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WorksheetsCasting And Welding
Total questions: 40
Worksheet time: 21mins
Chills are used in casting moulds to
Achieve directional solidification
Reduce the roughness of top surface of the casting product
Increase the solidification time
Reverse excess molten metal
In sand casting fluidity of the molten metal increases with
Increases in degree of super heat
Decrease in pouring rate
Increase in thermal conductivity of mold
Increase in sand grain size
Which of the following casting processes uses expandable pattern and expandable mold
Shell mold casting
Investment casting
Pressure die casting
Centrifugal casting
Hot chamber die casting is NOT suited for
Lead and its alloys
Zinc and its alloys
Tin and its alloys
Aluminium and its alloys
Which one of the following is NOT a property of a sand mold?
Permeability
Collapsibility
Strength
Fluidity
The primary function of a riser is to
Feed molten metal to casting as it solidifies
Prevent atmospheric air from contaminating the metal in the mold
Allow gases to easily escape from mould cavity
Allow molten metal to raise above mould cavity
Investment casting uses (a) as pattern material and is preferred for small parts with simple and intricate designs.
Chaplets are placed between mold in order to
Promote directional solidification
Help alloying the metal
Facilitate easy removal of core from casting
Prevent core movement due to buoyancy
Ceramic slurry is used in making the molds for
Investment casting
Die casting
Shell mold casting
Centrifugal casting
For casting of turbine blades made of high temp and high strength alloys, the most suitable process is
Die casting
Investment Casting
Centrifugal casting
Slush Casting
Negative allowance is provided on the pattern to take care of
The distortion allowance
The draft allowance
The Machining allowance
The shake allowance
Poor collapsibility of the mold leads to (a) type of casting defect in aluminium castings.
Which of the following is not a casting defect
Scar
Scab
Hot Cracs
Hot Tears
Which casting defect occur due to excess moisture content in moulding sand
Porosity
Shrinkage
Blow holes
Inclusions
Runners, gates and risers are attached to the pattern to __________
Provide ease of cooling
Provide feed to the molten material
Provide design to the casting
Enhance the finishing of the casting
Which of the following statement is true?
Casting is the replica of the object to be cast
Pattern is the replica of the casting object
Casting and the pattern are same things
Molten material is casted into the casting cavity
Sprue in casting refers to.......
Gate
Runner
Riser
Vertical passage
The patterns which are made in two or more pieces are called as
Solid patters
Split patterns
Loose piece patterns
None of the above
The sand in its natural or moist state is called as
Green sand
Loam sand
Dry sand
None of the above
Why are core prints added to the patterns when cores are used?
They provide different cooling rates to the core
They provide support to the cores and strength to the mould and core itself
They are used to ease the removal of a core
The liquid metal that runs through the channels without friction in the mould obeys which of the following theorem?
Bernoulli’s theorem
Clausius theorem
Helmholtz’s theorem
Carnot’s theorem
Centrifugal method of casting is used to.........
Ensure purity and density at extremities of a casting
Cast symmetrical objects
Obtain high density and pure castings
Use heavy cast iron mould to act as chill
Ornaments are cast by.......
Die casting
Continuous casting
Pressed casting
Centrifugal casting
Defect which occurs due to the solidification of casting is known as?
Swell
Misrun
Metal penetration
Shrinkage cavity
In casting, which of the following are not material defects?
Cut and washes
Metal penetration
Fusion
Hot tears
Which of the following is not a type of arc welding?
Plasma
Electro-slag
Submerged
Air-acetylene
The heat generated in resistance welding is expressed by
2I2RT
I2RT
IRT2
4I2RT
The type of joint used in spot welding is
Butt welding
Lap welding
Corner welding
Edge welding
In a _______ welding process the electrode is non-consumable.
GTAW
SMAW
MIG
GMAW
How to specify the size of an electrode holder ?
By its weight
By its shape
By its current carrying capacity
By the metal used for making it
What is the reason for selecting DC reverse polarity for welding copper by arc ?
Copper is a good conductor of heat.
Copper when melted does not flow freely.
1/3rd of arc heat is concentrated on the electrode.
2/3rd of the arc heat is concentrated on the electrode.
The carburizing or reducing flame is more often used for the welding of
low carbon steel ,cast steel, cast iron etc
Manganese steel, brass and bronze etc
Aluminium and nickel etc
none of the above
In oxy-acetylene welding a oxidizing flame is obtained by supplying
excess volume of oxygen over acetylene
equal volume of oxygen and acetylene
excess volume of acetylene over oxygen
none of the above
Type of electrode is used in Submerged Arc Welding (SAW)
Bare wire
Light coated electrode
Heavy coated electrode
None of the above
The only difference between MIG and MAG welding variants is
Welding position
Metal transfer
Type of shielding gas used
Type of electrode used
Up to what thickness, can steel be welded using spot welding process?
10 mm
11 mm
12 mm
13 mm
What is the function of flux in submerged arc welding?
To completely cover the welded zone
To prevent oxidation of joint
To prevent spattering of molten metal
To prevent sticking of molten metal
In plasma arc welding the gas is?
Ionized
Heated
Magnetized
Vaporized
The deflection of the arc in arc blow is by?
Electric field
Magnetic field
Combination of both
Hydrostatic field
In welding, two parts are joined by bringing them to a temperature of?
Above melting point temperature
Below melting point temperature
Equal to melting point temperature
Equal to Curie temperature
