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What is the correct answer?

4

The average cutting speed for turning brass with a high speed steel tool is

A. 15 to 19 m/min

B. 25 to 31 m/min

C. 60 to 90 m/min

D. 90 to 120 m/min

Correct Answer :

C. 60 to 90 m/min


Related Questions

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4

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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4

Jigs are used

A. For holding and guiding the tool in drilling, reaming or tapping operations

B. For holding the work in milling, grinding, planing or turning operations

C. To check the accuracy of workpiece

D. None of the above

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4

A fixture is defined as a device which

A. Holds and locates a workpiece and guides and controls one or more cutting tools

B. Holds and locates a workpiece during an inspection or for a manufacturing operation

C. Is used to check the accuracy of workpiece

D. All of the above

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4

While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is

A. Independent of index change gear ratio

B. Dependent on speed change gear ratio

C. Interrelated to index change gear ratio

D. Independent of speed and index change gear ratio

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4

The maximum possible draft in cold rolling of sheet increases with the

A. Increase in coefficient of friction

B. Decrease in coefficient of friction

C. Decrease in roll radius

D. Decrease in roll velocity

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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

For generating a Coons surface we require

A. A set of grid points on the surface

B. A set of grid control points

C. Four bounding curves defining the surface

D. Two bounding curves and a set of grid control points

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4

In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is

A. Cylindrical grinder

B. Internal grinder

C. Surface grinder

D. Tool and cutter grinder

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4

The abrasive slurry used in ultrasonic machining contains fine particles of

A. Aluminium oxide

B. Boron carbide

C. Silicon carbide

D. Any one of these

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4

Which of the following statement is wrong?

A. The larger side rake angle produces chipping.

B. The smaller rake angle produces excessive wear and deformation in tool.

C. The side cutting edge angle (less than 15°) increases tool life.

D. The increase in nose radius decreases tool life.

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4

The advantage of a broaching operation is that

A. Rate of production is very high

B. High accuracy and high class of surface finish is possible

C. Roughing and finishing cuts are completed in one pass of the tool

D. All of the above

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4

Stellite preserves hardness upto a temperature of

A. 350°C

B. 500°C

C. 900°C

D. 1100°C

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4

In metal machining, the zone where the maximum heat is generated due to the plastic deformation of metal, is called

A. Friction zone

B. Work-tool contact zone

C. Shear zone

D. None of these

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4

Twist drills are made of

A. High speed steel

B. Carbon steel

C. Stainless steel

D. Either (A) or (B)

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4

Which of the following statement is correct regarding grinding of high carbon steel?

A. Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.

B. Aluminium oxide wheels are employed.

C. The grinding wheel has to be of open structure.

D. All of the above

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4

Volume of a cube of side l and volume of a sphere of radius r are equal. Both the cube and the sphere are solid and of same material. They are being cast. The ratio of the solidification time of the cube to the same of the sphere is

A. (4π/6)³ × (r/l)⁶

B. (4π/6) × (r/l)²

C. (4π/6)² × (r/l)³

D. (4π/6)² × (r/l)⁴

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4

The operation in which oil is permeated into the pores of a powder metallurgy product is known as

A. Mixing

B. Sintering

C. Impregnation

D. Infiltration

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4

A diamond locating pin is used in jigs and fixtures because

A. Diamond is very hard and wear resistant

B. It occupies very little space

C. It helps in assembly with tolerance on centre distance

D. It has a long life

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4

A bottoming tap has

A. Its end tapered for about three or four threads

B. Its end tapered for about eight or ten threads

C. Full threads for the whole of its length

D. None of the above

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4

The abrasive recommended for grinding materials of high tensile strength is

A. Silicon carbide

B. Aluminium oxide

C. Sand stone

D. Diamond

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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 velocity of tool along the tool face is known as

A. Shear velocity

B. Chip velocity

C. Cutting velocity

D. Mean velocity

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4

Broaching is applied for machining

A. Internal and external surfaces

B. Round or irregular shaped holes

C. External flat and contoured surfaces

D. All of these

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4

A drill considered as a cutting tool having zero rake, is known as a

A. Flat drill

B. Straight fluted drill

C. Parallel shank twist drill

D. Tapered shank twist drill

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4

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

The size of a shaper is given by

A. Stroke length

B. Motor power

C. Mass of machine

D. Rate size

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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

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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4

In a planer

A. Tool is stationary and work reciprocates

B. Work is stationary and tool reciprocates

C. Tool moves over stationary work

D. Tool moves over reciprocating work

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4

What is the type of joining process called, where the parts to be welded are kept in contact and rotated relative to each other and axial pressure is applied when the desired temperature is obtained?

A. Ultrasonic welding

B. Forge welding

C. Electron beam welding

D. Friction welding