Quiz — Double Jointing Key: Application and Use

1. What is the main purpose of a double jointing key? *

To trace only the head angle

To verify stave dressing and angles at head and bilge

To calculate the barrel volume

To adjust stave thickness

2. What does the diameter of a circle measure? *

The total surface area

The distance between two opposite points passing through the center

Half the perimeter

The interior volume

3. To find the perimeter of a circle, the formula used is: *

P = 2R

P = R ÷ 2

P = πD

P = π²D

4. In the given example, what is the bilge radius for a 225L barrel? *

28.5 cm

69 cm

34.5 cm

57 cm

5. Why is the double key more precise than a single key? *

Because it uses metal

Because it controls both the bilge and the head

Because it is larger

Because it is manufactured mechanically

6. When in use, where must the stave be aligned on the jointing key? *

On the outer edge

On the end of the board

On the central axis of the key

On the bilge arc only

7. What is a disadvantage of the double key compared to the single key? *

Less precision

It breaks more easily

Longer and more complex tracing

It is less readable

8. If the stave corresponds to number 9 on the head arc, it must correspond on the bilge arc to: *

Number 7

Number 11

Number 9 as well

Number 13

9. Why is it important to always use the central axis as a reference? *

To trace faster

To visually center the wood

To guarantee the regularity of the jointing

To avoid using a compass

10. On a double key, how are the two circular arcs (head and bilge) positioned? *

They are drawn with the same center for simplicity

They are concentric to follow the same curvature

They are drawn with two centers slightly offset on the axis

They each start from one edge of the board to save space