Home
Current Affairs January 2024

What is the correct answer?

4

Segmental chips are formed during machining

A. Mild steel

B. Cast iron

C. High speed steel

D. High carbon steel

Correct Answer :

B. Cast iron


Related Questions

What is the correct answer?

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

What is the correct answer?

4

A grinding wheel becomes glazed (i.e. cutting edge takes a glasslike appearance) due to

A. Wear of bond

B. Breaking of abrasive grains

C. Wear of abrasive grains

D. Cracks on grinding wheel

What is the correct answer?

4

The abrasive recommended for grinding materials of high tensile strength is

A. Silicon carbide

B. Aluminium oxide

C. Sand stone

D. Diamond

What is the correct answer?

4

If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is

A. 0.20

B. 0.30

C. 0.50

D. 0.60

What is the correct answer?

4

The high cutting speed and large rake angle of the tool will result in the formation of

A. Continuous chips

B. Discontinuous chip

C. Continuous chips with built up edge

D. None of these

What is the correct answer?

4

The addition of lead, sulphur and phosphorus to low carbon steels, help to

A. Reduce built up edge

B. Break up chips

C. Improve machinability

D. All of these

What is the correct answer?

4

In electrochemical machining, the gap between the tool and work is kept as

A. 0.1 mm

B. 0.4 mm

C. 0.35

D. 0.75 mm

What is the correct answer?

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

What is the correct answer?

4

The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called

A. Ceramic

B. Stellite

C. Diamond

D. Cemented carbide

What is the correct answer?

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

What is the correct answer?

4

Down milling is also called

A. Conventional milling

B. Climb milling

C. End milling

D. Face milling

What is the correct answer?

4

The usual value of the helix angle of a drill is

A. 20°

B. 30°

C. 45°

D. 60°

What is the correct answer?

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

What is the correct answer?

4

Buffing wheels are made of

A. Softer metals

B. Cotton fabric

C. Carbon

D. Graphite

What is the correct answer?

4

In down 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

What is the correct answer?

4

The enlarging of an existing circular hole with a rotating single point tool is called

A. Boring

B. Drilling

C. Reaming

D. Internal turning

What is the correct answer?

4

The cutting speed for drilling aluminium, brass and bronze 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

Glazing in grinding wheels takes place when the

A. Wheel is too hard or wheel revolves at a very high speed

B. Wheel is too soft or wheel revolves at a very slow speed

C. Wheel is too hard and wheel revolves at very slow speed

D. Wheel is too soft and wheel revolves at a very high speed

What is the correct answer?

4

In plunge 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

What is the correct answer?

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

What is the correct answer?

4

In metal cutting operations, the shear angle is the angle made by the shear plane with the

A. Direction of the tool axis

B. Direction of tool travel

C. Perpendicular to the direction of the tool axis

D. Central plane of the workpiece

What is the correct answer?

4

Any number of equal divisions can be obtained on milling machine by

A. Direct indexing

B. Simple indexing

C. Compound indexing

D. Differential indexing

What is the correct answer?

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

What is the correct answer?

4

In a plain milling cutter, the portion of the gash adjacent to the cutting edge on which the chip impinges is called

A. Face

B. Fillet

C. Land

D. Lead

What is the correct answer?

4

Slow speed of the spindle is necessary in

A. Thread cutting

B. Turning a work of larger diameter

C. Turning a hard or tough material

D. All of these

What is the correct answer?

4

The size of abrasive grain required in a grinding wheel depends upon the

A. Amount of material to be removed

B. Hardness of material being ground

C. Finish desired

D. All of these

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

The cutting angle of a flat drill varies from

A. 3° to 8°

B. 20° to 30°

C. 60° to 90°

D. 90° to 120°

What is the correct answer?

4

Ultrasonic machining is best suited for

A. Tool steels

B. Sintered carbides

C. Glass

D. All of these

What is the correct answer?

4

The snag grinding is done

A. To produce good surface finish and high degree of accuracy

B. To remove considerable amount of metal without regard to accuracy of the finished surface

C. To grind exterior cylindrical surfaces

D. Any one of the above