blow molding

1. 1) Following is not part of compression mould.
a) Loading chamber
b) Core
c) Guide Pin
d) Sprue Bush
2) Following is the type of transfer mold
a) Split cavity mould
b) Three plate mould
c) Semi-positive mould
d) Loose plate mould
3) Following is type of compression mould
a) Flash mould
b) semi positive mould
c) Positive mould
d) All of the above
4) Following material is used in Pot type transfer mould for making moulding.
a) PE
b) PF
c) PS
d) PVC
5) The flash type mold produces a product __________.
a) High Density
b) Low density
c) Moderate Density
d) None of the above
6) Following are the parts of pot type transfer mold
a) Cull
b) Runner
c) Sprue
d) All of the above
7) Following type of runner is commonly used in transfer mold
a) Round Runner
b) Trapezoidal runner
c) Modified Trapezoidal runner
d) None of the above
8) Identify the following type of transfer molding
a) Plunger Transfer mold
b) Auxiliary ram type transfer mold
c) Pot type transfer mold
d) Integral pot type transfer mold

2. 9) Identify the mold shown in fig
a) Semipositive mold
b) flash mold
c) Positive mold
d) hand transfer mold
10) In compression mold the most efficient heating system is accomplished by
a) Hot water
b) Steam
c) Electrical
d) None of the above
11) In semipositive mold the direction of flash is
a) Vertical and horizontal
b) Vertical
c) Horizontal
d) None of the above
12) Suggest the compression mould for producing product with high density with less tolerance.
a) Flash mold
b) Positive mold
c) semi positive vertical flash mold
d) None of the above
13) Suggest the mold for producing close tolerance thermoset products used as electrical
switch..
a) Positive Mold
b) Three plate mould
c) Pot type transfer mold
d) Semipositive mold
14) The difference between auxiliary ram type transfer mold and pot type transfer mold is
__________.
a) Sprue is present
b) Cull pick up is present
c) Both sprue and cull pick up are absent in auxiliary mold
d) Runners are absent in auxiliary type
15) . Bulk factor is defined as ____________.
a) It is ratio of the volume of loose plastic powder to the volume of molding.
b) It is ratio of the volume of loose plastic powder.
c) it is ratio of the volume of molding.
d) It is ratio of the volume of molded product to the moulding

3. 16) Compression molds has following limitation.
a) Not produce high density product..
b) Not suitable for thermoset material..
c) Not able to produce medium size..
d) Not suitable for molding of intricate section.
17) How many parting surfaces are seen in following mold.
a) 1.
b) 4.
c) 3.
d) 2
18) Identify the following transfer mold shown in fig..
a) Pot type transfer mold.
b) accordion type transfer mold.
c) ram type transfer mold.
d) Auxiliary ram type mold
19) Identify the missing name in following fig.
a) Cull pick up.
b) Sprue.
c) Land.
d) Runner
20) In transfer mold molding material is used in the form of ___________..
a) Powder.
b) pallets.
c) Preform.
d) Moulding powder

4. 21) Match the following pairs.
a) 1.-d), 2.-c), 3-b), 4-a).
b) 1.-b, 2.-a), 3-d), 4-c).
c) 1.-a), 2.-d), 3-b), 4-c).
d) 1.-d), 2.-a), 3-b), 4-c)
22) Select appropriate mold for manufacturing of intricate plastic part with inserts.
a) Three plate injection mold.
b) Flash type compression mold.
c) Semipositive compression mold.
d) Auxiliary ram type transfer mold.
23) Suggest the mold for molding of Product with fragile inserts.
a) Pot type transfer mold.
b) Auxiliary ram type transfer mold.
c) ram type transfer mold.
d) loose plate transfer mold
24) . The disadvantage of fully positive compression mould is
a) Blisters may formed on the surface of the molding.
b) Difficulty in ejecting the article.
c) A correctly measured charge must be used.
d) All of the above
25) The function of leader pin in transfer mold is _____________.
a) To achieve alignment between core and cavity.
b) For Proper molding of material.
c) To achieved good molding.
d) For proper cooling of material
26) Following are the applications of blow molded articles.
a) Packaging of milk
b) Automotive fuel tanks
c) Drums for Chemical industries
d) All of the above
27) Following are the thermoplastic materials used in blow molding.
a) Polyethylene
b) Polypropylene
c) PVC
d) All of the above

5. 28) Identify the following parison die shown in fig.
a) Axial flow parison die
b) cross head die
c) Straight through die
d) Radial flow parison die
29) Identify the missing name.
a) Neck finish, waist
b) neck. waist
c) pinch off
d) Neck, body
30) Which of the following plastics is not used in blow molding?.
a) Phenol formaldehyde
b) melamine formaldehyde
c) urea formaldehyde
d) All of the above
31) Air is used to blow the parison in blow mold it performs the following functions.
a) It expands the parison against mold.
b) aids in cooling the parison.
c) It gives colour to the parison
d) it determines the thickness of the parison
32) Following is the significance of venting in blow mold.
a) entrapped air in the mold prevents good contact between the parison and mold cavity
wall.
b) entrapped air causes surface roughness.

6. c) the air between the parison and the mold must be expelled completely. .
d) entrapped air prevent or delayed the efficient cooling
33) Following is the type of venting.
a) Parting Line venting
b) round line venting
c) straight line venting
d) chopped venting
34) Following materials are used for the construction of blow mold
a) Aluminum alloy
b) Beryllium copper
c) Steel
d) All of the above
35) In which following blow mold preform is required.
a) Injection blow mold
b) extrusion blow mold
c) blow mold
d) None of the above
36) One Pinch off design is shown in the given fig. State what is wrong with design.
a) No Land provided, hence creat knife edge pinch off
b) Pinching of parison will good
c) no radius is provided at edge
d) All of the above
37) Pinch off is the part of mould that ___________ the ends and the interior portions of the
parison and also ________it to facilitate its removal..
a) Cut, weld
b) weld, cut
c) prepare, weld
d) weld, weld
38) The plastic melt coming out from die in case of blow molding is called as ________.
a) Plastic Tube
b) Plastic material
c) Parison
d) None of the above
39) The ratio of blow mold cavity diameter to the parison diameter is called as ________.
a) Ratio
b) Blow-ratio
c) Blow
d) Parison blowing
40) Following are the material which can be oriented.
a) PP

7. b) PET
c) PAN
d) All of the above
41) Following are the requirements of pinch off design
a) They should have good thermal conductivity for rapid cooling and toughness for long
production run.
b) They should have good toughness and strength
c) They should have good cooling effect
d) They should have good smoothness and toughness
42) Identify the given fig a) and b) and state which design is good for bearing load and
contribute stress cracking.
a) a)
b) b)
c) c)
d) d)
43) Identify the mold shown in the fig.
a) Extrusion blow mold
b) Extrusion stretch blow mold
c) Injection blow mold
d) injection stretch blow mold
44) Identify the process shown in the given fig.
a) Injection blow molding
b) Extrusion stretch blow molding
c) blow molding

8. d) Extrusion blow molding
45) Identify the type of venting shown in given fig.
a) Parting Line venting
b) Core venting
c) Pinch off block venting
d) slotted or screen type vent
46) In fig a) molded piece has good welding of parison while in b) the molded piece has groove
and weak weld line at pinch off area. Select proper reason behind this for both fig a) and fig
b) design.
a) In fig a) wel design pinch off with land is used while in fig b) pinch off without land is
used (Knife Edge)
b) in fig a) less air pressure is used b) High air pressure is used.
c) Both A and B has same design it is because of material
d) None of the above
47) The function of pinch off in blow mold is _________________.
a) Squeeze and weld the parison together
b) To give aesthetic appearance to the moulding
c) To give good shape to bottle
d) to stretch the parison
48) The guage pressure used to inflate parison is between ___________.
a) 0.21 to 2.1 Mpa
b) 0.31 to 2.1 Mpa
c) 0.41 to 1.1 Mpa
d) 1.21 to 2.1 Mpa
49) The preform for stretch blow molding is generally produce by _______.
a) Two plate mould
b) Hot Runner mold
c) Three Plate Mould
d) Semipositive mold
50) While stretching of parison or preform in stretch blow mold the container produce has
following properties.
a) excellent mechanical strength and barrier property
b) Excellent mechanical strength

9. c) Excellent barrier property
d) Excellent chemical and mechanical strength
51) Following is the factors to be consider for design of the die.
a) Die geometry
b) Polymer melt flow
c) Extruder-Die
d) All of the above
52) Heat generated in a conductor due to eddy currents induced by an alternating current which
generates an alternating magnetic field around the conductor is called as ____________.
a) standard Voltage resistance Heating
b) Oil Heating
c) Thermic heating
d) Induction heating
53) Identify the application of the die shown in the fig
a) Blown film, wire and cable coating
b) Plastic chair
c) Profile
d) Plastic bearing
54) Identify the die shown in the fig
a) Cross head die
b) solid section die
c) offset die
d) straight through die

10. 55) Identify the heater shown in the fig.
a) Mica heater
b) Ceramic Heater
c) Cartridge Heater
d) Thermic heater
56) following is the model for melt flow through capillary. State the reasons behind swelling of
melt at exit of tube.
a) because of elastic energy content of melt
b) because of Viscosity of melt
c) due to Material of the melt
d) it is because of temperature of melt
57) For smooth operations of die following requirements are necessary.
a) Melt viscosity must be maintained degradation due to over heating should be avioded
b) The flow of melt should be as smooth as possible and no stagnant areaa
c) Change in cross section should be gradual
d) All of the above
58) Identify the section shown in the fig
a) Die
b) Mandrel
c) Die ring
d) Spider

11. 59) In given capillary model the pressure drop at entry is due to.
a) Due to Viscous dissipation due to converging flow at entry
b) Due to high temperature of melt
c) Due to melt of materal
d) None of the above
60) State missing name indicated by black line in the given fig of extrusion die.
a) Socket headed Screw, Bulge
b) Die ring, Adjusting screw
c) Die bush and Torpedo
d) None of the above
61) The function of die ring is _____________.
a) To hold the die bush
b) To hold the spider section
c) To hold the mandrel
d) To form concentricity
62) The die channel can be consider as made up of _______________ and __________________
in which the angle of convergent is ________.
a) Approach section and forming section, 20 to 60degree
b) Approach section and forming section, 20 to 160degree
c) Approach section and slotted section, 20 to 60degree
d) Entry section and forming section, 120 to 60degree
63) The most common material for fabrication of the die is _________
a) Nickel chromium and high carbon, high chromium steel.
b) Aluminum
c) Stain less with high carbon
d) All of the above

12. 64) ___________ is essentially a streamlined channel which gives an appropriate shape to
polymer melt.
a) Die
b) Stretch mould
c) Mould
d) positive mould
65) For coating of cable and wire following die is used.
a) Cross head die
b) In line die
c) offset die
d) bottom fed dies
66) For coating of paper with plastic material select appropriate die from following.
a) Side fed die
b) T-mainifold die
c) Straight through die
d) bottom fed die
67) For coating very thin wire suggest extrusion die.
a) Side fed die
b) Pressure Die
c) Bottom fed die
d) Tubing die
68) For manufacturing of flat film of PP having width 3m suggest the extrusion die.
a) Straight through die
b) Side feed die
c) Bottom fed die
d) T- manifold die
69) How will you adjust the concentricity between mandrel and die in Pipe and Blown film die.?
e) by die ring
f) by spider
g) by mandrel
h) by adjusting screw
70) Identify the given die shown in fig and state its applications
a) bottom fed die and blown film
b) fed die and blown film
c) side fed die and blown film
d) bottom fed die and cast film

13. 71) In given die what is the function of choker bar.
a) To form uniform thickness.
b) To control the flow of material
c) To form good material
d) To give strength to die
72) In the given die the gap between the lip is adjusted by ___________.
a) Lower and Upper Jaw
b) Lower Jaw
c) By upper jaw
d) All of the above
73) In wire or cable coating die the melt flow channel is located at
a) 30 degree, 45 degree and 60 degree
b) 45degree, 60 degree and 90 degree
c) 30degree, 45degree and 90degree
d) 45degree, 75degree and 90degree
74) The difference between the cast film and blown film is _________________.
a) Blown film = thickness 10 to 250 micron and width 250 to 1000mm and cast film =
thickness up to 0.25mm and width 4000mm.
b) Blown film = thickness 10 to 250 mm and width 250 to 1000mm and cast film =
thickness up to 25mm and width 4000mm.
c) Blown film = thickness 10 to 50 micron and width 250 to 500mm and cast film =
thickness up to 0.25mm and width 4000mm.
d) Blown film = thickness 10 to 250 micron and width 50 to 1000mm and cast film =
thickness up to 0.25mm and width 400mm.