WELDING MCQ SET 2
Q1. The neutral flame in oxy-acetylene welding has:
A) Excess oxygen
B) Excess acetylene
C) Equal parts of oxygen and acetylene
D) Only acetylene
Answer: C) Equal parts of oxygen and acetylene
Explanation: A neutral flame has equal gas flow rates and gives a balanced combustion suitable for most metals.
Q2. The oxidizing flame contains:
A) Excess oxygen
B) Excess acetylene
C) Equal gases
D) No oxygen
Answer: A) Excess oxygen
Explanation: Oxidizing flames have more oxygen and are used for welding copper or brass.
Q3. A carburizing (reducing) flame has:
A) More acetylene
B) More oxygen
C) Equal gases
D) No acetylene
Answer: A) More acetylene
Explanation: Carburizing flame enriches the weld with carbon and is used for special applications like tool steel.
Q4. The main parts of a welding torch are:
A) Nozzle, handle, and gas mixing chamber
B) Only nozzle
C) Cylinder and pipe
D) Gas regulator
Answer: A) Nozzle, handle, and gas mixing chamber
Explanation: These parts control and mix gases before the flame exits the nozzle.
Q5. The purpose of a welding regulator is to:
A) Increase gas pressure
B) Control gas pressure from the cylinder
C) Mix gases
D) Cool the torch
Answer: B) Control gas pressure from the cylinder
Explanation: Regulators ensure steady gas flow and prevent sudden pressure changes.
Q6. The most suitable flame for welding mild steel is:
A) Neutral flame
B) Carburizing flame
C) Oxidizing flame
D) Cold flame
Answer: A) Neutral flame
Explanation: Neutral flame prevents oxidation and carbonization of mild steel.
Q7. In arc welding, the electrode is connected to:
A) Both terminals
B) Positive or negative depending on polarity
C) Only neutral
D) Only earth
Answer: B) Positive or negative depending on polarity
Explanation: Polarity (DCEN or DCEP) is selected based on electrode type and metal thickness.
Q8. The filler metal in welding is used to:
A) Reduce the weld strength
B) Fill the gap between workpieces
C) Clean the metal
D) Cool the joint
Answer: B) Fill the gap between workpieces
Explanation: Filler metal provides additional material to make a strong joint.
Q9. The process of joining metals using heat and non-ferrous filler metal below 450ยฐC is called:
A) Welding
B) Brazing
C) Soldering
D) Riveting
ย Answer: C) Soldering
Explanation: Soldering uses low melting point filler metals like tin-lead alloy.
Q10. The process similar to soldering but with a higher temperature (above 450ยฐC) is:
A) Welding
B) Brazing
C) Cutting
D) Lathing
Answer: B) Brazing
Explanation: Brazing uses non-ferrous filler metals like brass or bronze at higher temperatures.
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