The welding torch is held in place for a short time after a weld bead is terminated to allow _____
a. the post-flow of shielding gas to protect the weld, electrode, and filler metal
b. the tungsten electrode to oxidize
c. the torch cooling water to also cool the weld
d. weld puddle to remain fluid as long as possible
a
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The ____________________ of a pyramid is the perpendicular segment from the vertex to the plane of the base.
Fill in the blank(s) with the appropriate word(s).
For the following five spreadsheet functions, (a) write the values of the engineering economy symbols P, F, A, i, and n, using a ? for the symbol that is to be determined, and (b) state whether the displayed answer will have a positive sign, a negative sign, or it can’t be determined from the entries.
(1) = FV(8%, 10, 3000, 8000) (2) = PMT(12%, 20, –16000) (3) = PV(9%, 15, 1000,600) (4) = NPER(10%, –290,, 12000) (5) = FV(5%, 5, 500, –2000)
What type of electrical current does a fuel cell generate?
A) Alternating current B) Direct current C) Both A and B D) Neither A nor B
How do refillable and recovery cylinders differ?
A) The size of the cylinder B) The color of the cylinder C) The shape of the cylinder D) The material in the cylinder