Most commonly used rubber vulcanising agent is

Most commonly used rubber vulcanisation agent is

A

Sulphur

B

Bromine

C

Platinum

D

Alumina

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

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

Rubber is most commonly used insulation in cables.

A

Yes

B

No

The most commonly used bleaching agent is

A

alcohol

B

carbon dioxide

C

chlorine

D

sodium chlorine

Most commonly used bleaching agent is

A

Sodium chloride

B

Alcohol

C

Carbon dioxide

D

Chlorine

Ethernet and Token-Ring are the two most commonly used network architectures in the world. Jim has heard of the different topologies for networks and wants to choose the architecture that will provide him with the most options. Which of the following would that be? Choose the most correct answer.

A

Token-Ring because it currently can run at both 4Mbps and 16Mbps. This means that it can be used in any topology

B

Ethernet, because it is cabled using fiber-optic cable

C

Token-Ring, because it uses a MAU

D

Ethernet, because it can be set up with most topologies and can use multiple transfer speeds

E

Neither Token-Ring nor Ethernet is the proper choice. Only ARCnet can be used in all topologies

__________ is the most suitable for compounding rubber and plastic solids.

A

Banbery mixer

B

Pan mixer

C

Pug mill

D

Charge can mixer

__________ rubber is generally used for making 'O' rings used for vacuum sealings.

A

Natural

B

Neoprene

C

Butadiene

D

Nitrile

Most commonly used rubber vulcanising agent is

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