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WorksheetsPTT_D3B
Total questions: 50
Worksheet time: 25mins
Name
Class
Date
1.
Buckling of punches are subjected to______ stresses
a)
low-density
b)
Compression
c)
tensile
d)
force
2.
Volume and thickness in drawing ______
a)
Increases
b)
Decreases
c)
Remain constant
d)
None of these
3.
Fb=∏^2 x E x I/____________
a)
Lp^3
b)
Lp^2
c)
Lp^4
d)
Lp
4.
Modulus of Elasticity for steel varies from _____ GN/m2
a)
120 to 180
b)
210 to 230
c)
200 to 220
d)
250 to 280
5.
In the equation, Fb=∏^2 x E x I/Lp^2 the term Lp refer to _______
a)
Buckling force
b)
Length of the punch
c)
sheet metal width
d)
moment of inertia
6.
Thin punches subjected to compression stress,cause the punches to fail due to__________
a)
Buckling
b)
Breaking
c)
Cracking
d)
None of these
7.
_____ is a process of cold forming involving severe metal flow.
a)
Drawing
b)
Embossing
c)
Coining
d)
Forming
8.
The % reduction for cold rolled steel in 1st draw is ______.
a)
0.2
b)
0.4
c)
0.3
d)
0.15
9.
The blank development determines the______ diameter
a)
shell
b)
precut
c)
punch
d)
blank
10.
Drawing force can be calculated as percentage of_____ force.
a)
shearing
b)
press
c)
tensile
d)
compress
11.
If drawing ratio exceeds certain limit,the material fails due to ______ stresses.
a)
less
b)
same
c)
excessive
d)
shear
12.
As a general rule the maximum reduction for most materials is__________
a)
0.5
b)
0.55
c)
0.4
d)
0.45
13.
D=√(d^2=4dh-0.5R) is the algebraic formula to calculate the blank diameter when d/r ratio is____________
a)
20 and more
b)
between 15-20
c)
between 10-15
d)
below 10
14.
D=√(d^2=4dh-R) is the algebraic formula to calculate the blank diameter when d/r ratio is________________
a)
20 and more
b)
between 15-20
c)
between 10-15
d)
below 10
15.
In the formula, D=√(d^2=4dh-R), R is__________
a)
Radius of the punch
b)
Radius of the die
c)
corner radius
d)
radius of the cup
16.
In graphical method of blank development the hypotenuse constructed is given by ________
a)
h^2+X
b)
h+d/2
c)
h+d
d)
h=d/4
17.
D=√(d-2r)^2+4d(h-r)+2pr(d-____r) fill in the blank
a)
0.5
b)
0.6
c)
0.7
d)
0.8
18.
D=√(d-2r)^2+4d(h-r)+2pr(d-0.7r), is the formula used to calculate the blank diameter when d/r is_________
a)
20 and more
b)
between 15-20
c)
between 10-15
d)
below 10
19.
Choose the correct formula to be used if the cup dia is 65mm and the cup height is 75mm and the corner radius is 3.5mm________
a)
D=√(d^2=4dh-0.5R)
b)
D=√(d^2=4dh-R)
c)
D=√(d-2r)^2+4d(h-r)+2pr(d-0.7r)
d)
D=√(d^2+4dh)
20.
In general if D/s ratio is <or= _________, blank holding force is not required.
a)
40-45
b)
45-50
c)
50-55
d)
55-60
21.
In general if________ ratio is <or= 45 to 50, blank holding force is not required.
a)
d/D
b)
D/d
c)
d/r
d)
D/s
22.
The blank holder uses about ______ of the capacity of the press
a)
one-third
b)
one-forth
c)
two-third
d)
one-sixth
23.
The blank holder pressure can be calculated from the _______
a)
pressure
b)
drowing
c)
graph
d)
cutting force
24.
Blanking holder force = blank holder pressure X _______.
a)
clamping force
b)
blank holder area
c)
length of the area
d)
holding force
25.
Total drawing force= X x Drawing force, where X is______________
a)
Blank holding pressure
b)
Blank holding force
c)
Blank holding factor
d)
None of these
26.
Too large clearance will result in _______ of the component
a)
wrinkling
b)
folding
c)
tearing
d)
low clamping force
27.
Too small clearance will result in _______ of the component
a)
low clamping
b)
folding
c)
tearing
d)
wrinkles
28.
The formula to calculate clearance for deep drawing steels is___________
a)
s+(.0.02x√(10s))
b)
s+(.0.04x√(10s))
c)
s+(.0.07x√(10s))
d)
s+(.0.08x√(10s))
29.
To prevent excessive thinning of the cup the punch nose radius is made ______time of the metal thickness.
a)
4 to 10s
b)
5 to 6s
c)
3 to 9s
d)
4 to 8s
30.
______ is provided to control the material flow.
a)
clamping force
b)
Draw beads
c)
grooving
d)
heat
31.
A single draw bead is placed around the _____side.
a)
die core
b)
top plate
c)
bottom plare
d)
die cavity
32.
Airvent is provided to eliminate _______ .
a)
oil
b)
flash
c)
aie pockets
d)
water
33.
In drawing operation the metal flows from the ____ face .
a)
die
b)
forming
c)
punch
d)
none
34.
Aqueous solution of non oil lubricants containing some suspended solid are called ______.
a)
oiling
b)
emulsions
c)
friction
d)
lubrication
35.
Lubricants containing oil and solid substances are used for ______
a)
Bending
b)
Curling
c)
Severe draws
d)
Embossing
36.
Roll coating in drawing is used for_______
a)
Lubricating
b)
Coating
c)
Impregnating
d)
Depositing
37.
The ratio h/H of low carbon Steel is ______.
a)
1.3
b)
1.4
c)
1.5
d)
1.6
38.
The ratio h/H of Tin is ______.
a)
1.2
b)
1.5
c)
1.4
d)
1.3
39.
Square boxes can can be drawn to a depth of approximately ____ of the width.
a)
0.65
b)
0.7
c)
0.8
d)
0.85
40.
A part can be draw in one station to a depth of ______ time the corner radius.
a)
5 to 7
b)
4 to 7
c)
3 to 4
d)
4 to 6
41.
______ occur at the edge of the blank.
a)
wrinkles
b)
puckers
c)
tearing
d)
punch
42.
______ appear on only one part of the blank.
a)
punch
b)
tearing
c)
puckers
d)
wrinkles
43.
In reverse drawing the lower die is mounted on the ______.
a)
bottom
b)
top
c)
press bed
d)
die side
44.
______ is the method of redrawing the wall thickness and to improve the surface finish.
a)
shaving
b)
forming
c)
embossing
d)
Ironing
45.
In ironing process E1 = _______
a)
t1-t2
b)
t0-t1
c)
t2-t3
d)
s1-s2
46.
In eyelet drawing tool is similar to ______ tool.
a)
compound
b)
combination
c)
progressive
d)
bending
47.
About ____ of observation are expected to lie within the band of +1αsigma
a)
0.6537
b)
0.7326
c)
0.7188
d)
0.6827
48.
About ____ of observations are expected to lie eithin the band of +2αsigma.
a)
0.7629
b)
0.5568
c)
0.9545
d)
0.9744
49.
About ____ of observations are expected to lie eithin the band of +3αsigma.
a)
0.7629
b)
0.5568
c)
0.9545
d)
0.9973
50.
In_____ tendency, most of the observation enter a particular region.
a)
central
b)
lower
c)
higher
d)
none
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