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Current Affairs January 2024

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4

Gear lapping is an operation

A. After heat treatment

B. Prior to heat treatment

C. For gear reconditioning

D. None of these

Correct Answer :

A. After heat treatment


Related Questions

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4

In determining the various forces on the chip, Merchant assumed that the

A. Cutting edge of the tool is sharp and it does not make any flank contact with the workpiece

B. Only continuous chip without built-up-edge is produced

C. Cutting velocity remains constant

D. All of the above

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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

The in-feed grinding is used to

A. Produce tapers

B. Grind shoulders and formed surfaces

C. Grind long, slender shafts or bars

D. All of these

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4

The angle between the lathe centres is

A. 30°

B. 45°

C. 60°

D. 90°

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4

A broach has

A. Roughing teeth

B. Semi-finishing teeth

C. Finishing teeth

D. All of these

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4

The aluminium oxide abrasive is chiefly used for grinding

A. High speed steel

B. Carbon steel

C. Wrought iron

D. All of these

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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

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4

In a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is known as

A. Side relief angle

B. End relief angle

C. Back rake angle

D. Side rake angle

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4

Which of the following statement is correct about nose radius?

A. It improves tool life

B. It improves the surface finish

C. Both (A) and (B)

D. None of these

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4

Which one among the following welding processes uses nonconsumable electrode?

A. Gas metal arc welding

B. Submerged arc welding

C. Gas tungsten arc welding

D. Flux coated arc welding

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4

Which of the following operations is carried out at a minimum cutting velocity if the machines are equally rigid and the tool work materials are the same?

A. Turning

B. Grinding

C. Boring

D. Milling

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4

The saw milling is an operation of

A. Producing grooves around the periphery of a cylindrical or conical workpiece

B. Producing narrow slots or grooves on a workpiece

C. Reproduction of an outline of a template on a workpiece

D. Machining several surfaces of a workpiece simultaneously

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4

The usual value of the helix angle of a drill is

A. 20°

B. 30°

C. 45°

D. 60°

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4

The grinding operation is a

A. Shaping operation

B. Forming operation

C. Surface finishing operation

D. Dressing operation

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4

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

If the cutting speed is increased, then the built-up-edge

A. Becomes longer

B. May or may not form

C. Becomes smaller and finally does not form at all

D. Has nothing to do with speed

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4

In drilling Bakelite and fibrous plastics, the point angle of a drill is

A. 90°

B. 118°

C. 135°

D. 150°

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4

The binding material used in cemented carbide tools is

A. Tungsten

B. Chromium

C. Silicon

D. Cobalt

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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

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4

The usual value of the point angle of a drill is

A. 70°

B. 100°

C. 118°

D. 130°

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4

As the cutting speed increases, the tool cutting forces

A. Remain constant

B. Increases

C. Decreases

D. First increases and then decreases

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4

The broaching operation in which either the work or the tool moves across the other, is known as

A. Pull broaching

B. Push broaching

C. Surface broaching

D. Continuous broaching

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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

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

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4

Tumbler gears in lathe are used to

A. Reduce the spindle speed

B. Cut gears

C. Give desired direction of movement to the lathe carriage

D. Drill a workpiece

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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

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4

Thread grinding requires work speed from

A. 1 to 3 m/min

B. 5 to 10 m/min

C. 10 to 14 m/min

D. 14 to 20 m/min

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4

When the shear angle is small

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

Shrinkage allowance on pattern is provided to compensate for shrinkage when

A. The temperature of liquid metal drops from pouring to freezing temperature

B. The metal changes from liquid to solid state at freezing temperature

C. The temperature of solid phase drops from freezing to room temperature

D. The temperature of metal drops from pouring to room temperature

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4

The type of reamer used for reaming soft aluminium or copper, is

A. Straight fluted reamer

B. Left hand spiral fluted reamer

C. Right hand spiral fluted reamer

D. Any one of these