Exam (elaborations)
CWB level 3 module 20 QUESTIONS AND ANSWERS RATED A+ 2024/2025
- Course
- Institution
CWB level 3 module 20 QUESTIONS AND ANSWERS RATED A+ 2024/2025
[Show more]
Content preview
CWB level 3 module 20Compared to non metals, metals have - ANS1. High electric conductivity
2. High thermal conductivity
3. High particular gravity
4. Often ductile and may be fashioned
five. Metallic's bodily houses may be substantially motivated with the aid of it is alloying
materials.
In metals, electric and thermal conductivity .. - ANSParalell every different
Cu and Al are used as .. - ANSelectrical conductors
Gold and silver are used as .. - ANSelectrical contacts
Electrical conductivity helps for .. - ANSarc welding and resistance welding
Very excessive thermal conductivity makes .. - ANSarc welding tough and resistance welding
impossible bcz warmth is hastily eliminated from weld
Thermal conductivity of Cu - ANS394 W(m c) / 230 BTU
Electrical resistivity of Cu - ANS1.Seventy two x 10 ^ -8 ohm m
Thermal conductivity of Aluminum - ANS222 W(m c) /130 BTU
Electrical resistivity of Al - ANS2.83 x 10 ^ -eight ohm m
Thermal conductivity of Carbon metal - ANS46 W(m c) /26.8 BTU
Electrical resistivity of Carbon steel - ANS16.0 x 10 ^ -8 ohm m
Pure Cu - ANSCannot be seam / spot/ projection welded
Al - ANSCannot be spot / seam welded in skinny sections. High currents required
Carbon metal.. - ANSEasily welded by all resistance welding methods
Two ores of iron - ANSMagnetite (Fe3 O4) & Hematite ( Fe2O3)
Ore of Al - ANSBauxite ( Al2 O3)
, Iron is extracted with the aid of - ANSsmelting in a blast furnace by using blowing warm air over
coke to produce carbon monoxide, which removes O2 from the ore, leaving the iron as a liquid
metallic.
Al from Bauxite can not be extracted with the aid of.. - ANSheating method
Bauxite is extracted by . - ANSelectrical method
Plot of loose energy of oxides - ANSEllingham diagram
Large unfastened energy suggests a - ANSvery strong oxide
Gold ore is stable at - ANSroom temperature and doesn't corrode
Most of the metals are handiest strong at - ANShigh temperatures and a reducing agent is used
to lower O2 capability
Rate of oxidation increases with.. - ANSincrease in temp.
Stability of oxide decreases with .. - ANSincrease in temp.
Gold may be - ANScold welded
diploma of safety required while welding will depend on - ANSreactivity of metals .,ie, price of
oxidation and the stableness of oxide.
Lead can be fusion welded with - ANSno sheilding
Melting temp of lead - ANS327 C
Shielding required for lead - ANSMinimal, gas flame is ok
Melting temp of Cu - ANS1083 C
Shielding required for Cu - ANSFlux or inert fuel
Melting temp of Al - ANS660 C
Shielding required for Al - ANSInert fuel is preffered
Melting temp of Steel - ANS1350 C
Shielding required for Steel - ANSFlux, inert gasoline or CO2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller LegitPage. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now