Rajasthan Polytechnic Third Year Paper 2016 – Finishing and Decoration of Plastics

Rajasthan Polytechnic Third Year Paper 2016 – Finishing and Decoration of Plastics

Plastic objects may be
(a) Transparent
(b) Transluscent
(c) Opaque
(d) All these

Driving force of the levelling process is
(a) Surface tension
(b) Viscosity
(c) Thickness
(d) None of these

Surface wetting means
(a) Levelling of surface
(b) Displacement of solid from solid-air-interface
(c) Treatement of surface
(d) Displacement of air from solid-air interface

Surface crazing and cracking are caused by
(a) Coating
(b) Residual internal stresses
(c) Filling
(d) Polishing

Scanning electron microscope uses highly focused
(a) Visible light
(b) LASER
(c) Electron beam
(d) X-ray

Flame treatment of plastic surfaces is the most often used process to improve
(a) Ink adhesion
(b) Washing
(c) Tinting
(d) Etching

Gas phase plasma is a
(a) First state of matter
(b) Second state of matter
(c) Third state of matter
(d) Fourth state of matter

Easiest method of applying a coating is
(a) Flow coating
(b) Dip coating
(c) Curtain coating
(d) Roll coating

In a conventional air atomised spray gun atomization is achieved by means of
(a) Cnetrifugal force
(b) Elestrostatic force
(c) Compressed air
(d) None of these

Flexographic printing has outstanding advantages in
(a) Efficiency
(b) Flexibility
(c) Both (a) & (b)
(d) None of these