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Chapter:

21. For good dimensional tolerances and smooth surface which of following is used as pattern material?

Wood Plastics Metals Ceramics

Metals

The primary benefits of using ceramic patterns are as follows: 1. It is a reusable pattern, 2. close dimensional accuracy, 3. excellent surface finish. There are two types of ceramic mold casting known as ?unicast process? and ?shaw process?.

Hint Answer

22. Which of following code is used to cancel offset compensation for cutter radius?

G40 G02 G42 G00

G40

G40 is used to cancel offset compensation for cutter radius.

Hint Answer

23. Which of following term can be used to describe flask?

Drag Cope Check Chill

Chill

Drag is situated at lower molding flask, cope is situated at upper molding flask, check is situated at intermediate molding flask.

Hint Answer

24. Which of following code will give circular interpolation in Counterclockwise direction?

G00 G56 G69 G03

G03

G03 will give circular interpolation in Counterclockwise direction.

Hint Answer

25. Which of following code is used in programming in incremental coordinates?

G90 G91 G92 G94

G91

G91 is used in programming in incremental coordinates.

Hint Answer

26. Which of following code is used in programming in absolute coordinates?

G90 G32 G92 G01

G90

G90 is used in programming in absolute coordinates.

Hint Answer

27. The passage of gaseous material, water and steam vapor through molding sand is known as?

Plasticity Flowability Permeability Refractoriness

Permeability

The passage of gaseous material, water and steam vapor through molding sand is known as permeability. Sand which are coarse or have rounded grains exhibit more permeability. In absence of adequate permeability, defects like surface blows, gas holes, mold blast etc. may be experienced.

Hint Answer

28. Which one of following is a negative allowance?

Draft allowance Shrinkage allowance Shake allowance Machining allowance

Shake allowance

All metals shrink when cooling except perhaps bismuth. This is because of inter-atomic vibrations which are amplified by an increase in temeprature. The shrinkage allowance is always to be added to linear dimensions. Even in case of internal dimensions.

Hint Answer

29. Which of following sand contains clay up to 50% and dries hard?

Green sand Facing sand Loam sand Dry sand

Loam sand

Loam sand contains clay up to 50% and dries hard. It covers less part of mould. This sand is used for loam sand moulds for making very heavy castings usually with help of sweeps and skeleton patterns.

Hint Answer

30. Which of following will have better plasticity?

Coarse sand Fine grained sand Semi grained sand Plasticity does not depend on sand grain size

Fine grained sand

Plasticity is ability of sand particles to undergo unrecoverable deformation at constant volume without cracking and crumbling. Fine grained sand particles will have better plasticity.

Hint Answer

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All Chapters

View all Chapter and number of question available From each chapter from Manufacturing-engineering-I

Crystallography and Defects in Solid

Crystallography and Defects in Solid

Mechanical Properties and Testing and Phase Diagram

Mechanical Properties and Testing and Phase Diagram

Ferrous Metal, Non-Ferrous Metal and Heat Treatment

Ferrous Metal, Non-Ferrous Metal and Heat Treatment

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

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

Metal Cutting

Cutting-Tool Materials and Cutting Fluids

Cutting-Tool Materials and Cutting Fluids

Lathe Machines, Shaping and Slotting

Lathe Machines, Shaping and Slotting

Milling, Drilling and Reaming

Milling, Drilling and Reaming

Grinding, Surface Finishing Operations and Unconventional Machining Processes

Grinding, Surface Finishing Operations and Unconventional Machining Processes

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

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

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

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

Forming, Metal Forming Processes and Heat Transfer

Forming, Metal Forming Processes and Heat Transfer

Jigs and Fixture, Applications and Gears

Jigs and Fixture, Applications and Gears

Topics

This Chapter consists of the following topics

Powder Metallurgy

NC Part Programming and Metal Casting and Gating Systems

For good dimensional tolerances and smooth surface which of following is used as pattern material?

Which of following code is used to cancel offset compensation for cutter radius?

Which of following term can be used to describe flask?

Which of following code will give circular interpolation in Counterclockwise direction?

Which of following code is used in programming in incremental coordinates?

Which of following code is used in programming in absolute coordinates?

The passage of gaseous material, water and steam vapor through molding sand is known as?

Which one of following is a negative allowance?

Which of following sand contains clay up to 50% and dries hard?

Which of following will have better plasticity?

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