?Describe the shielded metal arc welding (SMAW) process.
What will be an ideal response?
?Shielded metal arc welding (SMAW) uses a 14-in. (355.6-mm) -long consumable stick electrode that conducts the welding current from the electrode holder to the work, and as the arc melts the end of the electrode away, it becomes part of the weld metal. The welding arc vaporizes the solid flux that covers the electrode so that it forms an expanding gaseous cloud to protect the molten weld metal. In addition to fluxes protecting molten weld metal, they also perform a number of beneficial functions for the weld, depending on the type of electrode being used.
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Which term describes current flow produced in a complete circuit when a magnetic field is moved back and forth across the circuit path?
A) Magnetic potential B) Electromagnetic reluctance C) Electromagnetic induction D) None of these
What is an absolute temperature scale?
A) A temperature scale that uses sensitive wireless sensors to detect the vibrational frequency of the molecules in a substance to determine its temperature to a high degree of accuracy B) A temperature scale with no negative temperatures and 0° equal to absolute zero C) A thermometer that has been NIST calibrated to be absolutely correct D) A theoretical temperature scale that only applies to quantum physics
____________________ is the amount of carbon left in a sample of oil after it is vaporized, changed from a liquid to a vapor, by boiling it.
Fill in the blank(s) with the appropriate word(s).
The signal x [n] is defined in Figure E.14. Let y [n] be the first backward difference of x [n] and let z [n] be the accumulation of x [n] . (Assume that x [n] is zero for all n < 0).
(a) What is the value of y [4] ?
(b) What is the value of z [6] ?