cap 10 Materiales Flashcards
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- Surface treatments and coatings are applied to a number of products for reasons that can include all but which of the following?
a. Corrosion resistance.
b. Uniformity of appearance.
c. Sanding and grinding.
d. Improving physical properties.
c. Sanding and grinding.
- Hardening the surface of a product is referred to as:
a. partial hardening.
b. case hardening.
c. exterior hardening.
d. surface hardening.
b. case hardening.
- The depth of case hardening can be physically measured by destructive methods, such as cutting the test object, etching the cut surface, and checking the cut depth with a measuring microscope. A faster and more useful method when knowledge is needed directly for service parts is:
a. ultrasonic testing.
b. electromagnetic testing.
c. radiographic testing.
d. magnetic particle testing.
b. electromagnetic testing.
- One of the more common methods used to case harden steel is:
a. quenching.
b. tempering.
c. annealing.
d. carburizing.
d. carburizing.
- The complete heating cycle for case hardening by carburizing includes the addition of carbon at the surface (carburizing), hardening, and:
a. tempering.
b. quenching.
c. annealing.
d. normalizing.
a. tempering.
- The molten cyanide method of case hardening is usually limited to case depths of approximately:
a. 25 mm (1.00 in.).
b. 2.5 mm {0.1 in.).
c. 0.25 mm (0.010 in.).
d. 0.025 mm (0.001in.).
c. 0.25 mm (0.010 in.)
- A case hardening process that does not require a change of composition in the surface material is the:
a. pack hardening method.
b. sodium cyanide method.
c. gaseous hydrocarbon method.
d. flame hardening method.
d. flame hardening method.
- Chemical cleaning processes include all but which of the following methods?
a. Vapor bath.
b. Burnishing .
c. Spraying.
d. Dipping.
b. Burnishing .
- Mechanical cleaning processes include all but which of the following methods?
a. Tumbling.
b. Vibration.
c. Spraying.
d. Buffing.
c. Spraying.
- By adding sulfuric acid in concentrations from 10 to 25% and increasing the temperature to approximately 65°C (149°F), the removal of surface oxides and scale from iron and steel is possible in a process known as:
a. acid cleaning.
b. pickling.
c. brining.
d. acid etching.
b. pickling.
- Most common cleaners are made up of approximately_________water and some other chemical such as caustic soda, sodium carbonate, phosphates, and so on.
a. 50%
b. 80%
c. 95%
d. 98’%
c. 95%
- When cleaning agents such as sand, steel grit, or shot are directed by high velocity air, water, or other mechanical means, this process is known as:
a. spraying.
b. blasting.
c. surfactant cleaning.
d. pressure washing.
b. blasting.
- Water slurries containing rust-inhibiting chemicals may carry, in suspension, fine abrasive particles that provide a grinding cutting-type action for finish improvement along with cleaning in a method commonly known as:
a. sand blasting.
b. shot peening.
c. abrasive blasting.
d. liquid honing.
d. liquid honing
- Metal spraying, or metalizing, is a process in which metal wire or powder is fed into an oxyacetylene heating flame and then, after melting, is carried by high velocity air to the work surface. The bond between the metal droplets and the work surface is mostly:
a. mechanical.
b. atomic.
c. ionic.
d. covalent.
a. mechanical.
- Many objects are coated with a thin, 0.025 mm
(0.001 in.) layer of metal as protection against corrosion, to improve appearance, or to add material for a dimensional increase, using a complex electrical and chemical setup in a process known as:
a. chroming.
b. cathodization.
c. electroplating.
d. tinning.
c. electroplating.
