Engineering Questions with Answers - Multiple Choice Questions
Manufacturing Engineering – Gas Welding and Gas Cutting
1 - Question
Which of the following is also called “gas welding”?
a) Oxy fuel gas welding
b) Metallic welding
c) Arc welding
d) Fuel gas welding
View Answer
Explanation: Gas welding is also known as oxy fuel gas welding. In gas welding, fuel gases are used to generate high amount of heat and melt the metal.
2 - Question
How many types of flames are there in welding?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: There are three basic flame types: neutral (balanced), excess acetylene (carburizing), and excess oxygen (oxidizing) as shown below.
3 - Question
In which of the following type of flame, oxygen is of same proportion with acetylene?
a) Neutral flame
b) Oxidizing flame
c) Carburizing flame
d) Both oxidizing flame and carburizing flame
View Answer
Explanation: In neutral flame oxygen is in the same proportion with acetylene. Neutral welding flames are commonly used to weld: mild steel, stainless steel, cast iron, copper, aluminium, etc.
4 - Question
In which of the following type of flame, oxygen is in excess proportion with acetylene?
a) Neutral flame
b) Oxidizing flame
c) Carburizing flame
d) Both oxidizing flame and carburizing flame
View Answer
Explanation: Oxidizing welding flames are produced when slightly more than one volume of oxygen is mixed with one volume of acetylene. Oxidizing welding flames are commonly used to weld zinc, copper, manganese steel, cast iron, etc.
5 - Question
In which of the following type of flame, oxygen is deficient in proportion with acetylene?
a) Neutral flame
b) Oxidizing flame
c) Carburizing flame
d) Both oxidizing flame and carburizing flame
View Answer
Explanation: The carburizing flame has excess acetylene then oxygen. Reducing flame is used for the welding of low carbon and alloy steel.
6 - Question
Which of the following flame is harmful to steel?
a) Neutral flame
b) Oxidizing flame
c) Carburizing flame
d) Both oxidizing flame and carburizing flame
View Answer
Explanation: Oxidizing flame is harmful to steel. An oxidizing flame should not be used for welding steel because the deposited metal will be porous, oxidized and brittle. This flame will ruin most metals and should be avoided
7 - Question
For brazing, soldering and flame hardening which of the following flame is used?
a) Neutral flame
b) Oxidizing flame
c) Carburizing flame
d) Both oxidizing flame and carburizing flame
View Answer
Explanation: For brazing, soldering and flame hardening carburizing flame is used.
8 - Question
The inner cone of the flame in welding has the following nature?
a) Highest temperature
b) Coldest temperature
c) Moderate temperature
d) Uncertain
View Answer
Explanation: The inner cone of the flame has the highest temperature (3500°C). The outer flame has the lowest temperature.
9 - Question
The oxy acetylene gas welding is a type of?
a) Endothermic reaction
b) Exothermic reaction
c) Neutral reaction
d) Both endothermic reaction and exothermic reaction
View Answer
Explanation: The oxy acetylene gas welding is a type of exothermic reaction. 1 mole of acetylene can produce KJ/mol of heat.
10 - Question
The chemical formula of acetylene is?
a) C2H4
b) C2H6
c) C2H5OH
d) C2H2
View Answer
Explanation: The chemical formula of acetylene is C2H2. 1 mole of acetylene can produce KJ/mol of heat.