B11

Question 1

Pipe intended for rubber lining should be fabricated so that:
a) All joints can be welded with a bolt
b) The pipe can be easily cut with a saw
c) All joints can be continuously welded and ground smooth
d) The surface is rough to ensure better adhesion

Answer 1

All joints can be continuously welded and ground smooth

Question 2

What is NOT recommended for use with rubber lining?
a) Seam-welded steel pipe
b) Raised face flanges
c) Cast-steel domes
d) Smooth castings

Answer 2

Raised face flanges

Question 3

The surface of the pipe before lined with rubber should be free from which of the following?
a) Paint
b) Scale and other foreign material
c) Sandblasting marks
d) Welding joints

Answer 3

Scale and other foreign material

Question 4

Unless otherwise specified, the dimensions for pipe are measured:
a) From the centerline to the nozzle
b) End to end
c) From the flange face to the outside surface
d) From the pipe surface to the flange face

Answer 4

End to end

Question 5

All welded pipe joints to be lined with rubber must have:
a) Intermittent welds
b) Continuous solid welds
c) Large welds with visible gaps
d) No welding required

Answer 5

Continuous solid welds

Question 6

Welds to be lined with rubber must be smooth and free from which of the following?
a) Rust and corrosion
b) Porosity, holes, high spots, lumps, pockets, or undercuts
c) Paint and primer
d) Oil and grease

Answer 6

Porosity, holes, high spots, lumps, pockets, or undercuts

Question 7

To remove sharp edges or high spots, what process should be used?
a) Cutting
b) Grinding
c) Sandblasting
d) Polishing

Answer 7

Grinding

Question 8

What must be done to weld splatter before rubber lining?
a) Leave it in place for bonding
b) Grind it smooth or remove entirely
c) Cover it with a sealant
d) Paint over it

Answer 8

Grind it smooth or remove entirely

Question 9

What is the preferred method for welding joints that will be rubber lined?
a) Use of backing rings on the outside
b) Welding without backing rings
c) Welding using backing rings on the inside
d) Welding without any support

Answer 9

Welding using backing rings on the inside

Question 10

What is the required metal preparation for all surfaces to be rubber lined?
a) Cleaning with detergent and water
b) Blasting to a white metal finish
c) Coating with oil and grease
d) Heating the metal to high temperatures

Answer 10

Blasting to a white metal finish

Question 11

What is the purpose of applying primer immediately after sandblasting the metal surfaces?
a) To provide a rough finish for better bonding
b) To prevent rusting
c) To add a smooth finish
d) To paint over the surface

Answer 11

To prevent rusting

Question 12

A multiple construction lining typically contains:
a) A single layer of rubber
b) Multiple layers of different types of rubber
c) Only a tie gum layer
d) A rubber and plastic mixture

Answer 12

Multiple layers of different types of rubber

Question 13

What should be done to the ends of rubber-lined pipes during transportation and storage?
a) Leave them open for ventilation
b) Cover with plywood or suitable material
c) Wrap with plastic sheets
d) Apply an additional rubber layer

Answer 13

Cover with plywood or suitable material

Question 14

What is the recommended durometer hardness for rubber linings according to ASTM D 412?
a) 10-20 Shore A
b) 30-40 Shore A
c) 50-60 Shore A
d) 70-80 Shore A

Answer 14

50-60 Shore A

Question 15

How should bolt tightening be performed on rubber-lined flanges?
a) Random order
b) Cross pattern technique
c) Clockwise order
d) One bolt at a time

Answer 15

Cross pattern technique

Question 16

How should rubber-lined pipes be stored?
a) In a dry, cool environment, avoiding sunlight
b) In any open area
c) In direct sunlight
d) In humid conditions to maintain flexibility

Answer 16

In a dry, cool environment, avoiding sunlight

Question 17

What type of rubber is commonly used for lining industrial pipes?
a) Neoprene
b) Natural rubber
c) Butyl rubber
d) Chlorobutyl rubber

Answer 17

Neoprene

Question 18

When cutting rubber sheets, it is important to use:
a) A sharp knife to ensure clean cuts
b) A serrated edge blade
c) A dull blade to avoid overstretching
d) Scissors for more precision

Answer 18

A sharp knife to ensure clean cuts

Question 19

What is the most significant factor in selecting a rubber lining for abrasion resistance?
a) Chemical composition
b) Hardness of the rubber
c) Elasticity of the rubber
d) Cost of the rubber lining

Answer 19

Hardness of the rubber

Question 20

What is a major limitation of natural rubber as a lining material?
A) Low flexibility at high temperatures
b) Inability to withstand hydrocarbons like benzene and gasoline
c) Poor resistance to water absorption
d) High susceptibility to ozone degradation

Answer 20

Inability to withstand hydrocarbons like benzene and gasoline

Question 21

Which term describes the resistance of a material to oxygen, heat, light, and ozone during storage or use?
a) Adhesion
b) Abrasion Resistance
c) Age Resistance
d) Antioxidant

Answer 21

Age Resistance

Question 22

What is a “Butt Seam” in rubber-lined piping systems?
a) A joint made by overlapping two pieces of rubber
b) A seam created by placing two pieces edge-to-edge for joining
c) A type of adhesive used in bonding rubber materials
d) A defect caused by improper vulcanization of rubber

Answer 22

A seam created by placing two pieces edge-to-edge for joining

Question 23

What does “Durometer Hardness” measure?
a) The elasticity of rubber materials
b) The ability of rubber to resist elevated temperatures
c) The indentation resistance of rubber or plastic materials
d) The tensile strength of rubber materials

Answer 23

The indentation resistance of rubber or plastic materials

Question 24

What is the function of a “Gasket”?
a) To measure the hardness of a material
b) To create a seamless joint between rubber sheets
c) To prevent the escape of matter through an opening or joint
d) To reinforce rubber linings in high-pressure environments

Answer 24

To prevent the escape of matter through an opening or joint

Question 25

What does the term "Elastomer" refer to? a) A material that is hard and brittle at room temperature b) A polymeric material capable of recovering its shape after deformation c) A thin layer of rubber applied to a surface for protection d) A rubber compound with low elongation properties

Answer 25

A polymeric material capable of recovering its shape after deformation

Question 26

What is the primary property of a material with high "Heat Resistance"? a) The ability to resist elongation under stress b) The ability to recover its shape after deformation c) The ability to resist deterioration at elevated temperatures d) The ability to bond with other materials under heat

Answer 26

The ability to resist deterioration at elevated temperatures

Question 27

What is "Lap Seam"? a) A seam made by placing two materials edge-to-edge b) A seam made by overlapping the edge of one piece over another c) A seam created by applying adhesive between two materials d) A seam formed during the curing process

Answer 27

A seam made by overlapping the edge of one piece over another

Question 28

What does "Plasticity" describe in a material? A) The ability of a material to recover its original shape after deformation b) The resistance of a material to chemical degradation c) The tendency of a material to remain deformed after stress is removed d) The ability of a material to resist high temperatures

Answer 28

The tendency of a material to remain deformed after stress is removed

Question 29

What is "Oxidation" in rubber products typically associated with? a) Improved elasticity and strength b) A reaction with oxygen that changes surface properties or physical characteristics c) Increased resistance to chemical attacks d) A bonding process for vulcanization

Answer 29

A reaction with oxygen that changes surface properties or physical characteristics

Question 30

What is "Reversion" in vulcanized rubber? a) The hardening of rubber due to over-curing b) The deterioration and softening of rubber when exposed to excessive heat c) The process of rubber recovery after deformation d) The cleaning of rubber surfaces through sandblasting

Answer 30

The deterioration and softening of rubber when exposed to excessive heat

Question 31

What does "Shelf Life" refer to in rubber products? a) The time a material can be stored without losing its properties b) The deterioration of rubber due to light exposure c) The resistance of rubber to chemical attacks d) The flexibility of rubber after curing

Answer 31

The time a material can be stored without losing its properties

Question 32

What does "Sand Blast" mean in the context of rubber lining? a) A method for cleaning surfaces using a high-pressure stream of sand or grit b) A process for curing rubber under extreme temperatures c) A technique for joining rubber panels in tank linings d) A method for testing the elasticity of rubber

Answer 32

A method for cleaning surfaces using a high-pressure stream of sand or grit

Question 33

What is "Semihard Rubber"? a) A type of rubber that shatters when bent b) A hard rubber that is flexible enough to bend without breaking c) A natural rubber compound resistant to oxygen d) A vulcanized rubber with a soft surface finish

Answer 33

A hard rubber that is flexible enough to bend without breaking

Question 34

What is the significance of "Shore Hardness"? a) It measures the durability of a material in water b) It indicates the hardness value of a material derived from a specific instrument c) It defines the elasticity of rubber after curing d) It measures the thickness of a rubber lining

Answer 34

It indicates the hardness value of a material derived from a specific instrument

Question 35

What is the purpose of "Tie Gum" in rubber compounding? a) To increase the hardness of rubber b) To improve bonding between two surfaces c) To speed up the vulcanization process d) To reduce the tackiness of the rubber

Answer 35

To improve bonding between two surfaces

Question 36

What is "Swelling" in the context of rubber materials? a) The hardening of rubber when exposed to high temperatures b) The increase in volume of rubber when immersed in liquid or exposed to vapor c) The reduction in rubber's elasticity due to chemical exposure d) The decrease in rubber's mass when exposed to a vacuum

Answer 36

The increase in volume of rubber when immersed in liquid or exposed to vapor

Question 37

What is the meaning of "Surface Preparation" in rubber lining applications? a) The application of a final rubber coating to a substrate b) The process of cleaning and treating a surface before applying a rubber lining c) The curing process for rubber to harden d) The final step in joining rubber panels to a substrate

Answer 37

The process of cleaning and treating a surface before applying a rubber lining

Question 38

What is "Tensile Strength" in relation to rubber materials? a) The maximum weight a material can withstand without breaking b) The resistance of rubber to chemical attacks c) The ability of rubber to return to its original shape after stretching d) The resistance of rubber to wear and tear

Answer 38

The maximum weight a material can withstand without breaking

Question 39

What does "Thermal Stability" refer to in rubber? a) The ability of rubber to resist elongation under heat b) The ability of rubber to maintain its properties at high temperatures c) The degree to which rubber can conduct heat d) The process of bonding rubber at elevated temperatures

Answer 39

The ability of rubber to maintain its properties at high temperatures

Question 40

What does "Urethane" refer to in the context of rubber? a) A synthetic polymer used for waterproof linings b) A type of natural rubber c) A polymer used for its resistance to abrasion and weathering d) A rubber used primarily for electrical insulation

Answer 40

A polymer used for its resistance to abrasion and weathering

Question 41

What does "Vulcanization" primarily involve? a) Adding oils to improve the elasticity of rubber b) Applying heat and pressure to rubber to improve its strength and elasticity c) The process of curing rubber using cold temperatures d) Bonding rubber to metal for increased durability

Answer 41

Applying heat and pressure to rubber to improve its strength and elasticity

Question 42

What is "Wear Resistance" in rubber materials? a) The ability of rubber to withstand changes in temperature b) The resistance of rubber to physical degradation from friction and use c) The ability to resist chemical corrosion d) The ability to maintain flexibility at low temperatures

Answer 42

The resistance of rubber to physical degradation from friction and use

Question 43

What is "Curing" in the context of rubber processing? a) The process of making rubber resistant to environmental changes b) The process of hardening rubber by applying heat and pressure c) The process of blending rubber with additives d) The process of cleaning rubber after manufacturing

Answer 43

The process of hardening rubber by applying heat and pressure

Question 44

What is "Elongation at Break"? a) The maximum amount of stress a rubber material can withstand before breaking b) The length a rubber material can stretch before it fails c) The ability of rubber to return to its original form after stretching d) The temperature at which rubber will begin to soften

Answer 44

The length a rubber material can stretch before it fails