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Current Affairs January 2024

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4

Lapping is an operation of

A. Making a cone-shaped enlargement of the end of a hole

B. Smoothing and squaring the surface around a hole

C. Sizing and finishing a small diameter hole

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

Correct Answer :

C. Sizing and finishing a small diameter hole


Related Questions

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4

In a plain milling machine, the table can be moved

A. Longitudinally

B. Crosswise

C. Vertically

D. All of these

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4

In drilling aluminium, 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

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4

In _________ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.

A. Up milling

B. Down milling

C. Face milling

D. End milling

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4

Chemical milling operation is performed

A. On universal milling machine

B. On plain milling machine

C. In a tank containing an etching solution

D. Any one of these

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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

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4

When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as _______ double cover butt joint.

A. Single riveted

B. Double riveted

C. Both (A) and (B)

D. None of these

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4

Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as

A. Cold shut

B. Swell

C. Sand wash

D. Scab

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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

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4

The correct sequence of tool materials in increasing order of their ability to retain their hot hardness is

A. Carbide, ceramic, cermet, borazon

B. Ceramic, carbide, borazon, cermet

C. Cermet, carbide, ceramic, borazon

D. Borazon, ceramic, carbide, cermet

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4

The cutting speed for counter-boring should be _________ that of drilling operation.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

In electro-discharge machining, dielectric is used to

A. Help in the movement of the sparks

B. Control the spark discharges

C. Act as coolant

D. All of these

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4

Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming effective resistance to be 200 μm and current flow time of 0.2 second, heat generated during the process will be

A. 0.2 Joule

B. 1 Joule

C. 5 Joule

D. 1000 Joule

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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

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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

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4

In a milling operation, two side milling cutters are mounted with a desired distance between them so that both sides of a workpiece can be milled simultaneously. This set up is called

A. Gang milling

B. Straddle milling

C. String milling

D. Side milling

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4

In a shaper, the metal is removed during

A. Forward stroke

B. Return stroke

C. Both the forward and return strokes

D. Neither the forward nor the return stroke

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4

The cutting fluid mostly used for machining steel is

A. Water

B. Soluble oil

C. Dry

D. Heavy oils

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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

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4

A set of eight form relieved milling cutters for each module is provided to enable cutting of gears of different

A. Materials

B. Types of gears

C. Number of teeth

D. Width of gears

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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

The average cutting speed for turning mild steel 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

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4

Hard and tough materials like cast iron should be turned at

A. Slow speed

B. High speed

C. Any speed

D. Certain specific speed

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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 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

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4

The purpose of jigs and fixtures is to

A. Increase machining accuracy

B. Facilitate interchangeability

C. Decrease expenditure on quality control

D. All of these

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4

Flank 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

C. Cutting edge only

D. Front face only

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4

In which of the following machine, the work remains stationary and the tool is rotated?

A. Vertical boring machine

B. Horizontal boring machine

C. Precision boring machine

D. Jig boring machine

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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 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

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4

In which type of welding a gas shield, a consumable electrode is used and the welding can be done in all positions.

A. ARC welding

B. Submerged ARC welding

C. TIG welding

D. MIG welding