51
Match the terms in
Group 1 to their descriptions in
Group 2 .
Group 1 Group 2
P. Hall-Petch effect
1. Solute dislocation interaction
Q. Bauschinger effect
2. Dislocation multiplication
R. Cottreli atmosphere
3. Grain boundary strengthening
4. Barelling under compression
5. Mechanical hysterisis during plasticity
A)
P-3, Q-5, R-1
B)
P-1, Q-4, R-3
C)
P-5, Q-1, R-2
D)
P-3, Q-4, R-2
Answer & Solution
Answer: Option
A
52
Fatigue resistance of a steel is reduced by
A)
decarburisation
B)
polishing the surface
C)
reducing the grain size
D)
shot peening
Answer & Solution
Answer: Option
A
53
Flash in a close die forging.
A)
is excess material that has been squirted out of the die
B)
is to provide excess temperature to the material
C)
helps in filling all the recesses in the die
D)
is always of uniform cross-sectional area
Answer & Solution
Answer: Option
A
54
Match the stress state with the corresponding forming process.
P. Direct compressive
1. Wire drawing
Q. Indirect compressive
2. Sheet blanking
R. Tensile
3. Forging
S. Shear
4. Stretch forming
A)
P-3, Q-1, R-2, S-4
B)
P-1, Q-2, R-3, S-4
C)
P-4, Q-3, R-2, S-1
D)
P-3, Q-1, R-4, S-2
Answer & Solution
Answer: Option
D
55
The spring back phenomenon in metal sheet bending can be compensated by
A)
bending the part to a smaller than desired radius of curvature
B)
bottoming the punch in a die
C)
using low temperature bending
D)
using high viscosity lubricant
Answer & Solution
Answer: Option
A
56
Match the items in
Group 1 with the manufacturing processes in
Group 2 .
Group 1 Group 2
P. Upsetting operation
1. Extrusion
Q. Port hole die
2. Forging
R. Bullblock
3. Rolling
S. Orange peel effect
4. Wire drawing
5. Deep drawing
6. Sheet forming
A)
P-2, Q-6, R-3, S-1
B)
P-5, Q-2, R-1, S-6
C)
P-4, Q-6, R-3, S-3
D)
P-2, Q-1, R-4, S-5
Answer & Solution
Answer: Option
D
57
In extrusion of metals, which of the following statement(s) is/are true?
A)
Speed of the extruded material is the same as that of ram speed
B)
Redundant work is a function of die angle
C)
Relative motion between the billet surface and the container wall is always present
D)
Hollow ram is used for indirect extrusion
Answer & Solution
Answer: Option
B
58
Match the defects listed in
Group I with the processes listed in
Group II .
Group I Group II
P. Cold Shut
1. Rolling
Q. Earing
2. Forging
R. Alligatoring
3. Deep drawing
S. Shrinkage porosity
4. Fusion welding
A)
P-2, Q-4, R-1, S-4
B)
P-2, Q-4, R-3, S-1
C)
P-2, Q-3, R-1, S-4
D)
P-4, Q-1, R-2, S-3
Answer & Solution
Answer: Option
C
59
Match the manufacturing process of
Group I to be used for producing the product for
Group II .
Group I Group II
P. Drawing
1. Large curved disc
Q. Forging
2. Tube
R. Rolling
3. Crank shaft
S. Stretch forming
4. Plate
A)
P-2, Q-3, R-4, S-1
B)
P-1, Q-4, R-3, S-2
C)
P-3, Q-2, R-1, S-4
D)
P-4, Q-1, R-2, S-3
Answer & Solution
Answer: Option
A
60
An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is
A)
0
B)
60
C)
30
D)
20
Answer & Solution
Answer: Option
A
