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Metal-casting Questions Set 23:

Quiz Mode

What casting defect is caused by erosion of sand in a mold?

Drops

Mismatch

Rat tail

Scabs

Solution:

What is the formula for calculating choke area?

W²/dtC√2gh

2W/dtC√2gh

2W³/dtC√2gh

W/dtC√2gh

Solution:

What is the method used to produce cast iron and steel pipes?

Slush casting

Investment casting

True centrifugal casting

Die casting

Solution:

What is the purpose of auxiliary tuyeres?

Drop solidification efficiency

Raise melting efficiency

Raise solidification efficiency

Drop melting efficiency

Solution:

The hot tearing in a metal casting is caused by

Wide range of solidification temperature

High fluidity

High melt temperature

Low coefficient of thermal expansion

Solution:

Hardness of green sand mould increases with

Increase in moisture content beyond 6 percent

Increase in permeability

Decrease in permeability

Increases in both moisture content and permeability

Solution:

Porosity in castings is caused by:

Decreased solubility of gases in metal during solidification

Presence of non-metallic particles in the metal

Thermal expansion of the mold

Prior solidification of the moving face of the melt

Solution:

Select the correct statements about casting defects

A blister is a shallow blow like scar with a thin layer of metal covering it

Both (a) and (b)

A scar is a shallow blow which occurs on a flat surface of the castings

None of the above

Solution:

What is a loose piece pattern used for?

Making intricate shapes where removal of all portions of the pattern is not possible

Large and axis symmetrical castings

Large scale continuous production in machine moldings

Intricate castings split at parting line

Solution:

Consider the following data for a vertical centrifugal casting process:

Vertical length of the casting (L) = 12.8 m

Inside radius at the top of the casting (R_t) = 5 m

Inside radius at the bottom of the casting (R_b) = 3 m

What is the value of the rotating speed of this casting? (Take g = 10 m/s², π = 3.1416)

120/π

60/π

30/π

240/π

Metal-casting Questions Set 23:

What casting defect is caused by erosion of sand in a mold?

Solution:

What is the formula for calculating choke area?

Solution:

What is the method used to produce cast iron and steel pipes?

Solution:

What is the purpose of auxiliary tuyeres?

Solution:

The hot tearing in a metal casting is caused by

Solution:

Hardness of green sand mould increases with

Solution:

Porosity in castings is caused by:

Solution:

Select the correct statements about casting defects

Solution:

What is a loose piece pattern used for?

Solution:

Solution:

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