Heat pump defrost is necessary in which mode of operation?
A. heating
B. cooling
C. either a or b
D. Defrost is never necessary for a heat pump system.
Answer: A
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When installing nonmetallic-sheathed cable through wood wall studs and floor joists, the cable must be installed at least ____ inch(es) from the nearest edge.
A. 1/2 B. 3/4 C. 1 D. 1 1/4
Refer to Exercise 14. Assume that l = 10.0 cm ± 0.5% and d = 10.4 cm ± 0.5%.
a. Estimate R, and find the relative uncertainty in the estimate. Does the relative uncertainty depend on k? b. Assume that either l or d can be re-measured with relative uncertainty 0.2%. Which should be remeasured to provide the greater improvement in the relative uncertainty of the resistance?
Any piece of equipment supported by a hydraulic system should:
a. be safe to work under if there are no leaks b. be safe to work under if the oil is cold c. be secured mechanically before work is done on it d. safe to work under