Home
Current Affairs January 2024

What is the correct answer?

4

The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.

A. Mild steel

B. Copper

C. Aluminium

D. Brass

Correct Answer :

A. Mild steel


Related Questions

What is the correct answer?

4

Trepanning is performed for

A. Finishing a drilled hole

B. Producing a large hole without drilling

C. Truing a hole for alignment

D. Enlarging a drilled hole

What is the correct answer?

4

Ceramic cutting tools are

A. Made by cold pressing of aluminium oxide powder

B. Available in the form of tips

C. Brittle and have low bending strength

D. All of these

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 different spindle speeds on a lathe form

A. Arithmetical progression

B. Geometrical progression

C. Harmonical progression

D. Any one of these

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

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

What is the correct answer?

4

It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be

A. 10 r.p.m.

B. 20 r.p.m.

C. 120 r.p.m.

D. 180 r.p.m.

What is the correct answer?

4

The cutting fluid mostly used for machining steel is

A. Water

B. Soluble oil

C. Dry

D. Heavy oils

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

The floating position of the holding fixture in a rotary transfer device is used to

A. Improve the accuracy of location

B. Reduce the tendency to over-index

C. Improve upon the acceleration and deceleration characteristics

D. Reduce the cycle time

What is the correct answer?

4

The crystal structure of austenite is

A. Body centred cubic

B. Base centred cubic

C. Hexagonal closed packed

D. Body centred tetragonal

What is the correct answer?

4

In centreless grinders, the regulating wheel is inclined at

A. 0° to 8°

B. 9° to 15°

C. 16° to 20°

D. 21° to 25°

What is the correct answer?

4

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

What is the correct answer?

4

Threading is an operation of

A. Smoothing and squaring the surface around a hole

B. Sizing and finishing a small diameter hole

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

D. Cutting helical grooves on the external cylindrical surface

What is the correct answer?

4

Cold working of steel is defined as working

A. At its recrystallisation temperature

B. Above its recrystallisation temperature

C. Below its recrystallisation temperature

D. At two thirds of the melting temperature of the metal

What is the correct answer?

4

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

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

The operation performed on a shaper is

A. Machining horizontal surface

B. Machining vertical surface

C. Machining angular surface

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 actual feed in centerless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions per minute, and α = Angle of inclination of wheel)

A. πd

B. πdn

C. πdn sinα

D. πdn cosα

What is the correct answer?

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

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

Side relief angle of a single point tool is the angle

A. By which the face of the tool is inclined towards back

B. By which the face of the tool is inclined sideways

C. Between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool

D. Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base

What is the correct answer?

4

The facing is an operation of

A. Bevelling the extreme end of a workpiece

B. Embossing a diamond shaped pattern on the surface of a workpiece

C. Reducing the diameter of a workpiece over a very narrow surface

D. Machining the ends of a workpiece to produce a flat surface square with the axis

What is the correct answer?

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

What is the correct answer?

4

The tool may fail due to

A. Cracking at the cutting edge due to thermal stresses

B. Chipping of the cutting edge

C. Plastic deformation of the cutting edge

D. All of these

What is the correct answer?

4

In orthogonal turning of a low carbon steel bar of diameter 150 mm with uncoated carbide tool, the cutting velocity is 90 m/min. The feed is 0.24 mm/rev and the depth of cut is 2mm. The chip thickness obtained is 0.48 mm. If the orthogonal rake angle is zero and the principle cutting edge angle is 90⁰, the shear angle in degree is

A. 20.56

B. 26.56

C. 30.56

D. 36.56

What is the correct answer?

4

The hard grade grinding wheels are denoted by the letters

A. A to H

B. I to P

C. Q to Z

D. A to P

What is the correct answer?

4

What is the type of welding defect is caused due to stresses on heating and cooling called?

A. Incomplete penetration

B. Shrinkage void

C. Slag Entrapment (Inclusions)

D. Incomplete fusion

What is the correct answer?

4

A tool used to withdraw a drill from the sleeve is called

A. Drill remover

B. Drill puller

C. Drift

D. Drill drawer