WorksheetsMOULD-100
Total questions: 100
Worksheet time: 50mins
Name
Class
Date
1.
_____________ is a very important step in producing a mould that works properly and a
part that is functional and visually attractive.
a)
Mould polishing
b)
Release
c)
mirror finishing
d)
rough finishing
2.
Polishing insures that the part is not damaged during ________.
a)
finishing
b)
texturing
c)
appearance
d)
ejection.
3.
_______ is the ability of the mould to eject the component.
a)
finishing
b)
texturing
c)
Release
d)
mould polishing
4.
_________ is the most basic of all finishes.
a)
Rough finishing
b)
Mirror finishing
c)
pebbly textures.
d)
diamond finishing
5.
Sand blast or glass bead produces a________ finish.
a)
diamond finishing
b)
matte
c)
mirror finishing
d)
Release
6.
A mirror finish is called________ finish.
a)
texture
b)
diamond
c)
matte
d)
Rough finishing
7.
There are_______ basic diamond finishes.
a)
six
b)
two
c)
three
d)
one
8.
The finer the______, the finer the finish needs to be.
a)
polish
b)
Release
c)
finish
d)
texture
9.
A high shine or ________ is necessary for optical or highly reflective parts.
a)
smooth finish
b)
#1 diamond
c)
#3 diamond
d)
matte finish
10.
The finish should be vertical, from bottom of the cavity or core to the parting surface to aid in the_________.
a)
ease of ejection
b)
diamond finishing
c)
mould polishing
d)
texturing
11.
It is considered that all moulding surfaces of a mould must be provided with a _________.
a)
smooth finish
b)
mirror polish
c)
polishing
d)
texturing
12.
______ is replacing one set of scratches with finer set of scratches until the desired finish is reached.
a)
moulding
b)
moulding shop
c)
polishing
d)
stonning
13.
_______ is the measurement of the depth of the scratches.
a)
RMS values
b)
LBM
c)
RPM values
d)
texturing
14.
Hand tools are used to remove___________ left over by machining operations .
a)
RMS values
b)
cutter marks
c)
texturing
d)
ejection marks
15.
Stone finishing is also called ________
a)
mirroe finishing
b)
polishing
c)
moulding
d)
stoning
16.
Diamond Finishing is done at a brush speed of________
a)
4000 to 6000 RPM
b)
2000 to 3000 RPM.
c)
3000 to 5000 RPM
d)
5000 RPM
17.
Buffing is done at a brush speed of________.
a)
5000 RPM
b)
2000 to 3000 RPM.
c)
3000 to 5000 RPM
d)
4000 to 6000 RPM
18.
The thichness of the_______ plating should be grater than 0.025mm.
a)
plastic
b)
electro
c)
Chrome
d)
ejector
19.
A high shine diamond is necessary for optical and highly_____________parts.
a)
opaque
b)
slippery
c)
accurate
d)
Reflecting
20.
The “OLD” SPI which has __ finishes
a)
6
b)
12
c)
10
d)
9
21.
The “NEW” SPI which has __ finishes
a)
6
b)
12
c)
10
d)
9
22.
Non slippery and non reflective surfaces are produced by______________.
a)
Acid burning
b)
Filing
c)
Pickling
d)
Sand blasting
23.
The usual range of Chrome plating coating thickness is______ microns
a)
0 to 5
b)
1 to 50
c)
50 to 100
d)
1 to 100
24.
Consistency in the quality of product would depend on the ______ of mould.
a)
quality
b)
quantity
c)
weight
d)
appearance
25.
Moulds in use should function well to the maximum possible production __________.
a)
design
b)
practice
c)
marks
d)
quantities
26.
A mould properly designed and made may not remain proper, unless kept and ___________ in a proper manner.
a)
polished
b)
damaged
c)
maintained
d)
scraped
27.
Maintenance of moulds is important practical aspects of a _________.
a)
house keeping
b)
moulding shop
c)
machining
d)
buffering
28.
Mould history card reveals the ________ a lot of information about the performance and capabilities of the shop floor personnel.
a)
management
b)
mould shop
c)
operator
d)
worker
29.
There are_____ levels of maintenance activities and one breakdown maintenance.
a)
three
b)
four
c)
five
d)
one
30.
All water lines should be________ and blown free of all residual water to avoid build up of rust due to standing water.
a)
drained
b)
washed
c)
wet
d)
plastered
31.
Inspection Maintenance is done for every______ cycles and also at the end of production run.
a)
10000
b)
20000
c)
100000
d)
100
32.
General Maintenance is done after _______ cycles of moulding.
a)
100000
b)
10000
c)
20000
d)
100
33.
Major Maintenance is done after _______ cycles of moulding.
a)
20000
b)
1000
c)
100000
d)
250000
34.
___________Maintenance is done unexpectedly when an accident occurs to the mould is in production.
a)
break down
b)
ocational
c)
preventive
d)
regular
35.
After hard machining Mould Maker should send the steel for ___________
a)
hardening
b)
stress relieve
c)
processing
d)
quenching
36.
Complete information of a mold is recorded in _____________.
a)
History sheet
b)
Specification sheet
c)
Maintenance sheet
d)
Instruction sheet
37.
Information of a mould’s defect and remedies taken are recorded in ___________________.
a)
History card
b)
Specification sheet
c)
Maintenance card
d)
Instruction sheet
38.
_________ materials were only compression moulded or transfer moulded
a)
Thermoset
b)
thermoplast
c)
plastic
d)
rubber
39.
The most popular type of machine used for injection moulding Thermoset is the____________ machine.
a)
double plunger
b)
compression moulding
c)
line screw
d)
hand mould
40.
Mould of thermoset material must be heated to __________ Celsius.
a)
300 to 650
b)
100 to 200
c)
200
d)
130 to 300
41.
Mould up to 50mm thickness are heated by conduction heat from _________.
a)
current
b)
hot plates
c)
electricity
d)
plates with water holes
42.
Larger moulds are heated directly by___________.
a)
hot plastic
b)
electricity
c)
hot plates
d)
moulding machine
43.
To minimize the wear, the sprue bush must be hardened to_____________HRC.
a)
62
b)
55
c)
60
d)
48
44.
Runners should preferably be___________ and about 6 mm in diameter.
a)
trepesoidal
b)
fully round
c)
half round
d)
square
45.
Ejector pins should have surface hardness of about______ HRC and should be of as large as possible.
a)
48
b)
60
c)
55
d)
62
46.
Thermoset materia is usually in the range of _____ celsius, approximately 30 celsius higher than barrel temperature.
a)
250
b)
100-200
c)
130-300
d)
30
47.
Dwell or hold on pressure is _________ of the injection pressure.
a)
one forth
b)
twise
c)
Half
d)
one sixth
48.
In plasma process air at low pressure through an electric discharge is used to change the _______and_______ properties of plastics
a)
small and big
b)
up and down
c)
thermal and corrosive
d)
physical and chemical
49.
In chemical treatment products are dipped in acids resulting in an_________ surface which makes it receptive to paint.
a)
smooth
b)
clean
c)
etched
d)
mirror finish
50.
Plating is done on many plastics to provide a hard wear and _______ - resistant surface.
a)
chemical
b)
corrosion
c)
hardness
d)
damage
51.
The __________ material cannot be electro plated.
a)
PS
b)
ABS
c)
PC
d)
Acetyl
52.
The ____________ material can be electro plated.
a)
ABS
b)
PS
c)
HDPE
d)
PP
53.
In vacuum metalizing of plastics the layer thickness is _________ micron.
a)
5
b)
15
c)
10
d)
1
54.
_________________ is a process where by a bright thin film of metal is deposited on the surface of plastic with high vacuum.
a)
Vacuum metalizing
b)
Vacuum hardening
c)
Vacuum machining
d)
Vacuum discharge machining
55.
The cavity housing houses the cavity insert which is clamped within the housing by means of the_______.
a)
allen screws
b)
grub screws
c)
dowel
d)
angle iron
56.
The sprue bush of die casting mould is made up of________
a)
HCHCR
b)
OHNS
c)
HDS
d)
HSS
57.
The recommended hardness for guide bush in die casting die is ___________.
a)
40 – 45 HRC
b)
60 – 62 HRC
c)
52 – 55 HRC
d)
38 – 42 HRC
58.
The push back pin of die casting mould is made up of________
a)
HCHCR
b)
OHNS
c)
HDS
d)
HSS
59.
The metal used for manufacturing die casting die is ___________.
a)
CRCA
b)
HCHCR
c)
OHNS
d)
H13
60.
The Ejector pin of die casting mould is made up of________
a)
HCHCR
b)
OHNS
c)
HDS
d)
HSS
61.
The core and cavity of die casting mould is made up of________
a)
HDS
b)
HCHCR
c)
HSS
d)
OHNS
62.
Moving core design is adopted when the casting has __________
a)
Ribs
b)
External thread
c)
Undercuts
d)
Holes
63.
The ejector plate is connected with the machine through ________________.
a)
Ejector rod
b)
Ejector bush
c)
Support pillar
d)
Ejector grid
64.
The most common and simple type of ejection in die casting is _____________.
a)
Pin ejection
b)
Blade ejection
c)
Valve ejection
d)
Sleeve ejection
65.
The material used to manufacture spreader is _________________.
a)
HDS
b)
HCHCR
c)
HSS
d)
OHNS
66.
The gate area should not be less than _____ of nozzle exit area.
a)
half
b)
0.6
c)
0.5
d)
0.4
67.
Air vents with total entrance areas up to_____ of gate areas are recommended
a)
0.2
b)
0.4
c)
0.5
d)
0.4
68.
The gate velocity of metal in die casting process is expressed in ____________ units.
a)
m/s
b)
m/min
c)
ft/min
d)
mm/s
69.
The nozzle is basically a heated pipe connecting gooseneck to the ___________.
a)
core
b)
cavity
c)
sprue bush
d)
bolster
70.
The metal velocity through the nozzle should not exceed _____.
a)
30m/s
b)
50m/s
c)
20m/s
d)
45m/s
71.
The runner which gives best flow efficiency and minimize thermal losses is ______________.
a)
Round
b)
Square
c)
Half round
d)
Trapezoid
72.
The ______________ type of gate gives zero flow angles.
a)
Paddle gate
b)
Fan gate
c)
Edge gate
d)
Pin gate
73.
If air vents and /or over flows are __________ with flash they may also contribute to the problem.
a)
full
b)
clogged
c)
disturbed
d)
stopped
74.
Castings used for ornamental parts will usually require a ______ free surface.
a)
scratch
b)
heat
c)
smooth
d)
chill
75.
Severe chill is similar to cold shut but it will cover a ______ surface of casting instead of being a single line.
a)
small
b)
medium
c)
large
d)
similar
76.
_______________ depressions on the casting surface are called sink marks
a)
smooth
b)
Shallow smooth
c)
formed
d)
down
77.
Cold shut is a _________________ type of defects
a)
Miscellaneous defects
b)
Hot type defects
c)
Cold type defects
d)
Mecahanical defects
78.
Flow lines is a _________________ type of defects
a)
Miscellaneous defects
b)
Hot type defects
c)
Cold type defects
d)
Mecahanical defects
79.
Flow lines can usually be reduced or eliminated by increasing the ______________, metal temperature or both.
a)
pressure
b)
mouldind pressure
c)
die temperature
d)
time
80.
Soldering may be caused by excessive metal temperature, incorrect___________ or insufficient die release material.
a)
die temperature
b)
time
c)
pressure
d)
lead time
81.
Castings may _______ from internal stress or from abnormal pressure during ejection.
a)
bulge
b)
eject
c)
crack
d)
expand
82.
_____________ vents or excessive die release may cause large volumes of gas to become entrapped in the die.
a)
Clogged
b)
wet
c)
flushed
d)
big
83.
Cracks is a _________________ type of defects.
a)
Miscellaneous defects
b)
Hot type defects
c)
Cold type defects
d)
Mecahanical defects
84.
Soldering is a _________________ type of defects.
a)
Miscellaneous defects
b)
Hot type defects
c)
Cold type defects
d)
Mecahanical defects
85.
Shallow smooth depressions on the casting surface are called __________.
a)
casting
b)
bulging
c)
buffing
d)
sink marks
86.
Large holes in the castings are called ________.
a)
cavity
b)
porosity
c)
breathing
d)
holes
87.
Scale is a _________________ type of defects
a)
Miscellaneous defects
b)
Hot type defects
c)
Cold type defects
d)
Mecahanical defects
88.
Blisters is a _________________ type of defects
a)
Miscellaneous defects
b)
Hot type defects
c)
Cold type defects
d)
Mecahanical defects
89.
A surface bubble caused by gas expansion is known as ____________________.
a)
Porosity
b)
Flash
c)
Blister
d)
Sink marks
90.
In some cases, luxury and comfort are the prime considerations that______ becomes secondary.
a)
cost
b)
length
c)
size
d)
marks
91.
New models are made and then presented to __________ for evaluation and approval.
a)
house keeping
b)
document
c)
management
d)
worker
92.
Product design is one of the fundamental elements of ___________ policy.
a)
operator
b)
workers
c)
management
d)
house keeping
93.
___________ is the commonest material for scale models.
a)
plastic
b)
clay
c)
mud
d)
Plaster
94.
A ____________ is still the best technique to improve the level of confidence of the designer for new products.
a)
prototype
b)
modeling
c)
plastry
d)
demonstration
95.
Proper finishing of the mould is important for the __________ of component.
a)
Release
b)
Injection
c)
Feeding
d)
None of above
96.
A mirror polished molding surface is used for__________________.
a)
Easy flow of molten plastic material into the mould
b)
Good transparency for clear plastic material
c)
a. Glazing attractive surface for a commercial product
d)
All the above
97.
A ___________ finish is also called as diamond finish.
a)
Mirror
b)
Draw
c)
Textured
d)
None
98.
The ability of mould to eject the component is ______________.
a)
Molding
b)
Release
c)
Texturing
d)
All of the above
99.
The basic mold finish is ______________.
a)
Texture
b)
Release
c)
Draw stone
d)
All of the above
100.
Non slippery and non reflective surfaces are produced by______________.
a)
Filing
b)
Pickling
c)
Acid burning
d)
Sand blasting
100 %
