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WorksheetsMFT-I - UNIT-I
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
The ability of the moulding sand to withstand the heat of melt without showing any sign of softening is called as
a)
Strength or Cohesiveness
b)
Refractoriness
c)
Collapsibility
d)
Adhesiveness
2.
A model of casting, constructed to use for forming a mould in damp sand is called as
a)
Sand Construction
b)
Pattern
c)
Cover
d)
None of The Above
3.
Which of the following is not a requirement of a good pattern?
a)
It should be light in weight to handle easily
b)
It should be smooth to make casting surface smooth
c)
It should have low strength to break it and to remove casting easily
d)
None of the above
4.
The patterns which are made in two or more pieces are called as
a)
Solid Patters
b)
Split Patterns
c)
Loose Piece Patterns
d)
None of The Above
5.
Permeability can be defined as the property of moulding sand
a)
To hold sand grains together
b)
To allow gases to escape easily from the mould
c)
To withstand the heat of melt without showing any sign of softening
d)
None of the above
6.
The sand in its natural or moist state is called as
a)
Green Sand
b)
Loam Sand
c)
Dry Sand
d)
None of The Above
7.
What is the highest possible percentage of clay contents in loam sand?
a)
10
b)
20
c)
30
d)
50
8.
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
a)
1-(E), 2-(C), 3-(B), 4-(A), 5-(D)
b)
1-(E), 2-(A), 3-(B), 4-(C), 5-(D)
c)
1-(C), 2-(D), 3-(B), 4-(A), 5-(E)
d)
1-(C), 2-(A), 3-(B), 4-(D), 5-(E)
9.
Which of the following sentences is/are correct for casting process?
a)
Casting process is comparatively costly
b)
Objects of large sizes cannot be produced easily by casting process
c)
The time required for the process of making casting is quite long
d)
All of the above sentences are correct
10.
The productivity of casting process is comparatively
a)
lower than the productivity of other automatic processes like rolling
b)
higher than the productivity of other automatic processes like rolling
c)
similar to the productivity of other automatic processes like rolling
d)
Unpredictable
11.
Which casting process has no size and shape limits?
a)
Sand casting
b)
Shell-mould casting
c)
Plaster-mould casting
d)
None of the above
12.
Blow holes in casting are caused by
a)
Excessive Moisture
b)
Low Permeability
c)
Excessive fine grains
d)
All of the above
13.
Investment casting is used for.......
a)
Shapes which are made by difficulty using complex patterns in sand casting
b)
Mass production
c)
Shapes which are very complex and intricate and can't be cast by any other method
d)
Stainless steel
14.
Centrifugal method of casting is used to.........
a)
Ensure purity and density at extremities of a casting
b)
Cast symmetrical objects
c)
Obtain high density and pure castings
d)
Use heavy cast iron mould to act as chill
15.
Which of the following casting methods utilises wax pattern......
a)
Shell moulding
b)
Centrifugal casting
c)
Pressure Die casting
d)
Investment casting
16.
The core in the centrifugal casting is made of.........
a)
Carbon steel
b)
Properly treated sand
c)
Plastic
d)
No core is used
17.
The hot chamber die casting method is used to cast......
a)
Brass
b)
Magnesium
c)
Aluminium
d)
All of the above
18.
Water pipes of large length and diameter are made by.......
a)
Semi-centrifugal casting
b)
Continuous casting
c)
Sand casting
d)
Forging
19.
The pattern used for mass production is
a)
Match Plate Pattern
b)
Split Pattern
c)
Skeleton Pattern
d)
Single Plate Pattern
20.
In casting, the amount of draft (in mm per metre) on exterior surfaces is about
a)
10-20
b)
20-30
c)
30-40
d)
40-50
21.
During sand conditioning, the items added and their qualities are given,
1 Silica-----------1. Helps in cooling the mould
2 Coal dust----------2. Increase adhesiveness
3 Clay---------3. Withstand high temperature
4 Water-----4. Impart necessary bond to the moulding sand
a)
1-2, 2-3, 3-1, 4-4
b)
1-3, 2-1, 3-2, 4-4
c)
1-3, 2-1, 3-4, 4-2
d)
1-2, 2-1, 3-3, 4-4
22.
Which of the following is not a casting defect?
a)
Swell
b)
Shrinkage
c)
Hot Tears
d)
Hot Cracks
23.
The function of cores in casting is to
a)
Form Extended Parts
b)
Form Internal Cavities
c)
Used for Directional Solidification
d)
None of The Above
24.
Which of the following sand is applied directly next to the surface of the pattern?
a)
Parting Sand
b)
Facing Sand
c)
Loam Sand
d)
Core Sand
25.
Green sand consists of
a)
70% Sand and 30% Clay
b)
40% Sand and 60% Clay
c)
30% Sand and 70% Clay
d)
60% Sand and 40% Clay
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