Objective Questions (MCQ) on Polymer Technology
1- Two rubbers which are prepared by coordination polymerization are
A:- BR and SBR
B:- BR and CR
C:- BR and IIR
D:- IR and EPDM
2- The following is not a delayed action accelerator
A:- MBTS
B:- CBS
C:- NOBS
D:- DPG
3- A very convenient cure system for polyacrylate rubber is
A:- Peroxide
B:- Isocyanate
C:- Sulphur + MBTS
D:- Sulphur + soap
4- Banbury mixing is suitable for industries doing
A:- Large volumes of a limited number of compounds based on similar rubbers
B:- Small volumes of a large number of compounds
C:- Any type of rubber industry
D:- Large volumes of a large number of compounds involving all types of rubbers
6- Natural rubber is
A:- Highly suitable for injection molding
B:- Difficult to injection mold due to compounds with high viscosity and high scorch danger
C:- Difficult to injection mold due to scorch danger
D:- Difficult to injection mold due to high viscosity compounds
7- Reclaimed rubber is useful because
A:- It helps to reduce cost
B:- It reduces cost and gives processing advantages
C:- It reduces cost, gives processing advantages, and also improves aging resistance for NR compounds besides solving the pollution problem caused by littering of used tires
D:- It reduces cost, and gives processing advantages besides reducing the pollution problem caused by littering of used tires
8- ____________ polymer is suitable for blow molding
A:- NR
B:- EPDM
C:- Silicone
D:- SBS
9- The life of an oil seal depends on _______ property
A:- Compressive modulus
B:- Creep modulus
C:- Compression set
D:- Hardness
10- For getting the faster cure rate in IIR
A:- we can increase isoprene content
B:- we can halogenate it
C:- both of the above
D:- neither 1 or 2
ANSWERS:
1-(D), 2-(D), 3-(D), 4-(A), 5-(), 6-(B), 7-(C), 8-(D), 9-(C), 10-(C)