Deck 6: Foundry Operations and Techniques

Question 1

The disadvantage of hot blast cupola is

A)low coke consumption
B)reduced silicon loss
C)reduced output silicon loss
D)all of the above

Answer 1

all of the above

Question 2

Addition of saw dust to moulding sand increases its

A)gas permeability
B)refractoriness
C)cohesiveness
D)all of the above

Answer 2

gas permeability

Question 3

Swab is used for

A)applying water to the mould around the edge of the pattern
B)shaking pattern to facilitate its with drawl from the mould
C)repairing and finishing of mould
D)none of the above

Answer 3

applying water to the mould around the edge of the pattern

Question 4

For annealing of aluminium it is heated to

A)625°C
B)325°C
C)525°C
D)425°C

Question 5

In case of consumable patterns

A)labour charges are reduced
B)core is not required
C)moulds are unsplit
D)all of the above

Question 6

The burnt on sand causes difficulty in

A)machining of castings
B)removal of castings from moulds
C)separation of sand and castings after pouring
D)all of the above

Question 7

The melting unit is an integral part of

A)the cold chamber diecastings machine
B)the hot chamber die casting machine
C)both (A) and (B) above

Question 8

Refractories should have all the following properties EXCEPT

A)Long life
B)Heat insulation
C)High electrical conductivity
D)Minimum contraction and expansion due to temperature variations

Question 9

Heating of core is necessary while using which of the following core binder?

A)Phenol formaldehyde resin
B)Phenolic alcohols
C)Furan-base binder
D)All of the above

Question 10

Which of the following metals has the lowest melting point?

A)Magnesium
B)Aluminium
C)Silver
D)Brass

Question 11

Which of the following statement about core is incorrect?

A)core should be capable of collapsing after the molten metal has solidified around it
B)core should produce maximum amount of gas when in contact with molten metal
C)core should be capable of collapsing shortly after the molten metal has solidified around it
D)core should be permeable to escape of core gases

Question 12

Rammer used for moulding the sand in large mould known as

A)Hand rammer
B)Peen rammer
C)Floor rammer

Question 13

All of the following operations on castings are carried out for surface appearance improvement EXCEPT

A)Galvanising
B)Chilling
C)Electroplating
D)Enamelling

Question 14

Wax patterns are used in

A)non-ferrous castings
B)investment casting process
C)machine moulding process
D)all of the above

Question 15

In copper alloy foundry which of the following is used to prevent the molten metal from being oxidized?

A)phophorous
B)bone ash
C)calcium carbonate
D)charcoal

Question 16

While selecting wood for patterns, one should

A)discard the rot
B)discard the seasoned wood
C)select the fresthy filled wood
D)select the cross-grained woods

Question 17

A spoke shave is a

A)planing tool
B)sawing tool
C)boring tool
D)layout tool

Question 18

Oil used for core sand is

A)molasses
B)linseed oil
C)mineral oil
D)any of the above

Question 19

The percentage of sulphur in pig iron is generally

A)0.8% to 0.9%
B)0.01% to 0.3%
C)0.3% to 0.55%
D)0.6% to 0.79%

Question 20

Solidification time for riser should be

A)less than that of the casting
B)same as that for the casting
C)more than that of the casting

Question 21

Which of the following is very powerful carbide former in cast iron?

A)Chromium
B)Nickel
C)Vanadium
D)Silicon

Question 22

Sweep patterns are used to prepare mould of

A)symmetrical and regular shapes
B)unsymmetrical and regular shapes
C)unsymmetrical and irregular shapes
D)none of the above

Question 23

For aluminium alloys grain refinement can be achieved using

A)titanium
B)boron
C)zirconium
D)any of the above

Question 24

Pneumatic tools find application in foundries normally for

A)fin removal
B)surface finish
C)filling of cavities
D)none of the above

Question 25

Which parameter can be used for the measurement of melt in a foundry?

A)Thermo couple pyrometer
B)Optical pyrometer
C)Radiation pyrometer
D)none of the above