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Chapter:

16. When sand is in its natural moist state it is known as?

Green sand Facing sand Loam sand Dry sand

Green sand

Green sand is a mixture of silica sand with 18-30% clay, having a water content in range 6-8%. This name got its name ?green? in sense of ?not ready? or ?not processed? meaning.

Hint Answer

17. The strength of sand which is required to hold shape of mould cavity when metal in mould is still in liquid form is known as?

Hot strength Green strength High strength Refractoriness of the sand

Hot strength

When moisture in sand being eliminated, sand would reach at a high temperature when metal in mold is still in liquid state. The strength of sand that is required to hold shape of cavity is called hot strength.

Hint Answer

18. In powder metallurgy, range of particle size (in microns) is?

4 to 200 0.300 to 0.003 100 to 2000 5000 to 6000

4 to 200

Range of particle size in powder to be used for powder metallurgy should vary from 4 microns to 200 microns. Powder metallurgy has small wastage of material.

Hint Answer

19. Solidification of casting does not depend upon which factor?

Type of metal Thermal properties of metal Geometric relationship between volume and surface area Surface tension

Surface tension

Surface tension is a fluid property and solidification time of casting does not depend upon any fluid property.

Hint Answer

20. Which of following code is used to select y-z plane in milling?

G32 G00 G02 G19

G19

G19 is used to select y-z plane in milling.

Hint Answer

21. According to Chvorinov’s rule solidification time is a function of volume and surface area and is given by relationship between volume, area and some exponential power ‘n’. What is value of n?

1 2 3 4

2

Chvorinov?s rule states that: t_s = \(B�(\frac{V}{A})^n\), where t_s is time of solidification, v = volume, A = surface area, n = 1.5 to 2 and B is a constant for metal cast, mold material and casting conditions.

Hint Answer

22. Process of forming metal powder by directing molten metal through an orifice after which it is break into small particle using high pressure fluid is known as?

Atomization Reduction Crushing Electrolysis

Atomization

The disintegration of a molten metal into particles by a rapidly moving gas or liquid stream or by or means is known as atomization.

Hint Answer

23. Which of following code is used to specify feed per minute in turning?

G25 G98 G24 G23

G98

G98 is used to specify feed per minute in turning.

Hint Answer

24. If velocity of metal flow at gate is 4m/sec, volume of mould is .1 cubic meters and cross-sectional area of gate is 0.002 cubic meters n time required to fill up mould in seconds is?

10 12 12.5 15.5

12.5

t = [v/ (a*V)], where v is volume, V is velocity, a is area and t is time taken to fill mould.

Hint Answer

25. What is function of cores used in casting?

To remove dissolved gases To avoid defects To form hollow region To reduce shrinkage porosity

To form hollow region

Cores form internal cavities inside structure which will n leads to final casting shape with hollow structure. Sand inside cores and pattern gives strength and rigidity to casting structure.

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

When sand is in its natural moist state it is known as?

The strength of sand which is required to hold shape of mould cavity when metal in mould is still in liquid form is known as?

In powder metallurgy, range of particle size (in microns) is?

Solidification of casting does not depend upon which factor?

Which of following code is used to select y-z plane in milling?

According to Chvorinov’s rule solidification time is a function of volume and surface area and is given by relationship between volume, area and some exponential power ‘n’. What is value of n?

Process of forming metal powder by directing molten metal through an orifice after which it is break into small particle using high pressure fluid is known as?

Which of following code is used to specify feed per minute in turning?

If velocity of metal flow at gate is 4m/sec, volume of mould is .1 cubic meters and cross-sectional area of gate is 0.002 cubic meters n time required to fill up mould in seconds is?

What is function of cores used in casting?

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