Manufacturing Process Technology part-2
Assignment – 08
1. In sheet metal blanking, shear is provided on punches and dies so that
(a) press load is reduced
(b) good cut edge is obtained
(c) warping of sheet is minimized
(d) cut blanks is straight
2. Blanking and piercing operations can be performed simultaneously in a
a) simple die
b) progressive die
c) compound die
d) combination die
3. In sheet metal work, he cutting force on the tool can be reduced by
a) grinding the cutting edges sharp
b) increasing the hardness of tool
c) providing shear on tool
d) increasing the hardness of die
4. A 50 mm diameter disc is to be punched out from a carbon steel sheet 1.0 mm thick. The
diameter of the punch should be
a) 49.925 mm
b) 50.00 mm
c) 50.075 mm
d) None
5. For a rigid perfectly plastic work material, negligible interface friction and no redundant
work, the theoretically maximum possible reduction in wire drawing operation is
a) 0.36
(b) 0.63
(c) 1.00
(d) 2.72
6. A shell of 100 mm diameter and 100 mm height with the corner radius of 0.4 mm is to be
produced by cup drawing. The required blank diameter is
a) 118 mm
b) 161 mm
c) 224 mm
d) 312 mm
MOOC course under NPTEL (July 2016)
IIT Kanpur
Manufacturing Process Technology part-2
Assignment – 08
7. A brass billet is to be extruded from its initial diameter of 100 mm to a final diameter of
50 mm. The working temperature is 70oC and the extrusion constant is 250 MPa. The
force
a) 5.44 MN
b) 2.72 MN
c)1.36 MN
d) 0.36 MN
8. A metal disc of 20 mm diameter is to be punched from a sheet of 2 mm thickness. The
punch and the die clearance is 3%. The required punch diameter is
a) 19.88 mm
b) 19.94 mm
c) 20.06 mm
d) 20.12 mm
9. The amount of reduction in a single pass which can be achieved in wire drawing of a
non-strain hardening material is limited. This limit depends on:
a) Yield strength of the material
b) The die angle
c) The coeff. Of friction between the die and the material
d) Ductility of the material measured by % reduction in area in a tension test.
10. In a wire drawing operation, diameter of a steel wire is reduced from 10mm to 8mm. The
mean flow stress of the material is 400MPa. The ideal force required for drawing
(ignoring friction and redundant work) is
(a) 4.48kN
(b) 8.97kN
(c) 20.11kN
(d) 31.41kN
11. The blank diameter used in thread rolling will be
(a) equal to minor diameter of the thread
(b) a little larger than the minor diameter of the thread
(c) equal to pitch diameter of the thread
(d) a little larger than the pitch diameter of the thread
12. In sheet metal blanking, shear is provided on punches and dies so that
(a) cut blanks are straight
(b) warping of sheet is minimized
(c) good cut edge is obtained
(d) press load is reduced
MOOC course under NPTEL (July 2016)
IIT Kanpur
Manufacturing Process Technology part-2
Assignment – 08
13. A 25 mm wide and 4 mm thick steel sheet is required to be bent at 60 0 at bend radius 5
mm. Determine the bend allowances.
(a) 6.614 mm
(b) 6.614 cm
(c) 7.32 mm
(d) 7.32 cm
14. A 300 mm long and 3 mm thick piece of carbon steel sheet is required to be bent at 900
using a V – die. Assume the yield stress of the material as 500 MPa and the die opening as
10 times the material thickness. Estimate the force required for the operation. (k = 1.3 for
V die).
(a) 65 kN
(b) 58.5 N
(c) 58.5 KN
(d) 65 N
15. A 400 mm long and 2.5 mm thick piece of carbon steel sheet is required to be bent at 90 0
using a wiping die with radius = 3.75 mm, what is the force requirement? Assume the yield
stress of the material as 500 MPa.
(a) 37.5 kN
(b) 29.5 kN
(c) 37.5 N
(d) 30 KN
16. The machining process that adds rather than removes material is called ____________.
(a) additive manufacturing
(b) electro discharge machining
(c) plasma cutting
(d) chip thinning
17. Which of the following rapid prototyping processes starts with a photosensitive liquid
polymer to fabricate a component (more than one)?
(a) ballistic particle manufacturing,
(b) fused deposition modeling,
(c) selective laser sintering,
(d) solid ground curing, and
(e) stereolithography.
18. Of all of the current material addition rapid prototyping technologies, which one is the
most widely used?
(a) ballistic particle manufacturing,
(b) fused deposition modeling,
(c) selective laser sintering,
MOOC course under NPTEL (July 2016)
IIT Kanpur
Manufacturing Process Technology part-2
Assignment – 08
(d) solid ground curing, and
(e) stereolithography.
19. Which of the following RP technologies use a liquid as the starting material (more than
one)?
(a) fused deposition modeling,
(b) laminated object manufacturing,
(c) selective laser sintering,
(d) solid ground curing, and
(e) stereolithography.
20. Which one of the following RP technologies uses solid sheet stock as the starting
material?
(a) ballistic particle manufacturing,
(b) fused deposition modeling,
(c) laminated object manufacturing,
(d) solid ground curing, and
(e) stereolithography.
21. Which of the following RP technologies uses powders as the starting material (more than
one)?
(a) ballistic particle manufacturing,
(b) fused deposition modeling,
(c) selective laser sintering,
(d) solid ground curing, and
(e) three dimensional printing.
22. Which of the following are problems with the current material addition rapid prototyping
technologies (more than one)?
(a) inability to convert a solid part into layers,
(b) limited material variety,
(c) part accuracy, and
(d) part shrinkage.
23. Polyvinyl chloride is a
(a) thermoplastic material
(b) thermosetting material
(c) elastomeric material
(d) epoxy resin
24. Rapid prototyping processes are slower than other conventional processes such as metal
cutting.
(a) true
(b) false
(c) same
MOOC course under NPTEL (July 2016)
IIT Kanpur
Manufacturing Process Technology part-2
Assignment – 08
25. A prototype of a tube with a square cross-section is to be fabricated using stereo
lithography. The outside dimension of the square = 100 mm and the inside dimension = 90
mm (wall thickness = 5 mm except at corners). The height of the tube (z-direction) = 80
mm. Layer thickness = 0.10 mm. The diameter of the laser beam (“spot size”) = 0.25 mm,
and the beam is moved across the surface of the photopolymer at a velocity of 500 mm/s.
Compute an estimate for the time required to build the part, if 10 s are lost each layer to
lower the height of the platform that holds the part. Neglect the time for post curing.
(a) 2.6 hr
(b) 5.6 hr
(c) 56 min
(d) 26 min
MOOC course under NPTEL (July 2016)
IIT Kanpur