1
GATE PI 2009
MCQ (Single Correct Answer)
+1
-0.3
Diamond cutting tools are not recommended for machining of ferrous metals due to
A
High tool hardness
B
High thermal conductivity of the work material
C
Poor tool roughness
D
Chemical affinity of tool material with iron
2
GATE PI 2009
MCQ (Single Correct Answer)
+2
-0.6
Using direct extrusion process, a round billet of $$100$$ $$mm$$ length and $$50mm$$ diameter is extruded. Considering an ideal deformation process (no friction and no redundant work), extrusion ratio $$4$$ and average flow stress of material $$300$$ $$MPa,$$ the pressure $$(MPa)$$ on the $$ram$$ will be
A
$$416$$
B
$$624$$
C
$$700$$
D
$$832$$
3
GATE PI 2009
MCQ (Single Correct Answer)
+2
-0.6
A disc of $$200$$ $$mm$$ diameter is blanked from a strip of an aluminium alloy of thickness $$3.2$$ $$mm.$$ The material shear strength to fracture is $$150$$ $$MPa.$$ The blanking force (in $$kN$$) is
A
$$291$$
B
$$301$$
C
$$311$$
D
$$421$$
4
GATE PI 2009
MCQ (Single Correct Answer)
+1
-0.3
Anisotropy in rolled components is caused by
A
Change in dimensions
B
scale formation
C
closure of defects
D
Grain orientation
EXAM MAP