2nd

Semester, 3rd Periodical Examination

Quetegan National High School
Quetegan Mangatarem Pangasinan

Name ____________________________________ YR& SEC________________ Score ________________

Multiple choice: Encircle the correct choices.
1. Which term describes the voltage output of the machine while welding is being done?
a) arc rectification b) arc blow c) arc voltage d) inductance
2. Electrode negative is:
a) straight polarity. b) reverse polarity. c) AC transformer. d) alternating current.
3. Which term describes a noisy, uncontrollable arc that flares from side to side?
a) arc voltage b) arc blow c) inductance d) resistance
4. Which current flows in one direction only and has either a positive or negative value?
a) direct current b) alternating current c) open circuit voltage d) arc voltage
5. Which term expresses the strength of a current of electricity?
a) amperage b) voltage c) electron d) conductor
6. When no current is flowing in the circuit, but the machine is turned on, you can measure the:
a) constant current. b) open circuit voltage. c) alternating current. d) volt-amp curve.
7. Which term describes the property of an electrical conductor that opposes the flow of current?
a) resistance b) inductance c) voltage d) amperage
8. Which welding machine transforms AC to DC?
a) line transformer b) transformer rectifier c) DC generator d) AC transformer
9. Electrode positive means:
a) straight polarity. b) reverse polarity. c) AC transformer. d) alternating current.
10. How can you change the polarity on an AC generator welding machine?
a) Switch the cables at the machine. b) Reverse the direction of the motor.
c) Change the polarity taps on the reactor coils. d) An AC generator has no fixed polarity.
11. Loose ground clamp connections, when using SMAW, may cause:
a) electrical shock. b) magnetic arc blow. c) high burn-off rates. d) arcing at the work clamp.
12. Dynamically loaded structures are subject to:
a) constant pressure. b) reversals of stress. c) loads that do not impact. d) stationary loading conditions.
13. In the AWS classification for SMAW mild steel electrodes, what does the last digit represent?
a) The type of shielding gas produced by the melting flux. b) The amount of metallic powder that is added to the coating.
c) The welding position in which the electrode may be satisfactorily operated.
d) The major ingredient in the coating and recommended current for best results.
14. What do the first two digits in the AWS classification for carbon steel SMAW electrodes represent?
a) current type and application b) as-welded minimum tensile strength
c) recommended welding positions d) iron powder content of the coating in %
15. According to AWS, which number indicates the positions an E7024 can be used in?
a) first number b) second number c) third number d) fourth number
16. The CSA system uses what term to measure tensile strength?
a) kilopascals b) joules per square metre c) megapascals d) watts per square metre
17. What is the difference between an E7018 and an E7028 electrode?
a) E7018 has a lime-type coating; E7028 does not. b) E7018 can be used in all positions; E7028 cannot.
c) E7018 has metallic powder in the coating; E7028 does not. d) E7018 is for static loading; E7028 is for dynamic loading.
18. What is one difference between an E7010 electrode and an E7018 electrode?
a) core wire b) minimum as-welded tensile strength c) coating d) recommended welding positions
19. What is one characteristic of an E6010 electrode?
a) deep penetration into the base metal b) produces a low hydrogen type weld deposit
c) shallow penetration into the base metal d) wide metal flow and very fluid puddle
20. What is the major difference between the coatings of an E41010 and an E41011 electrode?
a) There is no difference. b) An E41010 requires moisture but an E41011 does not.
c) An E41010 has arc stabilizers added for AC welding. d) An E41011 has arc stabilizers added for AC welding.
21. Which electrode has a cellulose coating?
a) E6010 b) E6013 c) E7014 (E48014) d) E7018
22. What is one purpose of the flux coating on a welding electrode?
a) To promote the formation of oxides and nitrides in the weld puddle. b) To prevent undercut and arc blow and minimize distortion.
c) To prevent the formation of a gaseous shield around the molten weld metal.
d) To protect the molten weld puddle from atmospheric contamination.
23. Which last digit, in the classification of a SMAW mild steel electrode, describes a coating that is low-hydrogen?
a) 0 b) 1 c) 4 d) 8
24. What is one function of the slag produced from electrode coatings?
a) To add more nitrogen and oxygen to the weld. b) To help maintain the arc and control penetration.
c) To add alloying elements to the weld deposit. d) To prevent the weld from cooling too rapidly.
25. What is the likely effect of using low hydrogen electrodes with a moisture content that exceeds acceptable limits?
a) The weld metal will probably have porosity and may develop hydrogeninduced cracking.
 b) The slag produced will be difficult to remove, resulting in slag inclusions on subsequent passes.
c) The excess steam rising out of the protective gaseous shield will make it hard to see the puddle.
d) The deposited weld metal will look too much like the deposit of a cellulosecoated electrode.
26. What is the main purpose for keeping low hydrogen electrodes dry?
a) To assist in producing and maintaining a stable, smooth arc. b) To minimize the possibility of hydrogen-induced cracking.
c) To increase the electrode's deposition rate. d) To increase the shelf life of the electrodes in storage.
27. To weld thin materials, you would likely select an electrode with:
a) deep penetration characteristics. b) a large diameter core wire.
c) a small diameter core wire. d) a high as-welded tensile strength.
28. Which electrode works best for the root bead on groove welds with an open gap?
a) E41013 b) E48028 c) E41010 d) E48024
29. What is the major advantage of using an E41010 for the root bead and E48018 electrodes for fill passes on one welded joint?
a) The company can save money on the cost of electrodes because E41010 electrodes are cheaper.
b) It is easier on the welding machine if the amperage changes periodically and E41010 electrodes use lower amperages.
c) It takes advantage of the penetration qualities of the E41010 and the mechanical properties of the E48018.
d) It will determine if welders can follow specific procedures before they attempt the B pressure test.
30. Which electrode would be the best choice if the base metal properties were unknown?
a) E7018 b) E7014 (E48014) c) E6011 d) E7024
31. Electrode angle is:
a) determined by the weld size. b) the amount the electrode is tipped forehand or backhand.
c) normally one half of the angle of the joint. d) the variable that determines bead contour.
32. What are two commonly used methods for striking the arc with SMAW?
a) amperage surge method and long arc method b) dead short method and manipulative method
c) tapping method and scratch method d) lift start method and polarity method
33. Excessive current settings for SMAW are indicated by:
a) lack of penetration. b) excessive spatter. c) very smooth bead appearance. d) a high-crowned bead.
34. A normal arc length is considered to be equivalent to the:
a) diameter of the core wire of the electrode. b) diameter of the electrode including the flux coating.
c) length of the electrode. d) length of weld bead.
35. What is the best method for determining the current setting for an electrode?
a) Follow the directions on the electrode container.
b) Set the current according to the manufacturers' recommendations and then test on a piece of scrap of approximately the same
thickness as that being used for the weld project.
c) Have your supervisor adjust the controls to correspond to the welding procedure.
d) Just listen to the way the electrode burns until it sounds about right.
36. When you deliberately shorten the arc length, what are you expecting to achieve?
a) a wider bead with less penetration b) deeper penetration with a decrease in puddle fluidity
c) increased puddle fluidity and a slower burn-off rate d) increased burn-off rate and increased puddle fluidity

II Identification write the correct answer on the space provided after the question.

What arc length gives the: a) best blend into the edges of a weld bead? __________________________ b) deepest penetration?
__________________________ c) highest rate of metal deposit? __________________________ d) widest bead?
__________________________
What polarity is recommended for: a) E41010 _____________________________ b) E48018

III Application: Explain the following instances as you experience in welding process
When the arc length is increased during welding, what happens to penetration?
____________________________________________________________________
When the arc length is increased during welding, what happens to puddle fluidity?
____________________________________________________________________

Prepared by:
Michael John S Agustin
SMAW-TEACHER
Checked By:
Alendra A. Biado
Principal I
Noted by:
Teresita R. Degracia Phd.
Public Schools District Supervisor