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
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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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
Transcribed Image Text: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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