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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

Correct Answer :

A. Using abrasive slurry between the tool and work


Related Questions

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Chemical milling operation is performed

A. On universal milling machine

B. On plain milling machine

C. In a tank containing an etching solution

D. Any one of these

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In order to prevent tool from rubbing the work _________ on tools are provided.

A. Rake angles

B. Relief angles

C. Face angles

D. None of these

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4

A grinding wheel is said to be of _________ if it holds the abrasive grains more securely.

A. Soft grade

B. Medium grade

C. Hard grade

D. None of these

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4

The operation of making a cone-shaped enlargement of the end of a hole is known as

A. Counter-sinking

B. Counter-boring

C. Trepanning

D. Spot facing

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Which of the following statement is correct as regard to up milling?

A. It cannot be used on old machines due to backlash between the feed screw of the table and the nut.

B. The chips are disposed off easily and do not interfere with the cutting.

C. The surface milled appears to be slightly wavy.

D. The coolant can be poured directly at the cutting zone where the cutting force is maximum.

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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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The operation performed on a shaper is

A. Machining horizontal surface

B. Machining vertical surface

C. Machining angular surface

D. All of these

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Small nose radius

A. Increases tool life

B. Decreases tool life

C. Produces chipping and decreases tool life

D. Results in excessive stress concentration and greater heat generation

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4

For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of

A. 50°C

B. 100°C

C. 175°C

D. 275°C

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Ceramic tools are fixed to tool body by

A. Soldering

B. Brazing

C. Welding

D. Clamping

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Allowance in limits and fits refers to

A. Maximum clearance between shaft and hole

B. Minimum clearance between shaft and hole

C. Difference between maximum and minimum sizes of hole

D. Difference between maximum and minimum sizes of shaft

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The usual value of the point angle of a drill is

A. 70°

B. 100°

C. 118°

D. 130°

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In up-cut milling the work piece is fed

A. Against the rotating cutter

B. At angle of 60° to the cutter

C. In the direction of the cutter

D. At the right angle to the cutter

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4

The cutting speed for drilling copper with high speed steel drills varies from

A. 10 to 20 m/min

B. 18 to 30 m/min

C. 24 to 45 m/min

D. 60 to 90 m/min

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Drilling is an example of

A. Orthogonal cutting

B. Oblique cutting

C. Simple cutting

D. Uniform cutting

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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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Internal gears can be made by

A. Hobbing

B. Shaping with pinion cutter

C. Shaping with rack cutter

D. Milling

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The main purpose of a boring operation, as compared to drilling, is to

A. Drill a hole

B. Finish the drilled hole

C. Correct the hole

D. Enlarge the existing hole

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For machining a mild steel workpiece by a high speed steel tool, the average cutting speed is

A. 5 m/min

B. 10 m/min

C. 15 m/min

D. 30 m/min

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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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The process of removing metal by a cutter which is rotated in the same direction of travel of workpiece, is called

A. Up milling

B. Down milling

C. Face milling

D. End milling

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When the cutting edge of the tool is dull, then during machining

A. Continuous chips are formed

B. Discontinuous chips are formed

C. Continuous chips with built-up edge are formed

D. No chips are formed

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When the shear angle is large

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

When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as

A. Electrochemical machining

B. Electro-discharge machining

C. Ultrasonic machining

D. None of these

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4

For turning internal tapers, the suitable method is

A. By a form tool

B. By setting over the tail stock

C. By a taper turning attachment

D. By swivelling the compound rest

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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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The relation between tool life (T) and cutting speed (V) is VTn = Constant. In this relation, the value of n depends upon

A. Work material

B. Tool material

C. Working conditions

D. Type of chip produced

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Glazing in grinding wheels __________ cutting capacity.

A. Has no effect on

B. Increase

C. Decrease

D. None of these

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A feed gear box for a screw cutting lathe is designed on the basis of

A. Geometric progression

B. Arithmetic progression

C. Harmonic progression

D. None of these

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Gear burnishing is a process for

A. Surface finishing

B. Undercut gears

C. Cycloidal gears

D. Removing residual stresses from teeth roots