36. The riser is a reservoir of molten metal provided in casting so that hot metal can flow back into mould cavity when re is a reduction in volume of metal due to?

Compression Solidification Expansion Melting

Hint Answer

37. Which one of following will not give good dimensional accuracy in presence of moisture?

Wood Plastics Metals Ceramics

Hint Answer

38. In gate area for non-pressurized casting gating ratio a:b:c? (gating ratio = a: b: c where, a = cross-sectional area of sprue, b: cross-sectional area of runner, c = total cross-sectional area of ingates).

1:2:2 2:2:1 1:4:4 1:4:2

S.No.	Pressurized gating systems	Unpressurized gating systems
1	Gating ratio may be of order of 3:2:1	Gating ratio may be of order of 1:3:2
2	Air aspiration effect is minimum	Air aspiration effect is more
3	Volume flow of liquid from every ingate is almost equal	Volume flow of liquid form every ingate is different
4	They are smaller in volume for a given flow rate of metal. Therefore, casting yield is higher.	They are larger in volume because y involve large runners and gates as compared to pressurized system and thus cast yield is reduced.
5	Velocity is high, severe turbulence may occur at corners.	Velocity is low and turbulence is reduced.

Hint Answer

39. Which one of following statement is not true regarding Contraction?

Contraction of liquid takes place from the pouring temperature to the freezing temperature Contraction is associated with the change of phase from liquid to solid Contraction of solid is from the freezing temperature to the room temperature Contraction is not associated with the change of phase from liquid to solid

Hint Answer

40. Green strength of sand does not depend upon?

Grain size Moisture content Shape and distribution of sand Refractoriness of the sand

Hint Answer

Powder Metallurgy

NC Part Programming and Metal Casting and Gating Systems

The riser is a reservoir of molten metal provided in casting so that hot metal can flow back into mould cavity when re is a reduction in volume of metal due to?

Which one of following will not give good dimensional accuracy in presence of moisture?

In gate area for non-pressurized casting gating ratio a:b:c? (gating ratio = a: b: c where, a = cross-sectional area of sprue, b: cross-sectional area of runner, c = total cross-sectional area of ingates).

Which one of following statement is not true regarding Contraction?

Green strength of sand does not depend upon?

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You need to login to ask any Questions from chapter of Manufacturing-engineering-I

Chapter:

36. The riser is a reservoir of molten metal provided in casting so that hot metal can flow back into mould cavity when re is a reduction in volume of metal due to?

Solidification

37. Which one of following will not give good dimensional accuracy in presence of moisture?

Wood

38. In gate area for non-pressurized casting gating ratio a:b:c? (gating ratio = a: b: c where, a = cross-sectional area of sprue, b: cross-sectional area of runner, c = total cross-sectional area of ingates).

1:4:4

39. Which one of following statement is not true regarding Contraction?

Contraction is not associated with the change of phase from liquid to solid

40. Green strength of sand does not depend upon?

Refractoriness of the sand

All Chapters

Crystallography and Defects in Solid

Mechanical Properties and Testing and Phase Diagram

Ferrous Metal, Non-Ferrous Metal and Heat Treatment

Magnetic Properties of Material, Electrical Properties of Materials, Plastics, Ceramics and Composites

Metal Cutting

Cutting-Tool Materials and Cutting Fluids

Lathe Machines, Shaping and Slotting

Milling, Drilling and Reaming

Grinding, Surface Finishing Operations and Unconventional Machining Processes

Metrology, Welding, Fusion-Welding Processes and Unconventional Welding Methods

Powder Metallurgy, NC Part Programming and Metal Casting and Gating Systems

Forming, Metal Forming Processes and Heat Transfer

Jigs and Fixture, Applications and Gears

Topics

Guest You need to login to ask any Questions from chapter of Manufacturing-engineering-I

Chapter:

36. The riser is a reservoir of molten metal provided in casting so that hot metal can flow back into mould cavity when re is a reduction in volume of metal due to?

Solidification

37. Which one of following will not give good dimensional accuracy in presence of moisture?

Wood

38. In gate area for non-pressurized casting gating ratio a:b:c? (gating ratio = a: b: c where, a = cross-sectional area of sprue, b: cross-sectional area of runner, c = total cross-sectional area of ingates).

1:4:4

39. Which one of following statement is not true regarding Contraction?

Contraction is not associated with the change of phase from liquid to solid

40. Green strength of sand does not depend upon?

Refractoriness of the sand

All Chapters

Crystallography and Defects in Solid

Mechanical Properties and Testing and Phase Diagram

Ferrous Metal, Non-Ferrous Metal and Heat Treatment

Magnetic Properties of Material, Electrical Properties of Materials, Plastics, Ceramics and Composites

Metal Cutting

Cutting-Tool Materials and Cutting Fluids

Lathe Machines, Shaping and Slotting

Milling, Drilling and Reaming

Grinding, Surface Finishing Operations and Unconventional Machining Processes

Metrology, Welding, Fusion-Welding Processes and Unconventional Welding Methods

Powder Metallurgy, NC Part Programming and Metal Casting and Gating Systems

Forming, Metal Forming Processes and Heat Transfer

Jigs and Fixture, Applications and Gears

Topics

Powder Metallurgy

NC Part Programming and Metal Casting and Gating Systems

The riser is a reservoir of molten metal provided in casting so that hot metal can flow back into mould cavity when re is a reduction in volume of metal due to?

Which one of following will not give good dimensional accuracy in presence of moisture?

In gate area for non-pressurized casting gating ratio a:b:c? (gating ratio = a: b: c where, a = cross-sectional area of sprue, b: cross-sectional area of runner, c = total cross-sectional area of ingates).

Which one of following statement is not true regarding Contraction?

Green strength of sand does not depend upon?

Guest
You need to login to ask any Questions from chapter of Manufacturing-engineering-I