All of the following are types of geometrical stairs except ____
A) circular
B) elliptical
C) double-L
D) spiral
Answer: C
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In a split-system air-to-air heat pump, the coil that absorbs heat in the heating mode is referred to as the _____.
a. outdoor coil b. indoor coil c. heating coil d. heat sink
A 200-ft-long section of a steam pipe whose outer diameter is 4 in passes through an open space at 50°F. The average temperature of the outer surface of the pipe is measured to be 280°F, and the average heat transfer coefficient on that surface is determined to be 6?Btu/h•ft2•°F. Determine (a) the rate of heat loss from the steam pipe and (b) the annual cost of this energy loss if steam is generated in a natural gas furnace having an efficiency of 86 percent and the price of natural gas is $1.10/therm (1 therm = 100,000 Btu).
What will be an ideal response?
Name the temperature ranges (°F) associated with these heating media:
A. Low temperature hot water B. Medium temperature hot water C. High temperature hot water
Using the following information, determine the ownership and operating costs for a hydraulic excavator.
Actual cost (delivered)—$172,600 Horsepower rating—245 hp Salvage value—$17,200 Useful life—8 years at 1,600 hours per year Total interest—6.5 percent per year Insurance—$2,589 per year Taxes—$3,020 per year Storage—$2,157 per year Fuel cost—$3.65 per gallon Fuel consumption rate—0.04 gallons per hp per hour Power utilization—60 percent Use factor—50 minutes per hour (83.33 percent) Lubrication—7 quarts of oil at $4.65 per quart Oiler labor—2.9 hours at $31.27 Lubrication schedule—every 150 hours Oil filter—$10.95 Grease—1 tube per 8 hour shift at $8.50 Air filter—$22.50 changed every 450 hours Repairs to equipment—75 percent over useful life