A properly installed lap-seam metal roof compensates for the longitudinal movement of the roof panels by
_____.
a. slotting the panels so they can move on their fasteners
b. attaching the panels to purlins, which roll or bend to absorb the movement
c. using special fasteners that absorb the movement
d. flexing and bending the panels so no panel-to-panel movement occurs
b
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True isometric projections must be drawn using a special isometric scale that is two-thirds full size.
Answer the following statement true (T) or false (F)
The ozone layer filters out most of the suns harmful:
A) infrared radiation B) ultraviolet radiation C) gamma radiation D) alpha radiation
The fall-of-potential method is used to measure _____.
a. induced currents b. step voltage c. earth resistance d. touch voltage
A refrigerator using a 0.5 hp motor has a coefficient of performance of 3.05. 2 gallons of tea (model as water) is placed into the refrigerator at 80oF. How long will it take for the refrigerator to cool the tea to 40oF, assuming that this is the only heat load to be considered. Does this seem realistic? If not, what assumptions were made which make the calculation appear unrealistic?
Given: ?= 3.05; W?= -0.5 hp = 0.3534 Btu/s; Water: V= 2 gal = 0.2674 ft3; T1 = 80oF; T2 = 40oF Assume: The refrigerator is operating in a cyclic fashion. The water behaves as an incompressible substance with constant specific heats: c = 1 Btu/lbm-RSolution: What will be an ideal response?