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Chapter:

31. Which of following code is used to specify feed per minute in milling and drilling?

G69 G10 G00 G94

G94

G94 is used to specify feed per minute in milling and drilling.

Hint Answer

32. To prevent heavier and lighter impurities which of following system is used?

Skim bob Pouring basin Strainer Splash core

Skim bob

Skim bob is a hollow above runner that acts to skim off floating dross, sand and debris so it does not enter casting.

Hint Answer

33. Assertion (A): Chills are used to reduce shrinkage porosity.
Reason (R): function of chill is to increase rate of solidification in a critical region.

Both A and R is correct, and R is a correct explanation for A Both A and R is correct, and R is an incorrect explanation for A A is wrong but R is correct A is correct but R is wrong

Both A and R is correct, and R is a correct explanation for A

Chills are used to reduce shrinkage porosity and function of chill is to increase rate of solidification in critical region.

Hint Answer

34. In order to reduce chances of damage due to withdrawing of a pattern from mould is done by giving ____

Draft allowance Shrinkage allowance Distortion allowance Shake allowance

Draft allowance

While removing pattern from mould, parallel surface to direction at which pattern being withdrawn has a chance of getting damaged. The draws allowance will allow this easy removal of pattern from old and does not affect actual dimension of casting.

Hint Answer

35. Time required to fill mould by vertical gating system is?

Less to bottom gating system More to bottom gating system Equal to bottom gating system Sometimes more and sometimes less to bottom gating system

Less to bottom gating system

Time required to fill mould by vertical gating system is less than bottom gating system.

Hint Answer

36. What is dimensional accuracy in powder metallurgy?

High Medium Low Sometimes high and sometimes low

High

The powder metallurgy process yields net-shape, r near-net-shape parts, so that little or no machining is required to obtain a finished part in many cases. Thus, process offers dimensional tolerances and mechanical properties compatible with many applications.

Hint Answer

37. Which one of following expands during solidification?

Mild steel Grey cast iron Aluminium Copper

Grey cast iron

Grey cast iron expands upon solidification, as graphite has a relatively high specific volume and it precipitates as graphite flakes during solidification, it causes a net expansion of metal.

Hint Answer

38. Which of following code is used to select x y plane in milling?

G18 G17 G10 G04

G17

G17 is used to select x y plane in milling.

Hint Answer

39. Which of following code is used to specify feed per revolution in milling and drilling?

G24 G23 G95 None of the mentioned

G95

G95 is used to specify feed per revolution in milling and drilling.

Hint Answer

40. Sintering is done to _________

increase final strength decrease final strength initially increase and then to decrease the strength initially decrease and then to increase the strength

increase final strength

Sintering is a heat treatment commonly used to increase strength and structural integrity of a material. Powder metallurgy use sintering to convert metal powders to end-use parts.

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

Which of following code is used to specify feed per minute in milling and drilling?

To prevent heavier and lighter impurities which of following system is used?

Assertion (A): Chills are used to reduce shrinkage porosity.
Reason (R): function of chill is to increase rate of solidification in a critical region.

In order to reduce chances of damage due to withdrawing of a pattern from mould is done by giving ____

Time required to fill mould by vertical gating system is?

What is dimensional accuracy in powder metallurgy?

Which one of following expands during solidification?

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

Which of following code is used to specify feed per revolution in milling and drilling?

Sintering is done to _________

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