Rajasthan Technical Education Second Year Paper 2016 – Plastic Processing I

Rajasthan Technical Education Second Year Paper 2016 – Plastic Processing I

The engineering speciality used to convert plastic materials into useful end products is
(a) Engineering plastics
(b) Processing of plastics
(c) Manufacturing of plastics
(d) Compounding of plastics

Which one is NOT a plastic processing technique ?
(a) Thermoforming
(b) Calendering
(c) Sintering
(d) Reaction injection Moulding

Processing technique utilised for production of hollow plastic products is
(a) Fibre spinning
(b) Blow moulding
(c) Compression moulding
(d) Transfer moulding

The significant elements of injection moulding machine are
(a) Injection unit
(b) Clamping unit
(c) Mould & Machine controls
(d) All these

The mechanism designed in the mould to assist releasing the formed part is
(a) Ejector pins
(b) Nozzle
(c) Toggle
(d) Runner

‘To and fro motion ‘ of injection unit is known as
(a) Clamping action
(b) Reciprocating action
(c) Packing
(d) None of the above

Major advantage of screw plasticizing are
(a) Melting by shearing action
(b) Heat is applied uniformly
(c) Better mixing
(d) All these

In injection moulding the device which provides leak proof connection from injection cylinder to the mould is
(a) Nozzle
(b) Toggle
(c) Plunger
(d) Bush

The problem caused by the material solidifying before it completely fills the cavity is
(a) Sink marks
(b) Short shots
(c) Flash
(d) Voids

Brittleness is caused by
(a) Insufficient packing
(b) Insufficient injection pressure
(c) Degradation of the material
(d) None

The compacting of a plastic material and the forcing of it through an orifice in a continuous fashion is
(a) Fibre spinning
(b) Extrusion
(c) Rotational moulding
(d) Comrpession moudling

An opening through the barrel wall to permit the removal of air and volatile matter is
(a) Vent
(b) Hopper
(c) Jacket
(d) Cavity

The ratio of feed to metering section flight depth is known as
(a) L/D ratio
(b) Compression ratio
(c) Feed ratio
(d) None

The forward motion of the melt stemming from the conveying action of the screw with no flow restrictions is
(a) Drag flow
(b) Pressure flow
(c) Leakage flow
(d) Laminar flow

The helical ridge formed by the machining of the channel (of an extruder screw) is called
(a) Lead
(b) Screw flight
(c) Pitch
(d) Flight depth