Polyhexamethylene adipamide is also known as______________?
A. Bakelite
B. Nylon-66
C. Epoxy resin
D. Silicone rubber
Polymer Technology
Thermoplastic materials___________________?
Thermoplastic materials___________________?
A. Do not soften on application of heat
B. Are heavily branched molecules
C. Are solvent insoluble
D. None of these
Cross linked polymers are__________________?
Cross linked polymers are__________________?
A. Thermoplastic
B. Thermosetting
C. Either A. or B.
D. Fibres only
Nylon-66 compared to nylon-6 has __________________?
Nylon-66 compared to nylon-6 has __________________?
A. Lower melting point
B. More abrasion resistant properties
C. Higher hardness
D. All A., B. and C.
In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of__________________?
In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of__________________?
A. Cross linked polystyrene
B. Phenol formaldehyde resins
C. Polyesters
D. Polyamides
Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?
Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?
A. Butyl rubber
B. Silicon rubber
C. Nitrile rubber
D. Silicone rubber
_______________ is normally used for the manufacture of refrigerator components and transistor parts?
_______________ is normally used for the manufacture of refrigerator components and transistor parts?
A. Polypropylene
B. Polystyrene
C. Polyester
D. Polyurethane
Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but____________________?
Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but____________________?
A. Polyacrylonitrile
B. Polyamide
C. Saturated polyester
D. Alkyd resin
Styrene butadiene rubber (SBR) is never used for making__________________?
Styrene butadiene rubber (SBR) is never used for making__________________?
A. Coated fabrics
B. Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
C. Gaskets
D. Soles of shoes
The process involved in converting rubber into a thin sheet or coating it on fabric is called__________________?
The process involved in converting rubber into a thin sheet or coating it on fabric is called__________________?
A. Extrusion
B. Mastication
C. Calendaring
D. Vulcanisation