Manufacturing processes 20- Which of the following metals is used for the preparation of patterns in shell molding?*a. Aluminumb. Сopperc. Grey cast irond. Brass21- At the last of shell molding procedure, the Dump box is rotated backward for adhering of as much as thepossible amount of sand to the metallic pattern.a. Trueb. False22- There is no need for any external support for the shells at the time of pouring of molten metal.a. Trueb. False23- Which of the following is used as the pattern material in precision investment casting?a. Metalb. Molten waxc. Plasticd. Wood24- Molten metal is poured into the mold; meanwhile it removes the wax by melting it and vaporization ofwax takes place simultaneously in the investment casting.a. Trueb. False25- Investment casting is not suitable for producing complex shapes of castings.a. Trueb. False26- Castings produced by investment casting do not require any further machining for the finishing of thesurface.a. Trueb. False27- Aelectrode is inserted into the gun and made cathode and nozzle of the gun are madeanode.а. соррerb. aluminuimc. tungstend. steel

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20- Which of the following metals is used for the preparation of patterns in shell molding? a. Aluminum b. Сopper c. Grey cast iron d. Brass

Elements Of Electromagnetics

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ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

Manufacturing processes

20- Which of the following metals is used for the preparation of patterns in shell molding?
*
a. Aluminum
b. Сopper
c. Grey cast iron
d. Brass
21- At the last of shell molding procedure, the Dump box is rotated backward for adhering of as much as the
possible amount of sand to the metallic pattern.
a. True
b. False
22- There is no need for any external support for the shells at the time of pouring of molten metal.
a. True
b. False
23- Which of the following is used as the pattern material in precision investment casting?
a. Metal
b. Molten wax
c. Plastic
d. Wood
24- Molten metal is poured into the mold; meanwhile it removes the wax by melting it and vaporization of
wax takes place simultaneously in the investment casting.
a. True
b. False
25- Investment casting is not suitable for producing complex shapes of castings.
a. True
b. False
26- Castings produced by investment casting do not require any further machining for the finishing of the
surface.
a. True
b. False
27- A
electrode is inserted into the gun and made cathode and nozzle of the gun are made
anode.
а. соррer
b. aluminuim
c. tungsten
d. steel

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