The document contains multiple choice questions related to various manufacturing processes, specifically focusing on welding techniques and standards. It covers topics such as definitions of welding terms, characteristics of flames, types of welding processes, and the properties of different gases used in welding. The questions include correct answers and address concepts like welding arc, shielding gas, and welding equipment.

1. MULTIPLE CHOICE
QUESTIONS
MANUFACTURING PROCESSES

2. 1. In which standard is the term ‘Metal Welding’ defined ?
Options:
a. EN 14610
b. EN 1090-2
c. EN 4711-1
d. EN 12345
e. EN 190-1
Correct Answer:
a. EN 14610

3. 2. How do you recognize a flame that has acetylene surplus?
Options:
a. The flame is clear and has sharp outlines
b. The flame cone is yellowish white
c. The flame cone is sharply separated from
the external stream
d. The flame core is slightly purple
e. The mixture ratios of the acetylene and
oxygen range from 1:1 to 1:2
Correct Answer:
b. The flame cone is yellowish white

4. 3. Which of the following statement is correct concerning welding indexes?
Options:
a. All arc welding processes start with the index 3
b. All arc welding processes start with the index 1
c. All gas shielded metal arc welding processes
start with the index 13
d. All submerged arc welding processes start with
the index 14
e. Both b and c
Correct Answer:
e. Both b and c

5. 4. By which letter the resistance welding processes are defined?
Options:
a. R, RA
b. W, RP
c. WS
d. RP
e. a and d
Correct Answer:
e. a and d

6. 5. Which of the following welding processes are part of fusion welding processes?
Options:
a. Gas welding
b. Friction Welding
c. Manual arc welding
d. Hammer welding
e. a, and c
Correct Answer:
e. a and c

7. 6. The arc is an energy carrier used for the following processes
Options:
a. TIG welding
b. Seam welding
c. Resistance welding
d. Metal arc welding
e. a and d
Correct Answer:
e. a and d

8. 7. Common example of pressure welding processes are
Options:
a. Spot welding
b. Projection welding
c. Hammer welding
d. Friction welding
e. All of the above
Correct Answer:
e. All of the above

9. 8. Which of the following welding processes are part of the autogenous techniques?
Options:
a. PAW without filler
b. TIG with tungsten electrode and without
filler
c. Plasma arc spraying
d. TIG with tungsten electrode and filler
e. a and b
Correct Answer:
e. All of the above

10. 9. Which of the following statements concerning the fuel gas acetylene correct?
Options:
a. Acetylene is the most used fuel gas in the autogenous
techniques
b. The molecule acetylene easily falls apart into carbon
and oxygen
c. It is stored in specially equipped cylinders. These
cylinders contains a porous filling mass in order to
avoid possible falling apart of the gas
d. The acetylene regulator back pressure should not
exceed 1.5 bar
e. a , c and d
Correct Answer:
e. a , c and d

11. 10. Which statement concerning to the fuel gas C2H2 is correct?
Options:
a. It is heavier than the air
b. The fuel gas has the lowest combustion
temperature of all fuel gases
c. This fuel gas has the highest combustion
temperature of all fuel gases
d. The combustion is effected by a high
concentration area
e. both a and d
Correct Answer:
e. both a and d

12. 11. How are the movement and working processes of fully mechanized TIG welding and gas shielded metal arc welding
defined?
Options:
a. Mechanical manipulation of the torch
b. Manual manipulation of the torch
c. Manual filler metal feed and movement
d. Mechanical filler metal feed
e. both a and d
Correct Answer:
e. both a and d

13. 12. Which of the following statements concerning serial connection of different resistances are correct?
Options:
a. At all resistance there is same voltage
difference
b. The current is equal in all three resistance
c. The current is not equal in all three resistance
d. The total resistance is the sum of all single
resistance
e. both b and d
Correct Answer:
e. both b and d

14. 13. Which of the following formula to calculate the electric power is correct?
Options:
a. P = U2
x I2
b. P = U / I2
c. P = U2
x I
d. P = U x I
e. P = U / I
Correct Answer:
d. P = U x I

15. 14. Which of the following statements regarding electromagnetism is correct?
Options:
a. Only conductors made of ferromagnetic materials
are suitable for making a electromagnet
b. There is an electric field only around a conductor
where a direct current flows through
c. There is an electric field only around a conductor
where alternating current flows through
d. Attracting forces are effective between parallel
conductors with the same direction of current
e. Electromagnets work only with direct current
Correct Answer:
d. Attracting forces are effective between
parallel conductors with the same direction of
current

16. 15. The cellulose type electrode (EXX10) are beneficial for:
Options:
a. Vertical downhill welding
b. Thick plate fill pass
c. Welding of sheet metal
d. Welding of roots runs in pipeline welding
e. both a and d
Correct Answer:
e. Both a and d

17. 16. Gas shielded metal arc welding is divided into
Options:
a. MAG and FCAW
b. TIG and MAG
c. MAG-C and MAG-M
d. MIG and MAG
e. Both c and d
Correct Answer:
d. MIG and MAG

18. 17. Which of the following statements regarding welding arc is correct?
Options:
a. The arc cannot be ignited without contact
b. The arc can only be ignited contactless with
ignition device
c. Arc welding can only be performed with direct
current
d. Arc welding can only be performed with
alternating current
e. Arc welding can be performed with direct and
alternating current
Correct Answer:
e. Arc welding can be performed with direct
and alternating current

19. 18. Which mechanism creates charged particles in the arc?
Options:
a. Shock emission
b. Magnet emission
c. Stray emission
d. Field emission, Shock ionization
e. Neutron emission
Correct Answer:
d. Field emission, Shock ionization

20. 19. Personal Protective welding equipment’s consists of,
Options:
a. Flame resistant clothes
b. Water resistant clothes
c. Gloves, safety shoes
d. Apron to protect from sun heat
e. both a and c
Correct Answer:
e. both a and c

21. 20. Which of the following are the parts of the welding arc?
Options:
a. Anode and cathode fall area
b. Arc column, arc plasma
c. Short arc
d. Pulsed arc
e. both a and b
Correct Answer:
e. both a and b

22. 21. What is called pinch effect in the welding arc?
Options:
a. A drop detachment of the wire electrode in
GMAW
b. The heating up of the tungsten electrode when
TIG welding
c. Construction of the free and liquid wire end
d. Ripping apart the oxide skin when aluminum
welding
e. both a and c
Correct Answer:
e. both a and c

23. 22. The charged particle in the arc are created by
Options:
a. Mechanical friction
b. Welding current and voltage
c. Dissociation followed by Ionization
molecules
d. Depend upon the shielding gas
e. both c and d
Correct Answer:
c. Dissociation followed by Ionization
molecules

24. 23. Which of the following are the tasks of shielding gas in tungsten inert gas welding?
Options:
a. Increase the weld speed
b. Cooling the welding torch
c. Protect the electrode and the welding pool
from oxidation
d. Creation of charged particles in the welding
arc
e. b, c and d
Correct Answer:
e. b, c and d

25. 24. Which statements are correct related to welding arc?
Options:
a. It is created by the shielding gases
b. It is created by the welding voltage
c. It consists of plasma
d. It acts like an ohm resistance
e. both c and d
Correct Answer:
e. both c and d

26. 25. Which statements is correct regarding the arc length variation during welding?
Options:
a. Rise in voltage gives rise in arc length
b. Rise in current gives rise in arc length
c. Voltage decreases, increase the arc length
d. Current increase, lower the arc length
e. both a and d
Correct Answer:
e. both a and d

27. 26. What is the criteria for the selection of the welding processes?
Options:
a. Geometry of the production area
b. Geometry of the office area
c. Qualification of the welding inspector
d. Economic efficiency of the welding process
e. Accessibility of the welding inspector
Correct Answer:
d. Economic efficiency of the welding process

28. 27. When using the SAW hotwire process, the advantage over the conventional submerged arc welding?
Options:
a. Increase the travel speed
b. Reduce the travel speed
c. Increase the deposition rate
d. Decrease the deposition rate
e. both a and c
Correct Answer:
e. both a and c

29. 28. Which are the internal defects in submerged arc welding?
Options:
a. Root side suck back
b. Porosity not open to surface
c. Lack of fusion
d. both c and e
e. Lamellar tearing
Correct Answer:
d. both c and e

30. 29. The purposes of SAW flux during welding are
Options:
a. To avoid the extreme formation of the slag
b. Allow fast cooling of the weld
c. Used to shield the hot molten pool
d. Serve to increase the electricity
conductivity of the arc gap
e. both c and d
Correct Answer:
e. both c and d

31. 30. Submerged arc welding is a
Options:
a. Manual process
b. Semi-automatic process
c. Mechanized process
d. Robotic process
e. both b and c
Correct Answer:
c. Mechanized process

32. 31. Which electrode coating produce highest weld metal toughness in a welding joint when used in shielded metal arc
welding process?
Options:
a. Cellulose types
b. Rutile types
c. basic types
d. Acidic rutile type
e. both c and d
Correct Answer:
c. basic types

33. 32. A flux cored wire can be defined as
Options:
a. A welding electrode produced by wrapping of
thin sheet
b. An endless, inverted stick electrode
appearance
c. A metal filled welding filler wire
d. A hollow pipe filled with powder for welding
in gas metal arc welding
e. None of the above
Correct Answer:
b. An endless, inverted stick electrode
appearance

34. 33. When comparing MIG-MAG welding to TIG, the major differences are
Options:
a. Types of the shielding gas
b. Types of welding filler wire
c. Weld deposition rate
d. Types of welding power source
e. both c and d
Correct Answer:
e. both c and d

35. 34. What should be the included angle for 10 mm thickness steel plate V groove joint?
Options:
a. 15 to 30 degree
b. 40 to 60 degree
c. minimum 70 degree
d. square butt joint is suitable for 10 mm
thickness
e. 30 degree with a root gap of 2.5 mm
Correct Answer:
b. 40 to 60 degree

36. 35. How the arc length influences the weld geometry?
Options:
a. A too long arc length will produce undercut
b. The arc length has no effect on the weld
geometry
c. The weld width increases with increasing arc
length
d. The weld width will decrease with increasing
arc length
e. both a and c
Correct Answer:
e. both a and c

37. 36. Spray arc in gas metal arc welding is beneficial for?
Options:
a. Welding the fill passes in thick plates
b. Welding open root run in groove welds
c. Welding sheet metal jobs
d. Only for fillet welds
e. both b and c
Correct Answer:
a. Welding the fill passes in thick plates

38. 37. Which of the following are the related terms for pulse metal transfer?
Options:
a. background current
b. peak current
c. pulse duration
d. background duration
e. all of the above
Correct Answer:
e. all of the above

39. 38. For welding the carbon steel and low alloy steel, the following shielding gas are the best preference
Options:
a. Gas mixture of M3 group
b. Gas mixture of M2 group
c. Pure argon gas
d. Pure CO2
e. Mixture of argon with high amount of CO2
Correct Answer:
b. Gas mixture of M2 group

40. 39. The advantages of the pulse welding are as follows
Options:
a. High productivity
b. Low heat input
c. Suitable for welding thick plates
d. Low spatters in welding operation with
reduced distortion
e. both b and d
Correct Answer:
e. both b and d

41. 40. Autogenous TIG welding process refer to following operation
Options:
a. TIG welding without the addition of filler
wire
b. TIG welding without the addition of tungsten
electrode
c. TIG welding with filler wire
d. GTAW welding without the addition of filler
wire
e. both a and d
Correct Answer:
e. both a and d

42. 41. Helium in TIG welding gives advantages of
Options:
a. A higher welding speeds
b. Lower preheat temperature
c. Deep penetration
d. A high welding voltage
e. All of the above
Correct Answer:
e. All of the above

43. 42. Increasing the content of active gas (such as CO2) in MAG welding will
Options:
a. help in reducing the welding spatters
b. Increase the alloy burnout
c. The spatters increase
d. results in lower mechanical characteristics
e. both c and d
Correct Answer:
e. both c and d

44. 43. Which of the following can be used as shielding gases in inert gas welding
Options:
a. Argon, helium and CO2
b. Argon, hydrogen
c. Argon, helium and neon
d. CO2 and argon mixture, argon and nitrogen
mixture
e. natural gas
Correct Answer:
c. Argon, helium and neon

45. 44. TIG welding process belongs to the types of welding processes with
Options:
a. Non-depositing electrode
b. depositing electrode
c. active shielding gas welding
d. mechanized welding
e. both a and d
Correct Answer:
a. Non-depositing electrode

46. 45. The arc creates
Options:
a. The necessary energy for the welding
processes
b. Ultraviolet & infrared radiation
c. harmful x-rays
d. rays in the dark area
e. both a and b
Correct Answer:
e. both a and b

47. 46. An active shielding gas is widely used for welding of carbon steel and low alloy steels when using GMAW. Which of
the following statement is correct in this contrast
Options:
a. Active shielding gas increase the productivity
b. carbon steel and low alloy steel do not
oxidize rapidly
c. active gas for shielding are economical
d. active gas are not used for welding of carbon
base steels
e. both a and c
Correct Answer:
b. carbon steel and low alloy steel do not
oxidize rapidly

48. 47. Gas metal arc welding processes use power sources which are having
Options:
a. a flat characteristic
b. a constant voltage characteristics
c. a dropping characteristic
d. a constant current
e. both a and b
Correct Answer:
e. both a and b

49. 48. Which are the following gases or their mixture are inert in nature
Options:
a. argon – CO2
b. argon – O2
c. argon - helium
d. argon – helium – CO2
e. both b and c
Correct Answer:
c. argon - helium

50. 49. Electrodes (EGW) welding for carbon steel resembles electroslag welding but the principles is based on
Options:
a. SAW
b. ESW
c. GMAW
d. GTAW
e. none of the above
Correct Answer:
c. GMAW

51. 50. What is the main reason why oxy fuel gas cutting cannot cut stainless steel?
Options:
a. higher melting point
b. refractory oxides
c. low thermal conductivity
d. it can be cut successfully
e. both a and c
Correct Answer:
b. refractory oxides

52. 51. Which SMAW/MMAW electrode would give the highest recovery rate?
Options:
a. iron powder
b. rutile
c. cellulose
d. basic
e. both b and d
Correct Answer:
a. iron powder

53. 52. What is the purpose of a rectifier on welding equipment?
Options:
a. changes AC to DC
b. steps up amperage, steps down voltage
c. steps up voltage, steps down amperage
d. all of the above
e. both a and b
Correct Answer:
e. both a and b

54. 53. When performing shielded metal arc welding, which welding electrode would give the highest hydrogen content in the
final weld deposit?
Options:
a. rutile
b. iron powder
c. basic
d. cellulose
e. both a and d
Correct Answer:
d. cellulose

55. 54. Which are the typical range for spray transfer to take place in gas metal arc welding?
Options:
a. 21V 200A
b. 26V 230A
c. 24V 190A
d. 20V 150A
e. 15V 160A
Correct Answer:
b. 26V 230A

56. 55. In MIG/MAG welding, if stick out length was increased what would be the affect?
Options:
a. voltage would increase
b. amperage would increase
c. amperage would decrease
d. voltage would decrease
e. both a and c
Correct Answer:
e. both a and c

57. 56. A high frequency device in gas tungsten are welding or TIG welding support the?
Options:
a. arc striking without electrode contact
b. pulses the welding current
c. smoothens the welding current
d. increase tungsten life
e. increase electrode melt off rate
Correct Answer:
a. arc striking without electrode contact

58. 57. What is the purpose of an A.C balance control function?
Options:
a. gives good arc stability
b. allows greater control over amperage
c. gives control over penetration
d. allows switching from DC to AC
e. none of the above
Correct Answer:
a. gives good arc stability

59. 58. The pure tungsten electrodes which works as non-consumable in TIG welding are not used extensively?
Options:
a. too expensive
b. they melt at high temperatures
c. they have an unstable arc
d. difficult to prepare
e. pure tungsten not used in TIG welding
Correct Answer:
b. they melt at high temperatures

60. 59. The term CPS means
Options:
a. current positive system
b. cycles per second
c. cycles positive sometimes
d. current permanently smooth
e. current per second
Correct Answer:
b. cycles per second

61. 60. In brazing when comparing to soldering process, the melting point of the filler material is?
Options:
a. above that of the parent material
b. below 450° C
c. above 450° C
d. about the same as the material
e. above 750° C
Correct Answer:
c. above 450° C