Question 1
For joining two insoluble materials such as iron and silver which of the following filler material is used?
A. Cobalt
B. Tin
C. Aluminium
D. Zinc
View Answer
Answer: Option B
Explanation:
Tin is used for joining two insoluble materials such as iron and silver because it is soluble in both the parent material (i.e. silver and iron).
Question 2
In welding the strength of the joint piece could be?
A. Equal to that of parent metal
B. Greater than that of parent metal
C. Equal or Greater than that of parent metal
D. Is lesser than the parent metal
View Answer
Answer: Option C
Explanation:
The strength of perfectly welded joint is more than the parent metal, due to the formation of alloy. The alloy formation at the welded portion makes it the strongest portion while the nearby zones where uncontrolled cooling take place because of heat is the weakest zone (heat affected zone). In general we can say that on the basis of strength: welded portion > parent material > heat affected zone.
Question 3
In welding, two parts are joined by bringing them to a temperature of?
A. Above melting point temperature
B. Below melting point temperature
C. Equal to melting point temperature
D. Equal to Curie temperature
View Answer
Answer: Option A
Explanation:
In welding one needs to melt the base metals to fuse them.
Question 4
In which of the following joining process the filler material used is different as the parent material?
A. Autogenous
B. Homogenous
C. Heterogenous
D. Either homogenous or heterogenous
View Answer
Answer: Option C
Explanation:
In heterogenous joining process the filler material used is different as the parent material.
Question 5
In which of the following joining process, the filler material used is the same as the parent material?
A. Autogenous
B. Homogenous
C. Heterogenous
D. Either homogenous or heterogenous
View Answer
Answer: Option B
Explanation:
In homogenous joining process the filler material used is the same as the parent material.
Question 6
In which of the following welding process no filler material is added during joining?
A. Autogenous
B. Homogenous
C. Heterogenous
D. Either homogenous or heterogenous
View Answer
Answer: Option A
Explanation:
In autogenous welding process no filler material is added during joining, the filler material can be supplied by melting the base metal.
Question 7
Pinch effect in welding is the result of?
A. Electromagnetic forces
B. Electrostatic forces
C. Magnetic forces
D. Electric forces
View Answer
Answer: Option A
Explanation:
Pinch effect in welding gives narrow and long flame which is concentrated on the desired part and is achieved by an induction coil, which results in electromagnetic forces.
Question 8
The depth up to which, the filler material is mixed up with base metal is called?
A. Deposition
B. Reinforcement
C. Penetration
D. Fusion depth
View Answer
Answer: Option C
Explanation:
The depth up to which the filler material is mixed up with base metal is called as penetration. Penetration can be increased by increasing temperature and appropriate flux.
Question 9
The heavier oxide films are removed by using?
A. Basic flux
B. Emery
C. Organic solvents
D. Neutral flux
View Answer
Answer: Option B
Explanation:
Oxide films should be removed before welding. Heavier oxide films may be removed by acid pickling, emery or by wire brusing.
Question 10
The junction between two workpieces and weld face is known as?
A. Throat
B. Toe
C. Root
D. Puddle
View Answer
Answer: Option A
Explanation:
The throat of a weld is the distance from the centre of the face to the root of the weld. Typically, the depth of the throat should be at least as thick as the thickness of the metal we are welding.
Question 11
The junction between weld face and base metal is known as?
A. Throat
B. Toe
C. Root
D. Puddle
View Answer
Answer: Option B
Explanation:
The junction of the weld face and the base metal is known as ‘toe’. For a better weld, the junction should be as small as it can be in size.
Question 12
The oil substances are removed from the interface by using which of the following organic solvent?
A. Acetone
B. Carbon tetrachloride
C. Acetone & Carbon tetrachloride
D. Ethylene glycol
View Answer
Answer: Option C
Explanation:
Both acetone and carbon tetrachloride are used to remove the oil substances from the interface.
Question 13
The portion at which two workpieces are at the nearest distance is called?
A. Throat
B. Toe
C. Root
D. Puddle
View Answer
Answer: Option C
Explanation:
The weld root is the point at which the back of a weld intersects with the base metal surfaces. It determines the weld penetration and fusion to form a rigid joint.
Question 14
The portion of weld joint that is melted by the heat of melting is called as ______________
A. throat
B. toe
C. root
D. puddle
View Answer
Answer: Option D
Explanation:
The arc spot or “puddle” weld is started by striking an arc on the deck surface, causing a hole to form in the deck. The weld operation then continues by depositing electrode material on the beam or joist and allowing the molten “puddle” to engage the penetrated deck.
Question 15
The raised potion from the parent metal in welding is known as __________
A. deposition
B. fusion depth
C. penetration
D. reinforcement
View Answer
Answer: Option D
Explanation:
Weld metal in excess of the quantity required to fill a joint. This can be machined for a good surface finish.
Question 16
Weld pass is associated with the movement of __________
A. torch
B. metal
C. flux
D. electrode
View Answer
Answer: Option A
Explanation:
A single progression of welding or surfacing along a joint or substrate. The result of a pass is a weld bead.
Question 17
What is the function of a torch?
A. It controls fuel rate
B. It mixes fuel and oxygen and controls delivery
C. It controls oxygen rate
D. It mixes fuel and hydrogen
View Answer
Answer: Option B
Explanation:
Torch mixes fuel and oxygen and controls delivery. It has two control valves, one for controlling the flow of acetylene and the other of oxygen, entering a chamber called mixing chamber where the two gases are mixed in a correct proportion.
Question 18
Which of the following does not require fluxes to eliminate the oxides present in them?
A. Mild steel
B. Copper
C. Aluminium
D. Magnesium
View Answer
Answer: Option A
Explanation:
Mild steel does not require flux to eliminate the oxides, due to the fact that iron oxide has relatively low melting point when compared to other non-ferrous metals given.
Question 19
Which of the following is a type of autogenous welding?
A. Arc
B. Gas
C. Brazing
D. Resistance
View Answer
Answer: Option D
Explanation:
Resistance welding is inherently autogenous as there is no convenient way to apply a filler material.
Question 20
Which of the following is a type of heterogeneous welding?
A. Gas
B. Solid phase
C. Arc
D. Soldering
View Answer
Answer: Option D
Explanation:
Certain welding processes such as plasma arc welding, friction stir welding, laser beam welding, etc. can be performed in heterogenous mode.
Question 21
Which of the following is a type of homogenous welding?
A. Gas
B. Solid phase
C. Brazing
D. Resistance
View Answer
Answer: Option A
Explanation:
Gas metal arc welding (GMAW), manual metal arc welding (MMAW), flux cored arc welding (FCAW), etc. always use consumable filler material and thus can be performed in homogenous mode.
Question 22
Which of the following is a type of welding joint?
A. Tee joint
B. Lap joint
C. Corner joint
D. All of the Mentioned
View Answer
Answer: Option D
Explanation:
Different types of welding joints are depicted below:
Question 23
Which of the following process involves metallurgical fusion?
A. Forming
B. Welding
C. Forging
D. Extrusion
View Answer
Answer: Option B
Explanation:
Welding joins metals by melting and fusing them together, typically with the addition of a welding filler metal.
Question 24
When two insoluble materials such as iron and silver are supposed to join, which of the following joining process is used?
A. Autogenous
B. Homogenous
C. Heterogenous
D. Either homogenous or heterogenous
View Answer
Answer: Option C
Explanation:
When two insoluble materials such as iron and silver are joined then heterogenous joining process is used.