260+ Foundry Technology Solved MCQs

1.

Permeability of moulding sand is increased due to/by

A. Hard ramming
B. Soft ramming
D. Clay
Answer» B. Soft ramming
2.

In small castings which of the following allowance can be ignored?

A. Machining allowance
B. Rapping allowance
C. Draft allowance
E. Shrinkage allowance
Answer» B. Rapping allowance
3.

The design of gate should be such as to

A. avoid erosion of cores and mould cavity
B. prevent scum, slag and eroded sand particles from entering the mould cavity
C. minimize turbulence and dross formation
D. all of the above
Answer» D. all of the above
4.

Mixing coal dust with moulding sand results in

A. blackening of the mould
B. strong mould
C. good air venting
D. none of the above
Answer» A. blackening of the mould
5.

The order of dimensional accuracy in die casting is nearly

B. 4 percent
C. 0.4 percent
D. 0.04 percent
E. 0.004 percent
Answer» C. 0.4 percent
6.

Hairlines in die casted materials result from

A. chemical attack
B. mechanical erosion
C. thermal fatigue
D. all of the above
Answer» C. thermal fatigue
7.

Flux used in cupola while melting cast iron is

A. lime stone
B. coke slurry
C. molasses
D. any of the above
Answer» A. lime stone
8.

Which heat treatment is applicable to aluminium alloy castings?

A. Stabilizing
B. Solution heat treatment
C. Artificial ageing
D. all of the above
Answer» D. all of the above
9.

Die casting is generally not used for

A. cast iron
B. zinc base alloys
C. aluminium base alloys
E. non-ferrous metals
Answer» A. cast iron
10.

The principal ingredients of moulding sands are

B. silica sand, carbon, hydrocarbons and moisture
C. silica sand, clay and water
D. silica sand, dust and crabon
E. silica sand, carbon and water
Answer» C. silica sand, clay and water
11.

The function of ejection pin in die casting is to

A. pushout casting off the die
B. provide movable core spaces
C. facilitate die casting of several components
D. none of the above
Answer» A. pushout casting off the die
12.

Which of the following process is used for melting of steel?

A. L D process
B. Kaldo process
C. Duplex process
D. All of the above
Answer» D. All of the above
13.

Slag and dross can be removed by

A. skimming from the molten metal
B. using bottom pouring ladle
C. using pouring basin in place of a pouring cup
D. any of the above
Answer» D. any of the above
14.

Sand acquires a predetermined shape under pressure and retains the same when pressure is removed. This is due to the property of sand known as

A. Cohesiveness
B. Plasticity
C. Refractoriness
D. none of the above
Answer» B. Plasticity
15.

Refractoriness in the moulding sand is due to the presence of

A. Clay
B. Additives and Binders
C. Silica
Answer» C. Silica
16.

Heat treatment of castings is usually done for

A. refinement of grain structure
B. improving machinability
C. relieving internal stress
D. any of the above
Answer» D. any of the above
17.

Average amount of sand required in a foundry for making one tonne of casting is nearly

B. 2 tonnes
C. 20 tonnes
D. 0.1 tonne
E. 0.2 tonne
Answer» B. 2 tonnes
18.

On drying, wood

A. expands
C. shrinks
D. changes colour
Answer» C. shrinks
19.

Aluminium is not a very good material for die casting because

A. it is very light but strong
B. its melting point is high, it erodes the die surface and tends to react chemically with die
C. it cools much slowly
D. none of the above
Answer» B. its melting point is high, it erodes the die surface and tends to react chemically with die
20.

Warped castings may be produced due to

A. poor collapsibility of cores
B. non-provision of camber allowance on the pattern
C. weak flasks
D. any of the above
Answer» D. any of the above
21.

The most efficient shape of a series is that which

A. given a minimum heat loss
B. keeps the metal in molten state for longer period
C. both (A) and (B) above
Answer» C. both (A) and (B) above
22.

The purpose of clay in a moulding sand is to

A. Act as a binder in the mould
B. Make the mould refractory
E. Mak the mould permeable
Answer» A. Act as a binder in the mould
23.

A defect in castings in which a discontinuity is formed due to the imperfect fusion of two streams of metal in the mould cavity is known as

A. scabs
B. hot tears
C. cold shut
E. drops
Answer» C. cold shut
24.

Of the following metals, the pouring rate should be minimum for

A. brass
B. cast iron
C. aluminium
D. steel
Answer» C. aluminium
25.

Which of the following metal can be cast in plaster moulds?

A. Yellow brass
B. Manganese
C. Aluminium bronzes
D. All of the above
Answer» D. All of the above
26.

High pouring rate leads to

A. mould erosion
B. rough surface
C. excessive shrinkage
D. any of the above
Answer» D. any of the above
27.

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» A. zinc and its alloys
28.

All of the following are clamping tools EXCEPT

A. Pich dog
B. C-clamp
C. Hard screw
D. Brace
Answer» D. Brace
29.

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

B. 15 -- 50
C. 10 -- 25
E. 40 - 60
Answer» C. 10 -- 25
30.

Sand is broadly specified by

A. grain size
B. colour
C. moisture content
D. all of the above together
Answer» A. grain size
31.

Chaplets are made of

A. wood
B. metal
C. organic matter
E. core sand
Answer» B. metal
32.

Clay content of green sand is usually

A. 5 to 10 percent
B. 1 to 3 percent
C. 30 to 50 percent
E. 18 to 30 percent
Answer» E. 18 to 30 percent
33.

The sprue pin/sprue hole used for sand moulds is

B. Tapered downwards
C. Has no taper at all
D. Tapered upwards
Answer» B. Tapered downwards
34.

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

A. oxidation
B. desulphurisation
D. reduction
E. carbonation
Answer» D. reduction
35.

Which of the following statement about gates is incorrect?

B. he size of gate depends upon the rate of solidification
C. More than one gate may be used to feed a fast freezing casting
D. A gate should not have sharp edges
E. A small gate is used for castings which solidify rapidly
Answer» E. A small gate is used for castings which solidify rapidly
36.

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
Answer» A. low voltage and high current
37.

The sand used for filling the bulk of the moulding flask

B. Facing sand
C. Dry-sand
D. Floor sand
Answer» D. Floor sand
38.

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
Answer» D. any of the above
39.

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
Answer» A. In hot chamber die casting machine the metal is melted in the machine itself
40.

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
Answer» A. grains coarser than thinner sections
41.

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

B. Slincks
D. Lifters or cleaners
E. Trowels
Answer» D. Lifters or cleaners
42.

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

B. Magnetic particle inspections
C. Percussion test
D. Impact test
E. Radiographic
Answer» C. Percussion test
43.

Presence of sulphur in cast iron

A. retards fluidity
B. promotes brittleness
C. promotes oxidation
D. all of the above
Answer» D. all of the above
44.

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

A. Shovel
B. Trowel
C. Riddle
Answer» A. Shovel
45.

Shell moulding is uneconomical for

A. small castings
B. large scale production
C. small scale production
D. all of the above
Answer» C. small scale production
46.

Shatter test is a measure of

A. sand toughness
B. sand adhesiveness
C. sand cohesiveness
D. none of the above
Answer» A. sand toughness
47.

Cohesiveness of sand depends on

A. grain size and shape of sand particles
B. bonding material
C. moisture content
D. all of the above
Answer» D. all of the above
48.

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

B. Round
D. Compound
E. angular
Answer» B. Round
49.

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
Answer» A. oxides of aluminium, magnesium etc.
50.

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
D. its low cost
E. it gets warped when not stored properly
Answer» E. it gets warped when not stored properly
51.

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» D. all of the above
52.

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

A. Swab
B. Bellows
D. Trowel
E. Ripping plate
Answer» E. Ripping plate
53.

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» D. any of the above
54.

Which inoculant is used to produced ductile iron?

A. Graphite
B. Carbon
D. Fluorides
E. Magnesium
Answer» E. Magnesium
55.

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

A. patterus with core
C. wax patterns
D. hollow patterns
E. consumable patterns
Answer» E. consumable patterns
56.

Annealing of aluminium castings

A. improves ductility
B. relieves micro stresses
C. reduces tensile strength
E. mechanical properties change
Answer» B. relieves micro stresses
57.

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
D. porosity of sand
E. refractoriness of sand
Answer» A. adhesiveness of sand
58.

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
Answer» D. any of the above
59.

For grey cast iron the pouring temperature is

A. 1400 to 1465?C
B. 1455 to 1495?C
D. 1250 to 1290?C
E. 1510 to 1532?C
Answer» E. 1510 to 1532?C
60.

Permeability of sand decreases as

A. permeability increases
B. moisture content increases
C. bonding content increases
D. all of the above
Answer» D. all of the above
61.

On the interior surfaces the draft allowance is usually

A. 40 to 60 mm/metre
B. 10 to 20 mm/metre
D. 100 to 120 mm/metre
E. 200 to 225 mm/metre
Answer» A. 40 to 60 mm/metre
62.

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
E. refractoriness
Answer» A. degree of ramming
63.

In furan process, furan resins are primarily used as

A. binders
B. chemicals for exothermic reactions
C. fluxes
D. none of the above
Answer» A. binders
64.

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
Answer» D. all of the above
65.

Hot blast of air is supplied to the blast furnace through

A. spout
B. stoves
C. prop
D. tuyers
Answer» D. tuyers
66.

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
Answer» C. attached to pattern
67.

In die casting

B. there is no need of air venting
C. there is no restriction of material, any material that can be poured can be cast
D. the product surface is smooth and clean without the parting line
E. the heat loss from molten metal is fast as the mould is metallic
Answer» E. the heat loss from molten metal is fast as the mould is metallic
68.

The water content of green sand is usually

B. 1 to 2 percent
C. 20 to 25 percent
D. 6 to 8 percent
E. 12 to 18 percent
Answer» D. 6 to 8 percent
69.

Tin coated low carbon steel chaplets are used in

A. ferrous foundries
B. non-ferrous foundries
C. both (A) and (B) above
Answer» A. ferrous foundries
70.

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
Answer» D. any of the above
71.

The order of surface finish possible in die castings is

A. 0.08 microns
C. 0.008 microns
D. 0.0008 microns
E. 0.8 microns
Answer» E. 0.8 microns
72.

The contraction allowance for magnesium is around

A. 5 mm/metre
B. 14 mm/metre
D. 25 mm/metre
E. 1 mm/metre
Answer» B. 14 mm/metre
73.

Plaster patterns and core boxes are made of

A. White powder
B. Plaster of Paris
C. Gypsum cement
D. Bone china clay
Answer» C. Gypsum cement
74.

Composition of cast iron can be better controlled when melted in

A. pit furnace
B. cupola
C. arc furnace
D. none of the above
Answer» C. arc furnace
75.

By compacting the sand

A. both density as well as permeability decrease
C. density increases and permeability
D. both density as well as permeability increase
E. density decreases and permeability increases
Answer» C. density increases and permeability
76.

In low temperature die casting the metals whose alloys are cast are

A. aluminium and zinc
B. zinc and copper
C. copper, zinc and lead
D. none of the above
Answer» D. none of the above
77.

Moulding sand properties that depend upon size and shape of grains and bonding material are

A. plasticity and adhesiveness
B. cohesiveness and permeability
C. permeability and plasticity
D. adhesiveness and cohesiveness
Answer» B. cohesiveness and permeability
78.

Pattern used in foundry shop is

A. Somewhat smaller in size than the casting
D. Somewhat larger in size than the casting
E. Equal in size to the casting
Answer» D. Somewhat larger in size than the casting
79.

The advantage of investment casting is

A. Sound costings are produced
B. Inricate shapes can be cast
C. Close tolerances can be achieved
D. All of the above
Answer» D. All of the above
80.

The tool used to make small holes in the sand mould to allow passage of gases/steam is known as

A. Vent wire
B. Draw screw
C. Draw spike
Answer» A. Vent wire
81.

Graphite is sprinkled on to the surface of green sand moulds to

A. reduce the number of blow holes
B. minimize surface finish
D. exclude the burn out effect
E. improve surface finish
Answer» D. exclude the burn out effect
82.

If dross and slag along with the liquid metal reach the mould cavity they produce the defect known as

A. misrun
B. inclusions
C. blow holes
D. all of the above
Answer» B. inclusions
83.

The permeability of moulding sand depends on

A. grain size
B. grain shape
C. moisture content
D. all of the above
Answer» D. all of the above
84.

Highest melting point metal is

B. cast iron
C. Tungsten
D. Steel
E. Nickel
Answer» C. Tungsten
85.

Chaplets are

B. core binders
C. core supports
D. mould seats to support core
E. core projections
Answer» C. core supports
86.

Which of the following is measuring and layout tool?

A. Trammels
B. Combination square
C. Marking gauge
D. all of the above
Answer» D. all of the above
87.

The method in which green sand is generally used is

A. pit moulding
B. plate moulding
C. bench moulding
D. none of the above
Answer» A. pit moulding
88.

The amount of machining allowance on castings depends on

A. size and shape of the casting
B. casting orientation
C. characteristics of the metal
D. all of the above
Answer» D. all of the above
89.

Which of the following process uses organic binder?

A. Shell moulding
B. Furan process
C. Phenolic isocyanate process
D. All of the above
Answer» D. All of the above
90.

Gold melts at

A. 1063?C
B. 3300?C
C. 1444?C
E. 2100?C
Answer» A. 1063?C
91.

Which wood is difficult to machine?

A. Kiln dried wood
C. Old and used wood
D. Freshly failed wood
E. Seasoned wood
Answer» D. Freshly failed wood
92.

Coke used in cupola is in the form of

A. coal dust
B. pulverized coal
C. lumps
D. any of the above
Answer» C. lumps
93.

The amount of coal dust added to moulding sand depends on

A. shape of the casting
B. thickness of the casting
C. temperature of pouring
D. none of the above
Answer» B. thickness of the casting
94.

Which of the following statement is correct?

A. Less sand is used per tonne of non-ferrous castings than for steel
D. More sand is used per tonne of non-ferrous castings than for steel
Answer» A. Less sand is used per tonne of non-ferrous castings than for steel
95.

Skeleton patterns are generally used for

A. hollow castings
B. small casting
C. large castings
E. non-ferrous castings
Answer» C. large castings
96.

Sodium silicate in sand in often used as

A. binder
B. permeability promotion agent
C. substitute of clay
D. refractory material
Answer» A. binder
97.

Which of the following defect may occur due to improper design of gating system?

A. Cold shuts
B. Rough surfaces
C. Misruns
D. any of the above
Answer» D. any of the above
98.

Pit furnace can be used for the melting of

A. cast iron
B. aluminium
C. brass
D. any of the above
Answer» D. any of the above
99.

Shell moulding is a process in which

A. a mould comprising thin shell is produced by mixing dry silica and resin binder
C. a thin shell is cast in sand mould
E. a strong core is prepared
Answer» A. a mould comprising thin shell is produced by mixing dry silica and resin binder
100.

Die casting dies are generally made of

A. aluminium alloys
B. bronze
D. cast iron
E. alloy steels
Answer» E. alloy steels
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