CBJ Core Knowledge and Fundamentals 3

Question 1

What is the correct torch tip choice when soldering delicate fine silver wire components?

Accepted Answer

Small fine tip for pinpoint heat control

Answer

A small, fine-tipped torch allows precise heat application to delicate wire without overheating surrounding areas or melting fine details.

Question 2

In the context of precious metal alloys, what does 'fineness' refer to?

Accepted Answer

The parts per thousand of pure metal in an alloy

Answer

Fineness expresses the purity of a precious metal alloy in parts per thousand — for example, 750 fineness equals 18-karat gold (75% pure).

Question 3

Why is pickle solution used after soldering a jewelry piece?

Accepted Answer

To remove flux residue and oxidation

Answer

Pickle is a mild acid solution that dissolves flux residue and the oxides that form on metal surfaces during soldering.

Question 4

What is the term for the temperature at which a solder alloy begins to melt?

Accepted Answer

Solidus temperature

Answer

The solidus temperature is the point at which a solder alloy begins to melt; the liquidus is when it is fully liquid — together they define the melting range.

Question 5

A bench jeweler is sizing a ring larger using a ring stretcher. Which metal property makes this possible?

Accepted Answer

Malleability

Answer

Malleability is the property that allows metal to be permanently deformed by compressive forces (like a stretcher) without fracturing.

(CBJ) Certified Bench Jeweler Practice Test

(CBJ) Certified Bench Jeweler Practice Test

CBJ Core Knowledge and Fundamentals 3