A single start worm drive has a ratio of 48:1 . A double start worm with the same worm
gear would have a ratio of:
A. 96:1
B. 48:1
C. 36:1
D. 24:1
D
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The horizontal blocking in wood studs helps prevent
A) compressive failure of studs. B) buckling of studs. C) shear failure of studs. D) tensile failure of studs.
Ungrounded electrical systems with conductors installed in grounded metal raceways and enclosures
A. have no voltage to ground. B. have an approximate half system voltage to ground. C. present no shock hazard to personnel. D. cannot become grounded as there is no connection to the ground rod.
Which are good reasons to place chillers in the basement rather than the top floor of a high-rise? Select all that apply.
A) Vibration is less problematic. B) Earlier start for construction of the major mechanical room. C) Height of piping above the chillers ensures good pressure. D) Easier access for maintenance supplies.
Galvanizing and plating are familiar uses of zinc, lead and tin. On what base material are these metals plated and what do they resist?
A) On pipe joints to resist leaking B) On babbitt bearings to resist wear C) On steel to resist corrosion D) On die castings to resist deformation