Question

or an acceptable storage oven?
a. e7018 c. e7024
b. e6011 d. all the above

1. the most appropriate and proper position for storing acetylene cylin

a. horizontal position
b. inclined position
c. upright position
d. upleft position
11 in smaw, when the polarity is set to the dcen, it is also known as
a. straight polarity c. dc polarity
b. reverse polarity d. ac polarity

1. what will happen when a piece of mild steel is heated by means of e and cooled rapidly by quenching in water?

a. no significant changes will happen. c. crack
b. expand d. elongate

1. it is a kind of electrode that needs drying before using?

Explanation:

1. Answer for question 10:

• c. Upright position

1. Answer for question 11:

• a. Straight polarity

1. Answer for question 12:

• c. Crack

• Question 10: Acetylene cylinders are most safely stored in an upright position to prevent the migration of the acetone (used as a solvent for acetylene) which can cause dangerous conditions if the cylinder is used in an improper - stored state.
• Question 11: In Shielded Metal Arc Welding (SMAW), when the polarity is set to DCEN (Direct Current Electrode Negative), it is also known as straight polarity. In DCEN, the electrode is negative and the workpiece is positive.
• Question 12: When mild steel is heated and cooled rapidly by quenching in water, high internal stresses are generated due to the large temperature gradient. These stresses can cause the metal to crack.

Answer:

• Question 10: Acetylene cylinders are most safely stored in an upright position to prevent the migration of the acetone (used as a solvent for acetylene) which can cause dangerous conditions if the cylinder is used in an improper - stored state.
• Question 11: In Shielded Metal Arc Welding (SMAW), when the polarity is set to DCEN (Direct Current Electrode Negative), it is also known as straight polarity. In DCEN, the electrode is negative and the workpiece is positive.
• Question 12: When mild steel is heated and cooled rapidly by quenching in water, high internal stresses are generated due to the large temperature gradient. These stresses can cause the metal to crack.