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260+ Foundry Technology Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .

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

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