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
Related Mcqs:
- 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 - SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at_________________?
A. 1: 3
B. 3 : 1
C. 1 : 2
D. 2 : 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. - ____________ 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 - 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 - Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styreneacrylonitrile copolymer with butadiene based elastomer, is a/an__________________?
A. Rigid foam
B. Engineering plastic
C. Thermosetting polymer
D. Spongy rubber - Styrene butadiene rubber is commercially manufactured by__________________?
A. Bulk polymerisation
B. Suspension polymerisation
C. Solution polymerisation
D. Emulsion polymerisation - 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 - Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about ______________ ° C?
A. -20
B. 50
C. 250
D. 500 - 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
