Deck 9: Glassworking

Question 1

Which one of the following terms refers to the glassy state of a material:

A)crystalline
B)devitrified
C)polycrystalline
D)vitiated
E)vitreous

Answer 1

vitreous

Question 2

Besides helping to preserve the environment, the use of recycled glass as an ingredient of the starting material in glassmaking serves what other useful purpose (one answer):

A)adds coloring variations to the glass for aesthetic value
B)makes the glass easier to melt
C)makes the glass stronger
D)reduces odors in the plant

Answer 2

makes the glass easier to melt

Question 3

Classifying the sand to be melted into molten glass before shaping is best defined by which one of the following:

A)grouping the grains according to size
B)mixing the batch to achieve uniform distribution of grain sizes
C)preheating the batch
D)sorting the grains according to color
E)washing the sand particles

Answer 3

grouping the grains according to size

Question 4

The charge in glassworking is which one of the following:

A)the duration of the melting cycle
B)the electric energy required to melt the glass
C)the name given to the melting furnace
D)the starting materials in melting

Question 5

Typical glass melting temperatures are in which of the following ranges:

A)400 $\degree$ C to 500 $\degree$ C
B)900 $\degree$ C to 1000 $\degree$ C
C)1500 $\degree$ C to 1600 $\degree$ C
D)2000 $\degree$ C to 2200 $\degree$ C

Question 6

Which one of the following processes or processing steps is not applicable in glassworking:

A)annealing
B)pressing
C)quenching
D)sintering

Question 7

Glass spinning is a glassworking process used to produce which of the following types of products:

A)filaments for fiber optics
B)flat plates
C)funnel-shaped components
D)lenses
E)tubes

Question 8

The press -and- blow process is best suited to the production of narrow-necked beverage bottles, while the blow-and-blow process is more appropriate for producing wide-mouthed jars:

Question 9

Casting is a glassworking process used for

A)high production
B)low production
C)medium production

Question 10

The process used to produce flat plat glass in which molten glass flows onto the surface of molten tin is called which one of the following:

A)casting
B)Danner process
C)float process
D)molten tin process
E)rolling

Question 11

Which one of the following processes is used to produce glass tubing:

A)Danner process
B)centrifugal casting
C)pressing
D)spinning

Question 12

Centrifugal spraying is used to produce which one of the following:

A)continuous filaments of glass
B)glass powders
C)glass wool
D)thin coatings of glass on the surface of metal

Question 13

If a glass part with a wall thickness of 5 mm (0.20 in) takes 10 minutes to anneal, how much time would a glass part of similar geometry but with a wall thickness of 7.5 mm (0.30 in) take to anneal (choose the one closest answer):

A)10 minutes
B)15 minutes
C)20 minutes
D)30 minutes

Question 14

A lehr is which of the following:

A)a lion's den
B)a melting furnace
C)a sintering furnace
D)an annealing furnace
E)none of the above

Question 15

Tempered glass is used for all but which one of the following products:

A)all-glass doors
B)automobile windshields
C)safety glasses
D)windows for tall buildings