NEW
Font size
WorksheetsMetal Casting and Welding
Total questions: 30
Worksheet time: 30mins
Mechanical working processes are performed on metals
to achieve optimum mechanical properties in the metal
to improve the mechanical strength of the metal
to make metal dense
All of the above
Hot working process is the plastic deformation of metal which is carried out
at temperature below the recrystallisation temperature
at temperature above the recrystallisation temperature
at temperature equals to boiling point of water
none of the above
Castings are usually
costlier than forgings
cheaper than forgings
at the same rate as forging for similar metal
None of the above
What is the process, in which the metal is caused to flow through a restricted orifice to create an extremely elongated strip of uniform and comparatively smaller cross-sectional area, called?
Rolling
Drawing
Extrusion
Spining
Which of the following is not a part of carriage of the centre lathe?
Tool post
Apron
Compound rest
Gear box control
Why are the plasticisers added with polymers?
To hold other constituents of plastic together
To reduce the cost and enhance the strength and hardness of plastics
To improve flexibility and to reduce the temperature and pressure required for moulding of plastics
None of the above
Specific gravity of the plastics is usually
less than the specific gravity of metals
More than the specific gravity of metals
similar to the specific gravity of metals
Unpredictable
Which of the following is an example of thermoplastic material?
Camera bodies
Auto mobile parts
Electric plugs
Electric insulation
Which plastic materials contain strong cross linkings in their molecular structure?
Thermoplastic materials
Thermosetting materials
Both a. and b.
None of the above
Which plastic materials contain strong cross linkings in their molecular structure?
Thermoplastic materials
Thermosetting materials
Both a. and b.
None of the above
Thermosetting materials are
the plastics which can be softened even after they have set and hardened
the plastics which require heat and pressure to mould them into shape
Both a and b
None of the above
Which of the following statements are correct for plastic?
1. Plastic is a non-metallic material that can be moulded to any shape
2. Plastic is a natural or synthetic resin
3. Plastic is of organic nature composed of hydrogen, oxygen, carbon and nitrogen
only statements 1 and 2 correct, statement 3 is wrong
only statements 1 and 3 correct, statement 2 is wrong
only statements 2 and 3 correct, statement 1 is wrong
all of above statements 1, 2 and 3 are correct
Cold working process is the plastic deformation of metal which is carried out
at temperature below the recrystallisation temperature
at temperature above the recrystallisation temperature
at temperature equals to boiling point of water
None of the above
Blow holes in casting are caused by
excessive moisture
low permeability
excessive fine grains
all of the above
Which casting process has no size and shape limits?
Sand casting
Shell-mould casting
Plaster-mould casting
None of the above
The productivity of casting process is comparatively
lower than the productivity of other automatic processes like rolling
higher than the productivity of other automatic processes like rolling
similar to the productivity of other automatic processes like rolling
Unpredictable
Which of the following sentences is/are correct for casting process?
Casting process is comparatively costly
Objects of larges sizes cannot be produced easily by casting process
The time required for the process of making casting is quite long
All the above
What is the highest possible percentage of clay contents in loam sand?
10
20
30
50
The sand in its natural or moist state is called as
green sand
Dry sand
Loam sand
None of the above
The ability of the moulding sand to withstand the heat of melt without showing any sign of softening is called as
strength or cohesiveness
refractiveness
collapsibility
adhesiveness
Permeability can be defined as the property of moulding sand
to allow gases to escape easily from the mould
to hold sand grains together
to withstand the heat of melt without showing any sign of softening
None of the above
The patterns which are made in two or more pieces are called as
solid patters
split patterns
loose piece patterns
Match plate patterns
Which of the following is not a requirement of a good pattern?
It should be light in weight to handle easily
It should be smooth to make casting surface smooth
It should have low strength to break it and to remove casting easily
None of the above
A model of casting, constructed to use for forming a mould in damp sand, is called as
sand construction
Pattern
Cover
None of the above
Match the following contents of green sand in Group 1 with their approximate per cent in Group 2.
1. Silica--- A. 5 to 10 per cent
2. Clay ---------- B. 2 to 5 per cent
3. Bentonite -- C. 8 to 15 per cent
4. Coal dust ---- D. 7 to 8 per cent
5. Water ----- E. up to 75 per cent
1-(E), 2-(C), 3-(B), 4-(A), 5-(D)
1-(E), 2-(A), 3-(B), 4-(C), 5-(D)
1-(C), 2-(D), 3-(B), 4-(A), 5-(E)
1-(C), 2-(A), 3-(B), 4-(D), 5-(E)
The volume of metal that enters the rolling stand
should increase after rolling process
should decrease after rolling process
should remain same after rolling process
Unpredictable
Which is not the type of pattern allowance
Draft allowance
Surface allowance
Shrinkage allowance
Distortion allowance
Name the missing part of the pattern in the diagram labelled as (?).
Core
Riser
Sprue
Mold cavity
Which of the following is not a part of the pattern at most times?
Mould cavity
Core
Molten metal
Cope
What is a function of a riser in a sand casting?
Provide good mobility to the molten metal
Prevent cavities due to shrinkage
To develop holes or hollow cavities in the casting
To provide differential cooling rates in specific areas of the casting
