Forging
Exam Duration: 45 Mins Total Questions : 20
In a hot working process
- (a)
grain structure of metal is refined
- (b)
mechanical properties are improved
- (c)
hardening is eliminated
- (d)
All of the above
In a cold working process
- (a)
ultimate tensile strength and hardness increases
- (b)
good surface finish is obtained
- (c)
internal and residual stresses are developed
- (d)
All of the above
In rolling operations, the roll rotates with a surface velocity
- (a)
lower than the speed of incoming metal
- (b)
exceeding the speed of incoming metal
- (c)
equal to speed of the incoming metal
- (d)
All of the above
Mass production of gears is done by
- (a)
hobbing
- (b)
milling
- (c)
shaping
- (d)
forming
Gear finishing operation is
- (a)
shaping
- (b)
milling
- (c)
hobbing
- (d)
saving or burnishing
Cold or hot rolling does not produce
- (a)
a T-section
- (b)
an I-section
- (c)
a channel section
- (d)
a hollow circular section
Seamless tube can be produced by
- (a)
two high rolling mill
- (b)
upsetting process
- (c)
piercing
- (d)
None of these
In blanking operation, clearan.ce is given in
- (a)
die
- (b)
punch
- (c)
Both (a) and (b)
- (d)
None of these
In piercing operation, clearance is given in
- (a)
die
- (b)
punch
- (c)
Both (a) and (b)
- (d)
None of these
Blanking and piercing operations can be performed simultaneously in
- (a)
progressive die
- (b)
simple die
- (c)
combination die
- (d)
compound die
In a turning operation on lathe machine, depth of cut is limited to 2 mm. The cutting speed is 44 m/min and feed is 1 mm/revolution. A shaft has diameter 50 mm. After the machining, the diameter of the shaft is 42 mm. Time required to be machined shaft on lathe is (the length of shaft is 100 cm)
- (a)
6.85 min
- (b)
6.43 min
- (c)
6.32 min
- (d)
6.54 min
A 90 mm diameter bar is to be reduced to 60 mm diameter. If depth of cut is 2.5 mm, the number of passes required to be
- (a)
8
- (b)
7
- (c)
6
- (d)
5
Determine the time required for machining a surface of 500 mm x 700 mm on a Shipping machine. The cutting speed is set 8 m/min. The return to cutting ratio is 2 : 3 and feed is 2 mm/cutting stroke. The clearance at each end is 60 mm.
- (a)
40.12 min
- (b)
45.2 min
- (c)
44 min
- (d)
42 min
In open die, forging disc having radius and height 50 mm and 20 mm. After forging radius is 100 mm, the value of true strain is
- (a)
1.386
- (b)
0.693
- (c)
2
- (d)
1
In wire drawing operation, diameter of steel wire is reduced from 6 mm to 4 mm. The mean flow of the material is 300 N/mm2 . The ideal force required for drawing is
- (a)
3452 N
- (b)
3506 N
- (c)
3483 N
- (d)
2580 N
A cup of 10 cm height and 5 cm diameter is to be made from a sheet metal of 2 mm thickness. The number of deductions necessary will be (If the limiting drawing ratio of material is 1.9.)
- (a)
1
- (b)
2
- (c)
3
- (d)
4
What is blank diameter of a 3 mm thick sheet to make a cup of height 150 mm and diameter 20 mm?
- (a)
115 mm
- (b)
116 mm
- (c)
111.3 mm
- (d)
115.6 mm
The bend allowance shown in figure is
- (a)
28.26 mm
- (b)
26.26 mm
- (c)
16.26 mm
- (d)
20.26 mm
The force required to make hole as shown in figure is (given て = 400 N/mm2 )
- (a)
1.92 MN
- (b)
2.00 MN
- (c)
1.84 MN
- (d)
1.64 MN
In a rolling process, roll diameter is 400 mm. The thickness of 30 mm strip is to be reduced to 20 mm in single pass. The coefficient of friction is
- (a)
0.170
- (b)
0.158
- (c)
0.163
- (d)
0.252