Rajasthan Polytechnic Third Year Paper 2016 – Plastic Processing II

In calendering process, discolouration of plastic product occurs due to
(a) Overheating
(b) Incomplete gelation
(c) Both (a) & (b)
(d) None of the above

In which Calender, the offset roll is on the bottom?
(a) L-Calender
(b) Inverted L-Calender
(c) F-Calender
(d) Z-Calender

Blow moulding is used for manufaturing of following
(a) hollow products
(b) solid products
(c) hollow and solid products
(d) None of the above

The rotating mould is found in
(a) injection moulding
(b) transfer moudling
(c) extrusion
(d) rotational moulding

The method of shaping thermoplastic sheet is called
(a) Calendering
(b) Thermoforming
(c) Extrusion
(d) Injection moulding

Calender rolls are
(a) steam heated
(b) electrically heated
(c) either (a) or (b)
(d) None of the above

Calendering process is
(a) Continuous
(b) Batch
(c) either (a) or (b)
(d) None of the above

When density of sheet of specific plastic increases
(a) tensile strength decreases
(b) tensile strength increases
(c) tensile strength remains same
(d) None of the above

Large optical plastic lens are made by
(a) extrusion
(b) thermoforming
(c) compression moulding
(d) Injection moulding

Bakelite is
(a) Phenol farmaldehyde
(b) Melamine formaldehyde
(c) Urea formaldehyde
(d) None of the above

Parison is made in
(a) thermoforming
(b) injection moulding
(c) blow moulding
(d) None of the above

In vaccum forming process
(a) Vacuum is used
(b) Compressed air is used
(c) Both (a) & (b)
(d) None of the above