問題一覧
1
Brazing material is made from:
copper , zinc and silver
2
The oxy-acetylene welding method can be used for welding ferrous or non-ferrous metals:
when welding ferrous metals , it is a necessary that an additional material to be used to assist in the fusion process
3
On completion of soldering a non-activated flux:
must be cleaned off with a selected solvent.
4
The shielding gases generally used in the Tungsten Gas (TIG) welding of aluminum consist of :
helium or argon or a mixture of helium and argon.
5
In Gas Tungsten Arc(GTA) welding a stream of inert gas is used to:
Prevent the formation of oxides in the puddle
6
Before using an electrical soldering iron, you should ensure that :
the tip is adequately tinned.
7
Hard soldering is done at temperatures :
in excess of 450 C0 and which include the processes of brazing and silver soldering.
8
The flux used during brazing is a mixture of water and :
borax powder.
9
What elements is solder made from :
tin and lead only.
10
When inspecting a welded joint, you should look for a bead width of :
3 to 5 times the base metal thickness.
11
What action is taken when soldering flux residue may have lodged in deep crevices of an assembly:
It must be immersed in a weak solution of caustic soda and rinsed thoroughly in running water.
12
Tensile is defined as:
Where the two surfaces are pulled directly apart
13
A flux , when used to facilitate soldering of electrical connections , may be:
solid stick type, paste type or liquid type.
14
When inspecting a weld, you should make sure that :
the parent (or basis) materials are fully fused together.
15
Silver soldering is suited for:
high temperature applications
16
Soft solder is suited for joints, which are:
subjected to small forces.
17
the type of to be used when soft soldering is applied:
active or passive group
18
A common method of fitting terminals to aircraft cables is by:
soft soldering.
19
A flux is used in soldering to:
to dissolve oxide.
20
Wicking is a procedure used for:
de-soldering