Fundamental of Welding Science and Technology NPTEL ANSWERS : WEEK 7

Fundamental of Welding Science and Technology NPTEL ANSWERS : WEEK 7

THE ANSWERS ARE TAKEN FROM ONLINE SOURCES LIKE YOUTUBE VIDEOS AND GOOGLE SEARCH

1. In SMAW, it should be limited to weaves not exceeding

 1and1/2 times the diameter of the electrode

 2and1/2 times the diameter of the electrode

 3and1/2 times the diameter of the electrode

 4and1/2 times the diameter of the electrode

B

1 point

2. Rutile electrode contains high proportion of:

 Calcium carbonate

 Tungsten oxide

 Titanium oxide

 Calcium oxide

C

1 point

3. In oxy-fuel gas welding the acetylene gas shouldn’t be used at a pressure greater than:

 255 kPa

 155 kPa

 105 kPa

 55 kPa

C

1 point

4. Which of the chemical compounds form Basic electrodes?

 CaCO2 + CaF2

 C2H2 + CaCO3

 CaCO3 + CaF2

 C3H3 + CaCO3

C

1 point

5. Which type of electrode is most prone to H2 embrittlement?

 Rutile electrode

 Cellulosic electrode

 Basic electrode

 Metal powder electrode

 (NOT SURE)

1 point

6. The cylinder colour of Acetylene gas cylinder used in Oxy-Fuel gas welding is:

 Black

 Blue

 White

 Maroon

D

1 point

7. In SMAW, which type of electrode is preferable for either polarity & all positions?

 Rutile Electrode

 Cellulosic Electrode

 Metal Powder Electrode

 None of these

A

1 point

8. Between the neutral and oxidizing flame which one has the maximum peak temperature?

 Both have same

 Neutral flame

 Oxidizing flame

 None of these

C

1 point

9. In neutral flame the ratio of oxygen to acetylene is

 greater than 1.5

 greater than 1.0

 equal to 1.0

 equal to 1.5

C

1 point

10. In oxygen/acetylene welding, the oxygen uses for combustion in the first stage is supplied from

 the atmosphere

 the oxygen cylinder

 the C2H2 cylinder

 all the above

B

THE ANSWERS ARE TAKEN FROM ONLINE SOURCES LIKE YOUTUBE VIDEOS AND 

GOOGLE SEARCH