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Current Affairs January 2024

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4

In the relation VTn = C, the value of n for ceramic tools is

A. 0.1 to 0.2

B. 0.20 to 0.25

C. 0.25 to 0.40

D. 0.40 to 0.55

Correct Answer :

D. 0.40 to 0.55


Related Questions

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4

Lapping is an operation of

A. Making a cone-shaped enlargement of the end of a hole

B. Smoothing and squaring the surface around a hole

C. Sizing and finishing a small diameter hole

D. Producing a hole by removing metal along the circumference of a hollow cutting tool

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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

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4

The machining of titanium is difficult due to

A. High thermal conductivity of titanium

B. Chemical reaction between tool and work

C. Low tool-chip contact area

D. None of these

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4

Which of the following statement is correct for orthogonal cutting system?

A. The cutting edge of the tool is perpendicular to the direction of tool travel.

B. The cutting edge clears the width of the workpiece on either ends.

C. The chip flows over the tool face and the direction of the chip flow velocity is normal to the cutting edge.

D. All of the above

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4

Tool life is measured by the

A. Number of pieces machined between tool sharpenings

B. Time the tool is in contact with the job

C. Volume of material removed between tool sharpenings

D. All of the above

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4

The angle between the shear plane and __________ is called shear angle.

A. Work surface

B. Tool face

C. Machine surface

D. None of these

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4

Internal or external threads of different pitches can be produced by

A. Pantograph milling machine

B. Profiling machine

C. Planetary milling machine

D. Piano miller

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4

What is the method of brazing used to join relatively small assemblies made from materials that either do not oxidize at the brazing temperature or can be protected from oxidation with a flux?

A. Torch brazing

B. Dip brazing

C. Resistance brazing

D. Furnace brazing

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4

In ECM, the material removal is due to

A. Corrosion

B. Erosion

C. Fusion

D. Ion displacement

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4

The cutting speed is maximum while machining __________ with a high speed steel tool.

A. Cast iron

B. Mild steel

C. Brass

D. Aluminium

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4

If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is

A. Conical locator

B. Cylindrical locator

C. Diamond pin locator

D. Vee locator

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4

In metal machining, the work-tool contact zone is a zone where heat is generated due to

A. Plastic deformation of metal

B. Burnishing friction

C. Friction between the moving chip and the tool face

D. None of the above

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4

The chamfering is an essential operation after

A. Knurling

B. Rough turning

C. Boring

D. Thread cutting

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4

Lathe bed is made of

A. Mild steel

B. Alloy steel

C. Pig iron

D. Chilled cast iron

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4

The lip angle of a single point tool is usually

A. 20° to 40°

B. 40° to 60°

C. 60° to 80°

D. None of these

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4

The hardness of a grinding wheel is determined by the

A. Hardness of abrasive grains

B. Ability of the bond to retain abrasives

C. Hardness of the bond

D. Ability of the grinding wheel to penetrate the work piece

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4

When the shear angle is small

A. Path of shear is short and chip is thin

B. Path of shear is large and chip is thick

C. Path of shear is short and chip is thick

D. Path of shear is large and chip is thin

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4

The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is

A. 1.02

B. 1.32

C. 1.66

D. 1.82

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4

In ultrasonic machining, tool is made of

A. Tungsten carbide

B. Brass or copper

C. Diamond

D. Stainless steel

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4

In oblique cutting system, the cutting edge of the tool

A. May clear the width of the workpiece

B. May or may not clear the width of the workpiece

C. May not clear the width of the workpiece

D. Should always clear the width of the workpiece

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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

When the end of a tap is tapered for about three or four threads, it is known as a

A. Taper tap

B. Bottoming tap

C. Second tap

D. None of these

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4

In electro discharge machining, tool is made of

A. Brass

B. Copper

C. Copper tungsten alloy

D. All of these

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4

The binding material used in cemented carbide tools is

A. Tungsten

B. Chromium

C. Silicon

D. Cobalt

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4

The capacity of a material to be welded under the imposed fabrication conditions into a specific, suitably designed structure and to perform satisfactorily in the intended service is known as?

A. Weldment

B. Weld tab

C. Weldability

D. Tack weld

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4

The rake angle of a single point cutting tool corresponds to _________ of a twist drill.

A. Lip clearance angle

B. Helix angle

C. Point angle

D. Chisel edge angle

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4

Relief angles on high speed steel tools usually vary from

A. 0° to 3°

B. 3° to 10°

C. 10° to 20°

D. 20° to 30°

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4

The type of reamer used for reaming operation in a blind hole, is

A. Straight fluted reamer

B. Left hand spiral fluted reamer

C. Right hand spiral fluted reamer

D. Any one of these

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4

In ultrasonic machining, the metal is removed by

A. Using abrasive slurry between the tool and work

B. Direct contact of tool with the work

C. Maintaining an electrolyte between the work and tool in a very small gap between the two

D. Erosion caused by rapidly recurring spark discharges between the tool and work

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4

In hot machining, tool is made of

A. Tungsten carbide

B. Brass or copper

C. Diamond

D. Stainless steel