Which of these factors causes more porosity to form toward the interior of a casting rather than toward the outside? (a) Gasses are less soluble in the solid metal than the liquid, so solidified areas push dissolved gasses toward the interior. (b) Casting under a vacuum causes gasses near the liquid metal surface to be drawn out of the liquid during solidification. (c) The feeding structures of the mold are designed to force entrapped air into the center of the casting. (d) Draft on the mold wall forces air bubbles toward the interior of the solidifying metal. (e) None of the above Non-eutectic alloys (most commercial alloys) solidify over a temperature range. Which of the following statements explains how this affects the casting process. (a) Solidified non-eutectic alloys are especially difficult to remove from metal dies (b) Non-eutectic alloys have significantly less fluidity than pure metals or eutectic alloys. (c) Non-eutectic alloys solidify starting from the outside of the casting. (d) Cooling passages must be put into molds for these alloys to reduce the temperature range over which solidification takes place. (e) None of the above

Which of these factors causes more porosity to form toward the interior of a casting rather than toward the outside? (a) Gasses are less soluble in the solid metal than the liquid, so solidified areas push dissolved gasses toward the interior. (b) Casting under a vacuum causes gasses near the liquid metal surface to be drawn out of the liquid during solidification. (c) The feeding structures of the mold are designed to force entrapped air into the center of the casting. (d) Draft on the mold wall forces air bubbles toward the interior of the solidifying metal. (e) None of the above Non-eutectic alloys (most commercial alloys) solidify over a temperature range. Which of the following statements explains how this affects the casting process. (a) Solidified non-eutectic alloys are especially difficult to remove from metal dies (b) Non-eutectic alloys have significantly less fluidity than pure metals or eutectic alloys. (c) Non-eutectic alloys solidify starting from the outside of the casting. (d) Cooling passages must be put into molds for these alloys to reduce the temperature range over which solidification takes place. (e) None of the above

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: Pure aluminium is poured into a sand mold. The metal level in the pouring basin is 203.2 mm above…

A: Given, Height of the pouring basin , h = 203.2 mm Diameter of the runner , d =7.62 mm Density of…

Q: How can density effect in sand casting operation and how we can plan an experiment to see the effect…

A: The density degree of molding sand is a factor that depends on the material properties and initial…

Q: the amount of heat that must be removed from the molten metal making a cavity in the casting between…

A: Superheat of the metal is the temperature above the melting point at which the molten metal is…

Q: 12.Silica sand has which one of the following compositions: (a) Al2O3, (b) SiO, (c) SiO2, or (d)…

A: 12. Silica is SiO2 (option c) 13. Misrun is a casting defect in which casting cavity not filled…

Q: A vertical gating system has a sprue height of 250 mm, one ingate located 150 mm below the mould top…

A: According to the Bernoulli's equation, the velocity of the fluid at any cross section which is…

Concept explainers

Metal Casting

Metal casting is described as a manufacturing process in which a mold cavity is produced by sand, and molten metal is filled inside a mold cavity. The desirable shaped object is achieved after the solidification of molten metal. Large metal objects like machine beds, motor bodies, and others can easily be manufactured using metal casting. The place or shop where metal casting is performed is called foundry.

Question

Which of these factors causes more porosity to form toward the interior of a casting rather than toward the
outside?
(a) Gasses are less soluble in the solid metal than the liquid, so solidified areas push dissolved gasses
toward the interior.
(b) Casting under a vacuum causes gasses near the liquid metal surface to be drawn out of the liquid
during solidification.
(c) The feeding structures of the mold are designed to force entrapped air into the center of the casting.
(d) Draft on the mold wall forces air bubbles toward the interior of the solidifying metal.
(e) None of the above
Non-eutectic alloys (most commercial alloys) solidify over a temperature range. Which of the following
statements explains how this affects the casting process.
(a) Solidified non-eutectic alloys are especially difficult to remove from metal dies
(b) Non-eutectic alloys have significantly less fluidity than pure metals or eutectic alloys.
(c) Non-eutectic alloys solidify starting from the outside of the casting.
(d) Cooling passages must be put into molds for these alloys to reduce the temperature range over which
solidification takes place.
(e) None of the above

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

What is the advantage in casting turbine blades that have either highly aligned grain boundaries or no grain boundaries at all?
When casting a 4x10x20 in. Part, which has a top overflow with a H / D = 1.5 ratio, you want to determine the height and diameter of the overflow to prevent shrinkage in the part to be cast. Note: Remember that to achieve this, the overflow has to solidify some time after the piece has solidified, since in this case the overflow acts as a riser.
6. The part of gating system which regulates the rate of pouring of molten metal in the mold is called 7. High refractoriness of a material refers to its. b. Chemical strength towards other material d. Ability to get dissolved in molten metal a. Slipperiness of the material c. Strength to withstand high temperature e. None of the above Your answer is: . 8. Usually weaker constituent of a composite is called . 9. Which polymer is the most important commercially: a. thermoplastics c. elastomers b. thermosets d. all of the above e. None of the above Your answer is: 10. Which of the following casting processes are expendable mold operations: a. centrifugal casting c. investment casting e. sand casting b. die casting d. low pressure casting f. None of the above Your answer is:
Please show all of your work, thank you!
Please show all of your work, thank you!
Pouring Calculations A mold sprue is 25 cm long, and the cross-sectional area at its base is 3.0 cm2. The sprue feeds a horizontal runner leading into a mold cavity whose volume is 1700 cm3. Determine: (a) velocity of the molten metal at the base of the sprue, (b) volume rate of flow, and (c) time to fill the mold. (The acceleration of gravity g = 981 cm/s2) use cm keep all unit in cm
Problem 1. Chapter 10 Pouring Calculations A mold sprue is 25 cm long, and the cross-sectional area at its base is 3.0 cm². The sprue feeds a horizontal runner leading into a mold cavity whose volume is 1700 cm³. Determine: (a) velocity of the molten metal at the base of the sprue, (b) volume rate of flow, and (c) time to fill the mold. (The acceleration of gravity g = 981 cm/s²)
Please I need answer with Details
(a) Explain the purpose of a riser when used in sand casting and how the following empirical formula for Total Solidification Time (TTS) can be useful in this context. V is the volume of the casting, A is the surface area of the casting, whilst Cm and n are coefficients. TTS 2 (7) ² = Cm
3) What are the means of elastic and plastic deformations? List the passageway (gating system) elements in sand casting moulds and show them with drawing?
what solidification time is required for a casting of 9.5 cm3 and a mold contact area of 10 cm2? The mold constant is 838 s/cm2.
In turbine blade casting, how is a single-crystal structure achieved? Select one or more: a. By using a curving coil-like channel in the casting mould b. By removing grain boundaries by hot working and recrystallisation c. By careful control of the temperatures of the mould d. By introducing impurities into the molten alloy in the mould