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 ?

Related Mcqs:

1. 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.

2. ____________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR?

   A. Percent elongation
   B. Resilience
   C. Freezing point
   D. Strength

3. 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.

4. 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

5. Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butadiene rubber) are____________________?

   A. 50°C and 3 – 4 kg/cm2
   B. 50°C and 1 kgf/cm2
   C. 250°C and 10 kgf/cm2
   D. 250°C and 1 kgf/cm2

6. Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are__________________?

   A. 5°C and 1 kgf/cm2
   B. – 20°C and 1 kgf/cm2
   C. 0°C and 1 kgf/cm2
   D. 0°C and 3 kgf/cm2

7. 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

8. 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

9. Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser ?

   A. Ethylene glycol
   B. Stearic acid estors
   C. Tricresyl phosphate
   D. Esters of phthalic acid

10. Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of _______________ percent?

    A. 1-1000
    B. 1000-1500
    C. 1500-2000
    D. 2000-2500