Vulcanisation of raw rubber makes it

Which one of the following statements is not correct? Vulcanisation of rubber makes it

A

Soft and flexible

B

Strong and hard

C

Chemical resistant

D

Withstand higher temperatures

Most commonly used rubber vulcanisation agent is

A

Sulphur

B

Bromine

C

Platinum

D

Alumina

In vulcanisation process, rubber can be hardened by adding

A

Nitrogen

B

Silicon

C

Sulphur

D

Alcohol

__________ of rubber decreases after its vulcanisation.

A

Resistance to the action of organic solvent

B

Tackiness

C

Maximum service temperature

D

Tensile strength

Vulcanisation of rubber

A

Decreases its tensile strength

B

Increases its ozone & oxygen reactivity

C

Increases its oil & solvent resistance

D

Converts its plasticity into elasticity

Vulcanisation of rubber does not increase its

A

Elasticity

B

Plasticity

C

Ductility

D

None of these

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

The price of raw meterials had gone up by 15% labor cost has also increased from 25% of the cost of ras material to 30% of the cost of raw material. By how much percentage should there be reduction in the usage of raw materials so as to keep the cost same?

A

28%

B

17%

C

27%

D

24%

Styrene-butadiene-rubber (SBR) as compared to natural rubber has

A

Poorer tensile strength

B

Poorer resistance to oxidation

C

Greater amount of heat build-up under heavy loading

D

All of the above

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 of the above

Vulcanisation of raw rubber makes it

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