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Chapter:

11. The ductile materials, during machining, produces

continuous chips discontinuous chips continuous chips with built up edge none of the mentioned

continuous chips

Discontinuous chips are formed during machining of brittle metals while continuous chips are formed during machining of ductile materials.

Hint Answer

12. Which of following parameters govern value of shear angle in continuous chip formation?

true feed chip thickness rake angle of the cutting tool all of the mentioned

all of the mentioned

To find a shear angle in continuous chip feed, rake angle, chip thickness, cutting ratio are required.

Hint Answer

13. Flank wear depends upon

hardness of the work and tool material at the operating temperature amount and distribution of hard constituents in the work material degree of strain hardening in the chip none of the mentioned

amount and distribution of hard constituents in the work material

Flank wear occurs as a result of friction between progressively increasing contact area on tool flank.

Hint Answer

14. A built-up-edge is formed while machining ______

ductile materials at high speed ductile materials at low speed brittle materials at high speed brittle materials at low speed

ductile materials at low speed

When machining ductile materials, conditions of high local temperature and extreme pressure in cutting zone and also high friction in tool chip interface, may cause work material to adhere or weld to cutting edge of tool forming built-up edge. Low-cutting speed contributes to formation of built-up edge. Increasing cutting speed, increasing rake angle and using a cutting fluid contribute to reduction or elimination of built-up edge.

Hint Answer

15. The tool life is said to be over if

poor surface finish is obtained there is sudden increase in cutting forces and power consumption overheating and fuming due to heat of friction starts all of the mentioned

all of the mentioned

None

Hint Answer

16. Transducers have a much ______ natural frequency and stiffness than dynamometers.

higher lower equal none of the mentioned

higher

Transducers have a much higher natural frequency and stiffness than dynamometers, which are prone to excessive deflection and vibration.

Hint Answer

17. Crater wear is usually found while machining ductile materials.

True False

False

Crater wear is usually found while machining brittle materials.

Hint Answer

18. Tool life is generally better when

grain size of the metal is large grain size of the metal is small hard constituents are present in the micro structure of the tool material none of the mentioned

grain size of the metal is large

None

Hint Answer

19. In oblique cutting system, maximum chip thickness

occurs at the middle may not occur at the middle depends upon the material of the tool none of the mentioned

may not occur at the middle

In orthogonal cutting, maximum chip thickness occurs at middle but in oblique cutting, maximum chip thickness may not occur at middle.

Hint Answer

20. Flank wear is due to abrasive action of hard mis-constituents.

True False

True

Flank wear is due to abrasive action of hard mis-constituents including debris from built up edge as work material rubs work surface.

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

Cutting-Tool Materials and Cutting Fluids

The ductile materials, during machining, produces

Which of following parameters govern value of shear angle in continuous chip formation?

Flank wear depends upon

A built-up-edge is formed while machining ______

The tool life is said to be over if

Transducers have a much ______ natural frequency and stiffness than dynamometers.

Crater wear is usually found while machining ductile materials.

Tool life is generally better when

In oblique cutting system, maximum chip thickness

Flank wear is due to abrasive action of hard mis-constituents.

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