1) In the process of soldering, you have noticed solder not sticking to sufficiently heated copper soldering bit when rubbed over solder bar. What step do you take to overcome the problem? *

 

Clean the bit thoroughly

Rub the bit over solder for longer period

Preheat the solder

Change the soldering bit shape

 

Correct Answer (A)

 

2) Which one of the following statements is correct? .

 

Soldering is used to join surfaces not under high-strength forces

The filler metal (solder) melts at temperature higher than 427°C

Most soft solders are alloys of tin and Copper

Solder has relatively high tensile strength

 

Correct Answer (A)

 

 

3) Solders with a tin content of ………………. or more are classified as fine solders and are used in soldering instruments where temperatures are critical.

 

30%

40%

50%

60%

 

Correct Answer (D)

 

 

4) Special solders are used for specific purposes. Which solder is used to solder food handling vessels?

 

Lead and tin

Copper and zinc

Tin and antimony

Silver and copper

 

Correct Answer (C)

 

 

5) For soldering which one of the following metals, zinc chloride is NOT used as flux?

 

Brass

Steel

Tin

Lead

 

Correct Answer (D)

 

 

6) A soldering bit consists of a piece of …………………….fastened to an iron rod with a wooden handle.

 

Copper

Lead

Tin

Zinc

 

Correct Answer (A)

 

 

7) This is a soldering process in which two surfaces are soldered together without allowing the solder to be seen. What is this process called?

 

Sweat soldering

Seam soldering

Wet soldering

Hem soldering

 

Correct Answer (A)

 

 

8) As a safety precaution you should avoid touching your face while working with solder, because most solders contain

 

Lead

Aluminium

Antimony

Copper

 

Correct Answer (A)

 

 

9) The composition of soft solder is …………………

 

lead-37%, tin-63%

lead-50%, tin-50%

lead-63%, tin-37%

lead-70%, tin-30%

 

Correct Answer (A)

Related Posts

Leave a Reply

Your email address will not be published.