Deck 3: Casting Techniques and Processes

Question 1

Distortion in castings can be reduced by

A)modifying design
B)providing sufficient machining allowance
C)improving foundry practice
D)all of the above

Answer 1

all of the above

Question 2

Which of the following facilitates shaking and lifting large pattern from the mould?

A)Swab
B)Bellows
C)Trowel
D)Ripping plate

Answer 2

Ripping plate

Question 3

In die castings, heavy local sections are usually avoided and replaced by

A)channel sections
B)corrugated forms
C)ribs
D)any of the above

Answer 3

any of the above

Question 4

Which inoculant is used to produced ductile iron?

A)Graphite
B)Carbon
C)Fluorides
D)Magnesium

Question 5

There is no need for the withdrawal of pattern from the mould in case of

A)patterus with core
B)wax patterns
C)hollow patterns
D)consumable patterns

Question 6

Annealing of aluminium castings

A)improves ductility
B)relieves micro stresses
C)reduces tensile strength
D)mechanical properties change

Question 7

The sand mass does not fall out of the moulding box but is held firmly in it when the moulding box is lifted. This is due to the property of

A)adhesiveness of sand
B)plasticity of sand
C)porosity of sand
D)refractoriness of sand

Question 8

Which of the following is used to obtain fine surface finish in ferrous castings?

A)Ground pitch
B)Sea coal
C)Gilsonite
D)any of the above

Question 9

For grey cast iron the pouring temperature is

A)1400 to 1465°C
B)1455 to 1495°C
C)1250 to 1290°C
D)1510 to 1532°C

Question 10

Permeability of sand decreases as

A)permeability increases
B)moisture content increases
C)bonding content increases
D)all of the above

Question 11

On the interior surfaces the draft allowance is usually

A)40 to 60 mm/metre
B)10 to 20 mm/metre
C)100 to 120 mm/metre
D)200 to 225 mm/metre

Question 12

The hardness of the mould is affected by the proportion of ingredients in the sand and

A)degree of ramming
B)the temperature
C)shape of particles
D)refractoriness

Question 13

In furan process, furan resins are primarily used as

A)binders
B)chemicals for exothermic reactions
C)fluxes
D)none of the above

Question 14

The advantage of investment casting is

A)high degree of accuracy
B)adaptability to casting of most of the metals
C)complex shaped articles can be cast
D)all of the above

Question 15

Hot blast of air is supplied to the blast furnace through

A)spout
B)stoves
C)prop
D)tuyers

Question 16

Core prints are

A)made separately in the mould by hand
B)made in the mould be separate pattern
C)attached to pattern
D)none of the above

Question 17

In die casting

A)there is no need of air venting
B)there is no restriction of material, any material that can be poured can be cast
C)the product surface is smooth and clean without the parting line
D)the heat loss from molten metal is fast as the mould is metallic

Question 18

The water content of green sand is usually

A)1 to 2 percent
B)20 to 25 percent
C)6 to 8 percent
D)12 to 18 percent

Question 19

Tin coated low carbon steel chaplets are used in

A)ferrous foundries
B)non-ferrous foundries
C)both (A) and (B) above

Question 20

Scabs may be caused by

A)low permeability of sand
B)high moisture content of sand
C)intermittent running of molten metal over the sand surface
D)any of the above

Question 21

The order of surface finish possible in die castings is

A)0.08 microns
B)0.008 microns
C)0.0008 microns
D)0.8 microns

Question 22

The contraction allowance for magnesium is around

A)5 mm/metre
B)14 mm/metre
C)25 mm/metre
D)1 mm/metre

Question 23

Plaster patterns and core boxes are made of

A)White powder
B)Plaster of Paris
C)Gypsum cement
D)Bone china clay

Question 24

Composition of cast iron can be better controlled when melted in

A)pit furnace
B)cupola
C)arc furnace
D)none of the above

Question 25

By compacting the sand

A)both density as well as permeability decrease
B)density increases and permeability
C)both density as well as permeability increase
D)density decreases and permeability increases