Multiple Choice Questions on Plastic Moulding
15- In which of the following a die is used
(A) Compression moulding
(B) Injection moulding
(C) Extrusion moulding
(D) All of the above
16- Which of the following items are produced by Extrusion moulding?
(A) structural shapes
(B) Pipes
(C) coated electrical wires
(D) all of the above
17- The correct sequence of sections in extrusion moulding machine is
(A) Feed section – Compression section – Metering section
(B) Feed section – Metering section – Compression section
(C) Compression section – Feed section – Metering section
(D) Metering section – Feed section – Compression section
18- In extrusion moulding, the function of screen pack is to
(A) Straighten flow of polymer melt
(B) Filter out contaminants
(C) Build pressure in metering section
(D) All of the above
19- Coating of electrical wires is done with
(A) compression moulding
(B) injection moulding
(C) extrusion moulding
(D) all of the above
20- Which of the following is not a part of Injection moulding machine?
(A) Ejector pins
(B) Sprue
(C) Nozzle
(D) Breaker plate
21- Plastic bottles are manufactured by
(A) Compression moulding
(B) Transfer moulding
(C) Blow moulding
(D) All of the above
22- A starting tube in blow moulding is known as
(A) harison
(B) parison
(C) garison
(D) none of the above
23- Production rate of Injection Blow Moulding method is ___ of Extrusion Blow Moulding
(A) lower than that
(B) higher than that
(C) equal
(D) depends upon machine
24- The process of passing the feedstock through a series of rolls to reduce thickness to desired gage is known as
(A) calendering
(B) embossing
(C) spinning
(D) none of the above
25- The following welding of plastics is similar to that of oxy-acetylene welding in metals
(A) Hot plate welding
(B) Hot gas welding
(C) Vibration welding
(D) Spin welding
26- In Ultrasonic welding of plastics, heat is produced due to
(A) surface friction
(B) inter-molecular friction
(C) both (A) and (B)
(D) torch
27- In Friction (spin) welding of plastics
(A) one part is stationary, other rotates
(B) both parts rotate
(C) both parts are stationary
(D) depends upon types of plastics to be joined
28- Following is (are) the advantage(s) of Vibration welding of Plastics.
(A) Join dissimilar shaped materials
(B) simplicity of tooling
(C) high production rates
(D) all of the above
ANSWERS:
15-(C), 16-(D), 17-(A), 18-(D), 19-(C), 20-(D), 21-(C), 22-(B), 23-(A), 24-(A), 25-(B), 26-(C), 27-(A), 28-(D)