Question

1. a kind of welding filler metal, normally package in straight lengths, that does not conduct the welding current.

a. welding rod
c. tig wire
b. core wire
welding electrode

1. when preheating a thick or wide area of base metal, the most suitable fuel and oxygen combination is?

acetylene and oxygen
c. lpg and oxygen
b. methane gas and oxygen
d. natural gas and oxygen

1. which of the following test is used to check the external discontinuities of weld?

visual inspection
c. bend test
b. ultrasonic test
d. radiographic test

1. this kind of electrode needs to be stored in their original factory sealed container or an acceptable storage oven?

e7018
c. e7024
b. e6011
d. all the above

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

a. horizontal position
b. inclined position
upright position
d. upsleft position

1. in smaw, when the polarity is set to the dcen, it is also known as?

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 electric arc and cooled rapidly by quenching in water?

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

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

a. iron powder
low hydrogen
c. rutile
d. cellulosic

1. when deep penetration is required, which type of electrode flux covering is typically used?

a. iron powder
low hydrogen
c. rutile
d. cellulose

1. e7018 can be use in what welding positions?

Explanation:

Step1: Analyze question 6

A welding electrode is a welding filler metal, normally packaged in straight lengths and doesn't conduct the welding current. So the answer is d.

Step2: Analyze question 7

Acetylene and oxygen combination is most suitable for pre - heating a thick or wide area of base metal due to high flame temperature. So the answer is a.

Step3: Analyze question 8

Visual inspection is used to check the external discontinuities of weld. So the answer is a.

Step4: Analyze question 9

E7018 electrodes need to be stored in their original factory - sealed container or an acceptable storage oven. So the answer is a.

Step5: Analyze question 10

The most appropriate and proper position for storing acetylene cylinders is the upright position to prevent liquid acetone from flowing out. So the answer is c.

Step6: Analyze question 11

In SMAW, when the polarity is set to DCEN, it is also known as straight polarity. So the answer is a.

Step7: Analyze question 12

When a piece of mild steel is heated by electric arc and cooled rapidly by quenching in water, it will crack due to high thermal stress. So the answer is b.

Step8: Analyze question 13

Low - hydrogen powder needs drying before using to prevent hydrogen - induced cracking. So the answer is b.

Step9: Analyze question 14

When deep penetration is required, low - hydrogen electrode flux covering is typically used. So the answer is b.

Step10: Analyze question 15

E7018 can be used in all welding positions (flat, horizontal, vertical, overhead).

Answer:

1. d. Welding electrode
2. a. Acetylene and oxygen
3. a. Visual inspection
4. a. E7018
5. c. Upright position
6. a. Straight polarity
7. b. Crack
8. b. Low hydrogen
9. b. Low hydrogen
10. All welding positions (flat, horizontal, vertical, overhead)