The minimum size of the bonding jumper from the building disconnecting means to the metal water pipe if the building is supplied by a 600 ampere feeder consisting of two 350- kcmil copper conductors in parallel is
A. 3/0 AWG copper.
B. 2/0 AWG copper.
C. 1/0 AWG copper.
D. 1 AWG copper.
D. 1 AWG copper.
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Assume an insulated vessel has a circumference of 62' (18.9 m) and a tan-tan height of 33'– 9" (10.3 m). There will be 8 sections per course with 3" (8 cm) overlaps at the seams. Estimate the total number of 48" (1.22 m) roll jacket sections needed to cover the sidewall.
a. 32 b. 48 c. 72 d. 96
Determine angle A in the accompanying figure. Express the answer to the nearest whole minute.
A. 35o 28' B. 36o 28' C. 36o 47' D. 38o28'
Footings, column pads, and other structural concrete frequently include ____ reinforcement.
A. titanium B. copper C. steel D. aluminum
Find a 95% confidence interval for the mean difference in time to freeze-up between the first month and the seventh.
A computer system administrator notices that computers running a particular operating system seem to freeze up more often as the installation of the operating system ages. She measures the time (in minutes) before freeze-up for seven computers one month after installation, and for nine computers seven months after installation. The results are as follows: One month after install: 207.4 233.1 215.9 235.1 225.6 244.4 245.3 Seven months after install: 84.3 53.2 127.3 201.3 174.2 246.2 149.4 156.4 103.3