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4

Friction at the tool-chip interface can be reduced by

A. Decreasing the rake angle

B. Increasing the depth of cut

C. Decreasing the cutting speed

D. Increasing the cutting speed

Correct Answer :

D. Increasing the cutting speed


Related Questions

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4

An expendable pattern is used in

A. Slush casting

B. Squeeze casting

C. Centrifugal casting

D. Investment casting

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4

Crater wear leads to

A. Increase in cutting temperature

B. Weakening of tool

C. Friction and cutting forces

D. All of these

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4

A solid cylinder of diameter 100 mm and height 50 mm is forged between two frictionless flat dies to a height of 25mm. The percentage change in diameter is

A. 0

B. 2.07

C. 20.7

D. 41.4

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4

When 3-2-1 principle is used to support and locate a three dimensional work-piece during machining, the number of degrees of freedom that are restricted is

A. 7

B. 8

C. 9

D. 10

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4

What is the name of the device used in arc welding circuits for the purpose of modifying the rate of current change when the weld road is varied rapidly?

A. Reactor

B. Kerf

C. Inductor

D. Cone

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4

The grinding wheel speed (surface speed in m/min) usually varies from

A. 500 to 1000

B. 1000 to 1500

C. 1500 to 2000

D. 2000 to 2500

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4

The tool may fail due to

A. Cracking at the cutting edge due to thermal stresses

B. Chipping of the cutting edge

C. Plastic deformation of the cutting edge

D. All of these

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4

The silicon carbide abrasive is chiefly used for grinding

A. Cemented carbide

B. Ceramic

C. Cast iron

D. All of these

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4

Tool life is generally better when

A. Grain size of the metal is large

B. Grain size of the metal is small

C. Hard constituents are present in the microstructure of the tool material

D. None of the above

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4

What is the type of welding defect is caused due to stresses on heating and cooling called?

A. Incomplete penetration

B. Shrinkage void

C. Slag Entrapment (Inclusions)

D. Incomplete fusion

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4

Hardness of green sand mould increases with

A. Increase in moisture content beyond 6 percent

B. Increase in permeability

C. Decrease in permeability

D. Increase in both moisture content and permeability

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4

Green sand mould indicates that

A. Polymeric mould has been cured

B. Mould has been totally dried

C. Mould is green in colour

D. Mould contains moisture

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4

The depth of cut in drilling is __________ the drill diameter.

A. Equal to

B. One-fourth

C. One-half

D. Double

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4

In a shaper, the metal is removed during

A. Forward stroke

B. Return stroke

C. Both the forward and return strokes

D. Neither the forward nor the return stroke

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4

The aluminium oxide abrasive is chiefly used for grinding

A. High speed steel

B. Carbon steel

C. Wrought iron

D. All of these

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4

The saw milling is an operation of

A. Producing grooves around the periphery of a cylindrical or conical workpiece

B. Producing narrow slots or grooves on a workpiece

C. Reproduction of an outline of a template on a workpiece

D. Machining several surfaces of a workpiece simultaneously

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4

In centreless grinders, the regulating wheel is inclined at

A. 0° to 8°

B. 9° to 15°

C. 16° to 20°

D. 21° to 25°

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4

Low helix angle drills are preferred for drilling holes in

A. Plastics

B. Copper

C. Cast steel

D. Carbon steel

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4

Which of the following is the correct data structure for solid models?

A. Solid part - faces - edges - vertices

B. Solid part - edges - faces - vertices

C. Vertices - edges - faces - solid parts

D. Vertices - faces- edges - solid parts

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4

Misrun is a casting defect which occurs due to

A. Very high pouring temperature of the metal

B. Insufficient fluidity of the molten metal

C. Absorption of gases by the liquid metal

D. Improper alignment of the mould flasks

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4

What is the type of welding defect caused due to poor deposition of weld rod is called?

A. Porosity

B. Undercut

C. Under fill

D. Crack

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4

Hard and tough materials like cast iron should be turned at

A. Slow speed

B. High speed

C. Any speed

D. Certain specific speed

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4

In order to obtain a surface finish in the range of 0.75 μm to 1.25 μm , the operation used is called.

A. Grinding

B. Lapping

C. Honing

D. Buffing

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4

In up milling, the thickness of chip is

A. Minimum at the beginning of the cut and maximum at the end of the cut

B. Maximum at the beginning of the cut and minimum at the end of the cut

C. Uniform throughout the cut

D. None of these

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4

The increase in depth of cut and feed rate __________ surface finish.

A. Improves

B. Deteriorates

C. Does not effect

D. None of these

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4

The lip clearance angle is the angle formed by the

A. Leading edge of the land with a plane having the axis of the drill

B. Flank and a plane at right angles to the drill axis

C. Chisel edge and the lip as viewed from the end of a drill

D. None of the above

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4

The angle made by the face of the tool and the plane parallel to the base of cutting tool is called

A. Rake angle

B. Cutting angle

C. Clearance angle

D. Lip angle

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4

The operation of machining several surfaces of a workpiece simultaneously is called

A. Profile milling

B. Gang milling

C. Saw milling

D. Helical milling

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4

The chuck preferred for quick setting and accurate centering of a job is

A. Four jaw independent chuck

B. Collect chuck

C. Three jaw universal chuck

D. Magnetic chuck

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4

In which of the following machine, the work is usually rotated while the drill is fed into work?

A. Sensitive drilling machine

B. Radial drilling machine

C. Gang drilling machine

D. Deep hole drilling machine