Deck 8: Plastic Manufacturing Processes

Question 1

The process of electromagnetic forming does not require any kind of lubrication.

Answer 1

True

Question 2

Which of the following is the main advantage of using the electromagnetic forming process?

A)high speed
B)low maintenance
C)applicable to all materials
D)no spring-back

Answer 2

no spring-back

Question 3

What is the maximum pressure required in a compression molding process?

A)35 mpa
B)40 mpa
C)45 mpa
D)50 mpa

Answer 3

50 mpa

Question 4

In compression molding, the curing time does not depend on which of the following factors?

A)material
B)curing temperature
C)geometry
D)thickness

Question 5

What is the maximum curing time required in a compression molding process?

A)2 minutes
B)3 minutes
C)4 minutes
D)5 minutes

Question 6

What is the minimum pressure required in a transfer molding process?

A)20 mpa
B)40 mpa
C)50 mpa
D)70 mpa

Question 7

Speed of production in transfer molding is higher than that of compression molding?

Question 8

Thermosetting plastics are generally used for making products of high strength and rigidness.

Question 9

Which of the following types of molecular structure present in thermosetting polymers?

A)linear polymers
B)branched polymers
C)cross-linked polymers
D)network polymers

Question 10

Polyethylene, polypropylene and polyvinyl chloride (PVC) are the main example of thermosetting polymers.

Question 11

Polyurethane plastics are highly reactive to chemical compounds due to lack of elasticity in these plastics.

Question 12

Phenolic plastics can also be used as binder for holding plies of wood in making of plywood.

Question 13

Thermosetting plastics can be used for manufacturing of windshield for airplane.

Question 14

How is the die used in injection molding cooled?

A)oil
B)air
C)water
D)contact with cold surface

Question 15

How does the piston in the clamping unit move?

A)hydraulic energy
B)pneumatic energy
C)heat energy
D)suction

Question 16

Which of the following material is not made by injection molding?

A)nuts
B)tubes
C)car handles
D)electrical fittings

Question 17

What is the minimum pressure allowed to be given to the injection molding process?

A)90 mpa
B)100 mpa
C)140 mpa
D)170 mpa

Question 18

The barrel is used for the opening and closing of the mold.

Question 19

In blow molding, to inflate soft plastic, which medium is used?

A)air
B)water
C)oil
D)alcohol

Question 20

Which of the following plastics is not used in blow molding?

A)terephthalate
B)polypropylene
C)polythene
D)pvc

Question 21

What is the minimum air pressure required in the blow molding process?

A)350 kpa
B)400 kpa
C)450 kpa
D)500 kpa

Question 22

What can be the maximum pressure to be given to plastic for blow molding process?

A)700 kpa
B)750 kpa
C)800 kpa
D)850 kpa

Question 23

Which of the following is not a type of blow molding process?

A)injection blow molding
B)extrusion blow molding
C)multi-smaller blow molding
D)multi-larger blow molding

Question 24

What is the minimum thickness required by the plastic for vacuum forming?

A)0.125 mm
B)0.25 mm
C)0.375 mm
D)0.5 mm

Question 25

What is the maximum thickness that can be allowed for a plastics sheet in a vacuum forming process?

A)3 mm
B)3.1 mm
C)3.2 mm
D)3.3 mm