Welding Metallurgy MCQ Questions and Answers | Metallurgical Engineering Page-2 section-1

11.
Match the joining processes in Group 1 with the filler material in Group 2.

Group 1 Group 2

P. Soldering 1. Silver-titanium alloy

Q. Welding 2. Silver-tin alloy

R. Brazing 3. Mild steel

4. Lead fluoride

A. P-2, Q-3, R-1

B. P-1, Q-2, R-3

C. P-3, Q-1, R-2

D. P-2, Q-4, R-1

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12.
Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion (a): During welding of aluminium alloys by the gas tungsten arc welding process, direct current reverse polarity (DCRP) mode is used.
Reason (r): DCRP facilitate breaking up of the oxide film on the workpiece surface.

A. a is true but r is false

B. a is false but r is true

C. both a and r are true, and r is the reason for a

D. both a and r are true, and r is not the reason for a

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13.
"Cold cracking" in the heat affected zone of a high strength steel weld can take place because of

A. retained austenite

B. martensite formation

C. relatively high sulphur content in the base metal

D. sufficient hydrogen present in the welding arc

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14.
Steels with high carbon equivalent have poor weldability because in these steels during welding

A. carbon and other alloying elements get oxidised from the weld pool

B. excessive ferrite forms in the heat affected zone leading to the poor toughness of the weld

C. martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

D. segregation of carbon and other elements occurs in the weld pool leading to poor properties of the weld

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15.
Which of the following is not a fusion welding process?

A. Arc welding

B. Gas welding

C. Resistance welding

D. Friction stir welding

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16.
Of the following welding processes
[P] Laser Beam Welding
[Q] Submerged Arc Welding
[R] Metal Inert Gas Welding
the width of the heat-affected zone in decreasing order is

A. P > Q > R

B. Q > R > P

C. R > P > Q

D. P > R > Q

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17.
In TIG welding thoriated tungsten electrodes are used because it

A. has higher current carrying capacity

B. has better electron emissivity

C. is stronger than ordinary tungsten

D. is easy to prepare

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18.
In the consumable electrode shielded metal arc welding process, which of the following observations are correct?
P. The, weld composition does not depend upon the basicity of the slag.
Q. Basic flux is used to achieve low hydrogen content-and low inclusion content in the weld metal.
R. Reverse polarity of the direct current power source is used to weld thin sheets.
S. Coated electrodes are classified by tensile strength of the weld metal deposit.

A. P, Q

B. P, R

C. Q, S

D. R, S

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19.
In an arc welding experiment, the current, voltage and electrode travel speed were 140 A, 22 V, and 15 cm/min respectively. The heat input per unit length of the weld is given by . . . . . . . . kJ/cm.

A. 24.64

B. 4.62

C. 9.24

D. 12.32

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20.
Match the welding process in Group 1 with the source of heat in Group 2.

Group 1 Group 2

P. Ultrasonic welding 1. Thermochemical

Q. Spot welding 2. Electrical resistance

R. SMAW 3. Friction

S. Thermit welding 4. Electric arc

A. P-3, Q-2, R-1, S-4

B. P-4, Q-3, R-2, S-1

C. P-1, Q-3, R-4, S-2

D. P-3, Q-2, R-4, S-1

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Group 1	Group 2
P. Soldering	1. Silver-titanium alloy
Q. Welding	2. Silver-tin alloy
R. Brazing	3. Mild steel
	4. Lead fluoride

Group 1	Group 2
P. Ultrasonic welding	1. Thermochemical
Q. Spot welding	2. Electrical resistance
R. SMAW	3. Friction
S. Thermit welding	4. Electric arc

Welding Metallurgy MCQ Questions and Answers | Metallurgical Engineering

11. Match the joining processes in Group 1 with the filler material in Group 2. Group 1 Group 2 P. Soldering 1. Silver-titanium alloy Q. Welding 2. Silver-tin alloy R. Brazing 3. Mild steel 4. Lead fluoride

Answer & Solution

Answer & Solution

13. "Cold cracking" in the heat affected zone of a high strength steel weld can take place because of

Answer & Solution

14. Steels with high carbon equivalent have poor weldability because in these steels during welding

Answer & Solution

15. Which of the following is not a fusion welding process?

Answer & Solution

16. Of the following welding processes [P] Laser Beam Welding [Q] Submerged Arc Welding [R] Metal Inert Gas Welding the width of the heat-affected zone in decreasing order is

Answer & Solution

17. In TIG welding thoriated tungsten electrodes are used because it

Answer & Solution

Answer & Solution

19. In an arc welding experiment, the current, voltage and electrode travel speed were 140 A, 22 V, and 15 cm/min respectively. The heat input per unit length of the weld is given by . . . . . . . . kJ/cm.

Answer & Solution

20. Match the welding process in Group 1 with the source of heat in Group 2. Group 1 Group 2 P. Ultrasonic welding 1. Thermochemical Q. Spot welding 2. Electrical resistance R. SMAW 3. Friction S. Thermit welding 4. Electric arc

Answer & Solution

11.
Match the joining processes in Group 1 with the filler material in Group 2.

Group 1 Group 2

P. Soldering 1. Silver-titanium alloy

Q. Welding 2. Silver-tin alloy

R. Brazing 3. Mild steel

4. Lead fluoride

13.
"Cold cracking" in the heat affected zone of a high strength steel weld can take place because of

14.
Steels with high carbon equivalent have poor weldability because in these steels during welding

15.
Which of the following is not a fusion welding process?

16.
Of the following welding processes
[P] Laser Beam Welding
[Q] Submerged Arc Welding
[R] Metal Inert Gas Welding
the width of the heat-affected zone in decreasing order is

17.
In TIG welding thoriated tungsten electrodes are used because it

19.
In an arc welding experiment, the current, voltage and electrode travel speed were 140 A, 22 V, and 15 cm/min respectively. The heat input per unit length of the weld is given by . . . . . . . . kJ/cm.

20.
Match the welding process in Group 1 with the source of heat in Group 2.

Group 1 Group 2

P. Ultrasonic welding 1. Thermochemical

Q. Spot welding 2. Electrical resistance

R. SMAW 3. Friction

S. Thermit welding 4. Electric arc