Home
Current Affairs January 2024

What is the correct answer?

4

In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called

A. Friction zone

B. Work-tool contact zone

C. Shear zone

D. None of these

Correct Answer :

A. Friction zone


Related Questions

What is the correct answer?

4

In machining metals, surface roughness is due to

A. Feed marks or ridges left by the cutting tool

B. Fragment of built-up edge on the machined surface

C. Cutting tool vibrations

D. All of these

What is the correct answer?

4

The main purpose of spheroidising treatment is to improve

A. Hardenability of low carbon steels

B. Machinability of low carbon steels

C. Hardenability of high carbon steels

D. Machinability of high carbon steels

What is the correct answer?

4

In the relation VTn = C, the value of n for carbide 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

What is the correct answer?

4

The angle on which the strength of the tool depends is

A. Rake angle

B. Cutting angle

C. Clearance angle

D. Lip angle

What is the correct answer?

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.

What is the correct answer?

4

Crater wear is predominant in

A. Carbon tool steels

B. Tungsten carbide tools

C. High speed steel tools

D. Ceramic tools

What is the correct answer?

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

What is the correct answer?

4

Drilling is an example of

A. Orthogonal cutting

B. Oblique cutting

C. Simple cutting

D. Uniform cutting

What is the correct answer?

4

In drilling brass, a drill with

A. Zero helix angle is used

B. Low helix angle is used

C. High helix angle is used

D. Any helix angle can be used

What is the correct answer?

4

The operation of smoothing and squaring the surface around a hole is known as

A. Counter-sinking

B. Counter-boring

C. Trepanning

D. Spot facing

What is the correct answer?

4

An operation of embossing a diamond shaped pattern on the surface of a workpiece, is known as

A. Counter-boring

B. Grooving

C. Knurling

D. Facing

What is the correct answer?

4

What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?

A. Porosity

B. Undercut

C. Under fill

D. Crack

What is the correct answer?

4

The object of caulking in a riveted joint is to make the joint

A. Free from corrosion

B. Stronger in tension

C. Free from stresses

D. Leak-proof

What is the correct answer?

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

What is the correct answer?

4

A grinding wheel is said to be of _________ if the abrasive grains can be easily dislodged.

A. Soft grade

B. Medium grade

C. Hard grade

D. None of these

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

The tool material, for faster machining, should have

A. Wear resistance

B. Red hardness

C. Toughness

D. All of these

What is the correct answer?

4

In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate

A. Increases continuously

B. Decreases continuously

C. Decreases, becomes stable and then increases.

D. Increases, becomes stable and then decreases.

What is the correct answer?

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

What is the correct answer?

4

The velocity of tool along the tool face is known as

A. Shear velocity

B. Chip velocity

C. Cutting velocity

D. Mean velocity

What is the correct answer?

4

A 15 mm drilling machine means that it can drill a hole

A. Of maximum diameter 15 mm

B. In 15 mm thick plates

C. Having cross-sectional area of 15 mm²

D. None of these

What is the correct answer?

4

The factor responsible for the formation of discontinuous chips is

A. Low cutting speed and large rake angle

B. Low cutting speed and small rake angle

C. High cutting speed and large rake angle

D. High cutting speed and small rake angle

What is the correct answer?

4

Crater wear occurs mainly on the

A. Nose part, front relief face and side relief face of the cutting tool

B. Face of the cutting tool at a short distance from the cutting edge only

C. Cutting edge only

D. Front face only

What is the correct answer?

4

A jig 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

What is the correct answer?

4

Low helix angle drills are preferred for drilling holes in

A. Plastics

B. Copper

C. Cast steel

D. Carbon steel

What is the correct answer?

4

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

What is the correct answer?

4

The lip angle is the angle

A. Between the tool face and the ground end surface of flank

B. Made by the face of the tool and the plane parallel to the base of the cutting tool

C. Between the face of the tool and a line tangent to the machined surface at the cutting point

D. None of the above

What is the correct answer?

4

The aluminium oxide abrasive is chiefly used for grinding

A. High speed steel

B. Carbon steel

C. Wrought iron

D. All of these

What is the correct answer?

4

In transverse grinding

A. The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face

B. The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face

C. The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face

D. The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face