1.
Which of the following is not true?
A
Soft solder – lead-37%, tin-63%
B
Medium solder – lead-50%, tin-50%
C
Electrician solder – lead-64%, tin-36%
D
Plumber's solder – lead-70%, tin-30%
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Which of the following is not true?
Soft solder – lead-37%, tin-63%
Medium solder – lead-50%, tin-50%
Electrician solder – lead-64%, tin-36%
Plumber's solder – lead-70%, tin-30%
The composition of electrician solder is
lead-37%, tin-63%
lead-50%, tin-50%
lead-63%, tin-37%
lead-70%, tin-30%
The composition of soft solder is
lead-37%, tin-63%
lead-50%, tin-50%
lead-63%, tin-37%
lead-70%, tin-30%
In soldering the melting point of filler metal is
below 420°C
above 420°C
below 520°C
above 520°C
The commonly used flux in brazing is
Borax
Rosin
Lead sulphide
Zinc chloride
The filler metal used in brazing has melting point of above
200°C
300°C
420°C
520°C
A braze joint may be satisfactorily used on components made of.......
Tinplate
Brass
Copper
Aluminium
Spelter is same as......
Tin
Zinc
Lead
Silver
Heat for soldering process is supplied by.........
Soldering iron
Induction furnace
Electric resistance method
Any of the above
The commonly used flux for brazing is.......
Resin
NH4CL
Borax
Soft iron
The purpose of using borax in brazing is to......
Replace flux
Dissolve oxides when heating the work
Accelerate the formation of oxides on the work
Prevent the spelter from melting too quickly
Entrapped fluxes, during brazing result in.......
Presence of gas pockets
Corrosion
Cracking
Distortion of joints
The flux is brazing process is used in the form of.......
Powder
Liquid
Paste
Any of the above
Which of the following flux is used for brazing aluminium and magnesium.......
Mixture of boric acid,borax and wetting agent
Boric acid,borax or fluoride with a wetting agent
Chlorides and fluorides mixed with water
Any of the above
Brazing is the process of.......
Joining plastic sheets
Hard soldering using brass spelter
Casing in brass
Makeing steel look like brass
The purpose of using flux in soldering is to.......
Increase fluidity of solder metal
Feel up gaps left in a bad joint
Carbon steel
Prevent oxides forming
A soldering iron bit is made of.......
Brass
Tin
Steel
Copper
Soldering iron is made of wedge shape in order to......
Apply high pressure at edge
Retain heat
Retain solder
Forge welding
When brazing is carried out.........
A joint is made between two parts by molten spelter
The edges of the joint melt and run together
Spelter forms an alloy with the flux
Flux prevents the work from melting
The temperature range for soldering process is.......
40°C to 100°C
180°C to 250°C
300°C to 500°C
600°C to 900°C