Mobile cranes are most commonly mounted on crawlers or _____.
a. railcars b. boats c. trucks d. barges
Which of the following explains why piezo actuators respond faster to injector driver signals than equivalent solenoid actuators
A. lighter in weight B. mechanical movement takes place without having to build a magnetic field C. they use data bus driven signals D. respond to wireless driver inputs
The area where all living and nonliving features depend on each other is called the _____
a. farm c. canopy b. ecosystem d. sublayer
Claris Water Company makes and sells filters for water drinking fountains for the public. The filter sells for $50. Recently a make/buy analysis was done based on the need for new manufacturing equipment. The equipment first cost of $200,000 and $25,000 annual operation cost comprise the fixed cost, while Claris’s variable cost is $20 per filter. The equipment has a 5-year life, no salvage value, and the MARR is 6% per year. The decision to make the filter was based on the breakeven point and the historical sales level of 5000 filters per year.
(a) Determine the breakeven point. (b) An engineer at Claris learned that an outsourcing firm offered to make the filters for $30 each, but this offer was rejected by the president as entirely too expensive. Perform the breakeven analysis of the two options and determine if the “make” decision was correct. (c) Develop and use the profit relations for both options to verify the preceding answers. (d) Use a spreadsheet to verify the answers to parts (b) and (c) above by plotting the profit lines.