A. Vulcanise it
B. Protect it from deterioration on exposure to air
C. Make it non-inflammable
D. Make it thermosetting
Related Mcqs:
- Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxidant used in rubber ?
A. Carbon
B. Alkylated diphenyl amine
C. Thiokol
D. Magnesium - Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ?
A. Ammonium alum
B. Potassium alum
C. Both A. & B.
D. Neither A. nor B. - Styrene butadiene rubber (SBR) as compared to natural rubber has_______________?
A. Poor tensile strength
B. Poorer resistance
C. Greater amount of heat build up heavy loading
D. All A., B. and C. - Which of the following is the most important rubber compounding ingredient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ?
A. Phosphorous
B. Carbon black
C. Pine oil
D. Rosin - Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its_________________?
A. Elasticity
B. Strength
C. Plasticity
D. Weathering characteristics - Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to _________________?
A. Protect rubber goods from attack by oxygen & ozone present in the atmosphere
B. Reduce its viscosity to permit easier processing
C. Reduce the time of vulcanisation and quantity of vulcanising agent
D. Increase its viscosity - Tubeless tyres are made of ______________ rubber, which is a co-polymer of isoprene & isobutylene?
A. Nitrile
B. Silicone
C. Neoprene
D. Butyl - Vulcanisation of rubber does not increase its_________________?
A. Elasticity
B. Plasticity
C. Ductility
D. None of these - Nitrile rubber is produced by the polymerisation of_________________?
A. Acrylonitrile & butadiene
B. Acrylonitrile & styrene
C. Isobutylene & isoprene
D. None of these - Vulcanisation of raw rubber makes it__________________?
A. Soft
B. Less elastic
C. Plastic
D. Tacky
