Explain the chemistry of a cut.
What will be an ideal response?
The burning away of the metal is a chemical reaction with iron (Fe) and oxygen (O). The oxygen forms an iron oxide, primarily Fe3O4, that is light gray in color. Heat is produced by the metal as it burns. This heat helps carry the cut along. On thick pieces of metal, once a small spot starts burning (being cut), the heat generated helps the cut continue quickly through the metal.
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The word "metric" is derived from the Greek word "metron," meaning measure.
Answer the following statement true (T) or false (F)
You are checking a boosted diesel air intake system for inlet restriction using a negative pressure gauge. Which of the following would be the typical maximum acceptable spec reading on the gauge?
A. 10 inches Hg restriction B. 25 inches Hg restriction C. 10 inches H2O restriction D. 25 inches H2O restriction
Due to the absence of any moving electrical contacts, which type of motor should be used where the motor is
exposed to flammable dust or gas? a. AC motor b. Shunt motor c. Squirrel cage induction motor d. Two loop DC motor AGRICULTURAL MECHANICS AND METAL TECHNOLOGIES - TX. ED., VOL. 1 MODULE 26202-14 EXAM 5 Copyright © 2017 NCCER. Permission is granted to reproduce this page provided that copies are for local use only and that each copy contains this notice.
If the STOP button were open, the motor would ____.
A. have an energized forward contactor B. have a de-energized reverse contactor C. run in the forward direction D. not run in the forward direction