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WorksheetsFoundry Technology MCQs
Total questions: 27
Worksheet time: 14mins
What is the primary source of heat in an electric arc furnace?
Chemical reaction
Electric arc between electrodes and metal
Induction coils
Fuel combustion
In a direct arc furnace, the arc is formed:
Between the electrodes and the furnace wall
Directly between the electrodes and the metal charge
Between two electrodes without contacting the charge
Through induction coils
Which type of electric arc furnace is more suitable for melting steel?
Indirect arc furnace
Direct arc furnace
Induction furnace
Crucible furnace
In an indirect arc furnace, the heat is transferred to the metal:
Directly through the arc
By radiation from the arc to the furnace walls and then to the metal
Through induction currents
By conduction through the electrodes
What is a key advantage of an indirect arc furnace over a direct arc furnace?
Higher melting capacity
Lower electrode consumption
Suitable for large-scale production
Faster melting rate
What principle does an induction furnace use to melt metal?
Combustion of fuel
Electromagnetic induction
Electric arc generation
Chemical reaction
Which type of metal is an induction furnace most suitable for melting?
Only ferrous metals
Only nonferrous metals
Both ferrous and nonferrous metals
Only high-carbon steel
What is a major advantage of an induction furnace?
Low initial cost
Precise temperature control and clean melting
High fuel efficiency
Large-scale melting capacity
What is a limitation of an induction furnace?
Inability to melt nonferrous metals
High initial setup cost
Slow melting process
Inability to melt small quantities
What is the primary force used in gravity die casting to fill the mould?
Centrifugal force
Gravity
High pressure
Vacuum
Which material is commonly used for the mould in gravity die casting?
Sand
Metal
Wax
Plaster
What is an advantage of gravity die casting over sand casting?
Lower cost of moulds
Better surface finish and dimensional accuracy
Suitable for very large castings
Faster cooling rate
What is the primary binder used in green sand moulding?
Resin
Clay
Sodium silicate
Oil
What is a key characteristic of green sand moulding?
The sand is dry during moulding
The sand contains moisture and is used in its wet state
The sand is heated before use
The sand is used without any binder
What is a limitation of green sand moulding?
High cost of materials
Lower dimensional accuracy compared to die casting
Inability to cast complex shapes
Slow production rate
How does dry sand moulding differ from green sand moulding?
Dry sand moulds are baked or dried before casting
Dry sand moulds use no binder
Dry sand moulds are used in a wet state
Dry sand moulds are only used for nonferrous metals
What is an advantage of dry sand moulding over green sand moulding?
Lower cost
Higher mould strength and better surface finish
Faster moulding process
Suitable for very small castings only
What is a disadvantage of dry sand moulding?
Poor dimensional accuracy
Longer preparation time due to drying process
Inability to cast large components
Low mould strength
What force is used to distribute molten metal in centrifugal casting?
Gravity
Centrifugal force
High pressure
Vacuum
Which type of casting is centrifugal casting most suitable for?
Flat, thin-walled castings
Cylindrical or symmetrical castings
Complex, intricate castings
Large, solid castings
What is a key advantage of centrifugal casting?
Low cost of equipment
High density and fewer defects in castings
Suitable for all metal types
Fast cooling rate
In hot chamber die casting, the furnace is:
Separate from the injection system
Integrated with the injection system
Located outside the casting machine
Not used
Which metals are typically used in hot chamber die casting?
High-melting-point metals like steel
Low-melting-point metals like zinc and magnesium
Only nonferrous metals with high density
Only ferrous metals
What is the primary difference between hot chamber and cold chamber die casting?
Cold chamber uses a separate furnace for melting metal
Hot chamber uses higher pressure
Cold chamber is used for low-melting-point metals
Hot chamber requires no mould
Which process is more suitable for casting aluminum and copper alloys?
Hot chamber die casting
Cold chamber die casting
Green sand moulding
Centrifugal casting
What is a common advantage of hot chamber die casting?
Suitable for high-melting-point metals
Faster cycle times due to integrated furnace
Lower equipment cost
Better for large castings
What is a limitation of cold chamber die casting?
Inability to cast nonferrous metals
Slower cycle times compared to hot chamber
Poor dimensional accuracy
Inability to cast small components
