Deck 10: Casting Processes and Materials

Question 1

Malleable castings are used for

A)boilers
B)Automobiles
C)Elevators
D)all of the above

Answer 1

all of the above

Question 2

All of the following are boring tools EXCEPT

A)Gauge
B)Pinchdog
C)Brace
D)Auger bit

Answer 2

Brace

Question 3

Tempering is generally done to reduce all of the following EXCEPT

A)Hardness
B)Brittleness
C)Tensile strength
D)Ductility

Answer 3

Ductility

Question 4

The solidification shrinkage of carbon steel is around

A)0.5 to 1 percent
B)2 to 4 percent
C)8 to 10 percent
D)0.1 to 0.2 percent

Question 5

The draft allowance to be provided on a pattern depends on

A)the length of the vertical side of the pattern to be extracted
B)the intricacy of the pattern
C)the method of moulding
D)all of the above

Question 6

Magnesium aluminium alloys are grain refined by addition of

A)manganese
B)sulphur
C)carbon
D)tin

Question 7

The advantage of oxygen enriched cupola is

A)higher temperature of molten iron
B)high efficiency of cupola
C)reduced heat loss in waste gases
D)all of the above

Question 8

The contraction allowance for pattern depends on

A)composition of the metal
B)method of moulding used
C)pouring temperature
D)all of the above

Question 9

The advantage of shell moulding is

A)Less sand requirement
B)Process can be used for all cast metals
C)Good accuracy of dimensions
D)All of the above

Question 10

Providing more than adequate machining allowance

A)reduces machining cost
B)increases machining cost
C)improves the strength of the casting
D)reduces the strength of the casting

Question 11

As a result of melting in cupola, the percentage of all of the following constituents decreases EXCEPT

A)Sulphur
B)Silicon
C)Phosphorous
D)Carbon

Question 12

Chaplets are provided to

A)reduce core sag
B)support heavy cores
C)compensate for inadequate coreseats
D)all of the above

Question 13

Polystyrene often used as a consumable pattern material has a relative density of

A)20 to 25 kg/m³
B)2240 to 2500 kg/m³
C)120 to 125 kg/m³
D)1120 to 1125 kg/m³

Question 14

For stress relieving, castings are

A)heated to low temperature and furnace cooled
B)heated to a temperature around melting point and slowly cooled
C)heated in stages and also cooled in stages
D)heated by flame and air cooled

Question 15

Gated patterns are normally used for

A)castings for light metals
B)castings having several hollow spaces
C)mass production of small castings
D)production of castings which do not require machining

Question 16

Casting made in relatively simple shapes and designed for subsequent fabrication by rolling, forging etc. are known as

A)rolls
B)pigs
C)ingots
D)chills

Question 17

Which of the following is used as protective admixture in moulding sand for magnesium castings?

A)Boric acid
B)Sublimed sulphur
C)Fluoric additives
D)Any of the above

Question 18

For sterite refractory bricks are attacked by

A)basic slags
B)acid slags
C)alkali compounds
D)all of the above

Question 19

Which of the following is the anti-penetration material introduced in the moulding sand?

A)Coad dust
B)Powdered quartz
C)Black oil
D)all of the above

Question 20

The property of sand to withstand the high temperature of the molten metal without fusing or breakdown is known as

A)porosity
B)refractoriness
C)cohesiveness
D)adhesiveness

Question 21

Addition of nickel to cast iron increases

A)hardness
B)corrosion resistance
C)tensile strength
D)all of the above

Question 22

A casting process which can produce hollow cylinder without use of core is

A)permanent mould casting
B)semi permanent mould casting
C)pressed casting
D)none of the above

Question 23

The advantage of centrifugal casting is

A)dense castings
B)elimination of cores
C)mass production with reduced rejection possible
D)all of the above

Question 24

All of the following are non-destructive method of testing the castings EXCEPT

A)Dye penetrant inspection
B)Pressure test
C)Ultrasonic test
D)Tensile test

Question 25

Which of the following is not necessarily the characteristic of investment casting?

A)No disfiguring parting line as found on castings made by cope and drag methods
B)Extreme dimensional accuracy
C)Excellent surface finish
D)Low cost