Welding MCQ Multiple Choice Questions Answers - Page 4 | Quiz for Practice

Q: 46. The arc utilized in electric arc welding is a

Correct Answer is: Low voltage, high current discharge

Q: 47. The size of a welding machine is determined by

Correct Answer is: Output amperage

Q: 49. In a gas cut plate, the cut is high quality although there is some surface roughness caused by vertical drag lines. This is due to

Correct Answer is: less preheating flame

Q: 50. The welding machine, which is used to convert AC welding supply to DC welding supply is

Correct Answer is: Rectifier set

Q: 51. The correct flame for preheating before cutting is

Correct Answer is: neutral flame

Q: 52. Neutral flame in gas welding contains

Correct Answer is: More oxygen than Acetylene

Q: 53. In DC welding heat distribution is possible between electrode and the base metal due to the change of polarity. The distribution of heat is

Correct Answer is: Psitive 2/3 and negative 1 /3

Q: 54. The correct colours for oxygen and acetylene hoses are:

Correct Answer is: Black for oxygen and red for acetylene

Q: 56. Cast iron contains two elements, which make it difficult to cut it by gas cutting. What are these elements?

Correct Answer is: Silicon and graphite

Q: 57. The function of the central hole in the tip of the cutting blowpipe is

Correct Answer is: Supply oxygen for cutting

Welding MCQ Questions for Practice

46. The arc utilized in electric arc welding is a

High voltage, high current discharge
Low voltage, low current discharge
Low voltage, high current discharge
High voltage, low current discharge

47. The size of a welding machine is determined by

Input amperage
Output amperage
Open circuit voltage
Closed circuit voltage

48. If L (mm) is the length of the inner cone of the flame, the tip-to-metal distance should be

L mm
L + 2 mm
L + 4 mm
L + 6 mm

49. In a gas cut plate, the cut is high quality although there is some surface roughness caused by vertical drag lines. This is due to

less preheating flame
impure cutting oxygen
too slow cutting speed
smaller size cutting nozzle

50. The welding machine, which is used to convert AC welding supply to DC welding supply is

Motor generator set
Engine generator set
Rectifier set
Welding transformer

51. The correct flame for preheating before cutting is

oxidizing flame
neutral flame
carburising flame
slightly carburizing flame

52. Neutral flame in gas welding contains

oxygen & Actylene in equal proportion
More oxygen than Acetylene
less oxygen than Acetylene
None of the above

53. In DC welding heat distribution is possible between electrode and the base metal due to the change of polarity. The distribution of heat is

Psitive 2/3 and negative 1 /3
Positive 1 /3 and negative 2/3
Positive 3/4 and negative 1/4
Positive 1/4 and negative 3/4

54. The correct colours for oxygen and acetylene hoses are:

Red for oxygen and blue for acetylene
Black for oxygen and red for acetylene
Black for oxygen and maroon for acetylene
Red for oxygen and maroon for acetylene

55. Which one of the following is the type of transformer used in arc welding?

Step down
Step up
One-to-one
Capable of increasing supply voltage

56. Cast iron contains two elements, which make it difficult to cut it by gas cutting. What are these elements?

Sulphur and phosphorous
Silicon and graphite
Graphite and phosphorous
Silicon and sulphur

57. The function of the central hole in the tip of the cutting blowpipe is

Supply oxygen for preheating
Supply acetylene for preheating
Supply oxygen for cutting
Supply acetylene for cutting

58. In gas cutting, if too little cutting oxygen is supplied

the metal will be cooled down
the kerf will be narrow
the kerf will be wide
the metal will fail to cut completely

59. The size of the cutting nozzle used in oxy-acetylene cutting process depends mainly on

thickness of metal to be cut
purity of oxygen
duration of cut
type of cutting blowpipe

60. Which of the gases can be used to form a protective envelope in arc welding?

Oxygen and Carbon dioxide
Hydrogen and Helium
Oxygen and Helium
Helium and Carbon dioxide