Deck 2: Foundry and Casting

Question 1

High pouring rate leads to

A)mould erosion
B)rough surface
C)excessive shrinkage
D)any of the above

Answer 1

any of the above

Question 2

The most suitable metals for die casting are

A)zinc and its alloys
B)copper and its alloys
C)aluminium and its alloys
D)none of the above

Answer 2

zinc and its alloys

Question 3

All of the following are clamping tools EXCEPT

A)Pich dog
B)C-clamp
C)Hard screw
D)Brace

Answer 3

Brace

Question 4

Pattern draft for external surfaces is (in mm/m)

A)15 -- 50
B)10 -- 25
C)40 - 60

Question 5

Sand is broadly specified by

A)grain size
B)colour
C)moisture content
D)all of the above together

Question 6

Chaplets are made of

A)wood
B)metal
C)organic matter
D)core sand

Question 7

Clay content of green sand is usually

A)5 to 10 percent
B)1 to 3 percent
C)30 to 50 percent
D)18 to 30 percent

Question 8

The sprue pin/sprue hole used for sand moulds is

A)Tapered downwards
B)Has no taper at all
C)Tapered upwards

Question 9

Pig iron is obtained from iron ore, in a blast furnace by the process of

A)oxidation
B)desulphurisation
C)reduction
D)carbonation

Question 10

Which of the following statement about gates is incorrect?

A)he size of gate depends upon the rate of solidification
B)More than one gate may be used to feed a fast freezing casting
C)A gate should not have sharp edges
D)A small gate is used for castings which solidify rapidly

Question 11

In case of arc furnaces electric supply for electrodes consists of

A)low voltage and high current
B)low voltage and low current
C)high voltage and high current
D)high voltage and low current

Question 12

The sand used for filling the bulk of the moulding flask

A)Facing sand
B)Dry-sand
C)Floor sand

Question 13

In fluminium foundry, for removing dissolved hydrogen and the entrapped dross, the flux used is

A)nitrogen
B)helium
C)chlorine
D)any of the above

Question 14

Choose the correct statement in respect of die casting machine

A)In hot chamber die casting machine the metal is melted in the machine itself
B)In cold chamber die casting machine metal of low melting point is cast
C)In cold chamber die casting machine there is no need to cool the die from outside
D)none of the above

Question 15

The thicker sections of casting will have a tendency to have

A)grains coarser than thinner sections
B)grains finer than thinner sections
C)grains of sme size as rest of the casting
D)none of the above

Question 16

The moulding tool used for finishing/repairing the sand mould after pattern withdrawal is termed as

A)Slincks
B)Lifters or cleaners
C)Trowels

Question 17

Which of the following test on castings is based on sound?

A)Magnetic particle inspections
B)Percussion test
C)Impact test
D)Radiographic

Question 18

Presence of sulphur in cast iron

A)retards fluidity
B)promotes brittleness
C)promotes oxidation
D)all of the above

Question 19

Hand tool used in foundry shop for mixing and conditioning the foundry sand is termed

A)Shovel
B)Trowel
C)Riddle

Question 20

Shell moulding is uneconomical for

A)small castings
B)large scale production
C)small scale production
D)all of the above

Question 21

Shatter test is a measure of

A)sand toughness
B)sand adhesiveness
C)sand cohesiveness
D)none of the above

Question 22

Cohesiveness of sand depends on

A)grain size and shape of sand particles
B)bonding material
C)moisture content
D)all of the above

Question 23

Which grain shape of sand particles is least preferred for foundry sands?

A)Round
B)Compound
C)angular

Question 24

In melting of aluminium, the dross consists of

A)oxides of aluminium, magnesium etc.
B)sand and dust
C)lighter material
D)none of the above

Question 25

The disadvantage in using wood as the material for pattern making is

A)it is lighter than the metal to be cast
B)its different strength along the grains and across the grains
C)its low cost
D)it gets warped when not stored properly