When rigging a load, the center of gravity must be _____.
a. at least six inches above the hook
b. at least one inch above the hook
c. even with the hook
d. below the hook
Answer: D
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A geothermal well costs $1,485 to drill. Casing for the well costs $162. Tubing put into the well costs $179. What is the cost of this entire system??
Fill in the blank(s) with the appropriate word(s).
The NEC® requires motor disconnecting means be _____.
a. 8 feet or more above the floor b. within sight of the controller location c. guarded d. installed so access is limited to qualified persons
The optimum sling angles are between _____.
a. 20 and 10 degrees to the horizontal plane b. 35 and 25 degrees to the horizontal plane c. 60 and 45 degrees to the horizontal plane d. 75 and 60 degrees to the horizontal plane
Five-hundred moles per minute of liquid benzene (300 K and 3.0 bar) enters a steady state heater. The benzene leaves the heater as a superheated vapor (450 K and 3.0 bar). What rate of heat addition is needed to achieve this change? Assume the heat of vaporization is not a function of pressure. Note: The vapor pressure of benzene is given by the following relationship:
lnPsat = 13.8594 – 2773.78/(T-53) where P [=] kPa and T [=] K