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Current Affairs January 2024

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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

Correct Answer :

D. All of these


Related Questions

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4

In up 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

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4

A coarse grained grinding wheel is used to grind

A. Hard and brittle materials

B. Soft and ductile materials

C. Hard and ductile materials

D. Soft and brittle materials

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4

A hole is of dimension φ = 9 ₊0⁺⁰⁰¹⁵ mm. The corresponding shaft is of dimension φ = 9 ₊0.001⁺⁰⁰¹⁰ mm. The resulting assembly has

A. Loose running fit

B. Close running fit

C. Transition fit

D. Interference fit

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4

The average cutting speed for turning brass 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

Internal gear cutting operation can be performed by

A. Milling

B. Shaping with rack cutter

C. Shaping with pinion cutter

D. Hobbing

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4

Crater wear is predominant in

A. Carbon tool steels

B. Tungsten carbide tools

C. High speed steel tools

D. Ceramic tools

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4

The hole to be drilled for tapping is _________ the outside diameter of the thread on the tap.

A. Equal to

B. Smaller than

C. Greater than

D. None of these

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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

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4

In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become

A. Half

B. Two times

C. Eight times

D. Sixteen times

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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

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4

In oblique cutting of metals, the cutting edge of the tool is

A. Perpendicular to the workpiece

B. Perpendicular to the direction of tool travel

C. Parallel to the direction of tool travel

D. Inclined at an angle less than 90° to the direction of tool travel

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4

Relief angles on high speed steel tools usually vary from

A. 0° to 3°

B. 3° to 10°

C. 10° to 20°

D. 20° to 30°

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4

When the shear angle is large

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

The material property which depends only on the basic crystal structure is

A. Fatigue strength

B. Work hardening

C. Fracture strength

D. Elastic constant

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4

The primary purpose of a sprue in a casting mould is to

A. Feed the casting at a rate consistent with the rate of solidification.

B. Act as a reservoir for molten metal

C. Feed molten metal from the pouring basin to the gate

D. Help feed the casting until all solidification takes place

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4

While current is shut down in the welding circuit, what kind of voltage exists between the output terminals of the welding machine?

A. GTAW

B. Open air cut voltage

C. Kerf

D. Gouging

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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

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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

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4

The capacity of a material to be welded under the imposed fabrication conditions into a specific, suitably designed structure and to perform satisfactorily in the intended service is known as?

A. Weldment

B. Weld tab

C. Weldability

D. Tack weld

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4

Side rake angle of a single point cutting 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 the 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 factor considered for evaluation of machinability is

A. Cutting forces and power consumption

B. Tool life

C. Type of chips and shear angle

D. All of these

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4

In order to have interference fit, it is essential that the lower limit of the shaft should be

A. Greater than the upper limit of the hole

B. Lesser than the upper limit of the hole

C. Greater than the lower limit of the hole

D. Lesser than the lower limit of the hole

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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

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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

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4

A mandrel is used to hold

A. An eccentric work

B. A heavy work

C. A thin work

D. None of these

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4

A dynamometer is a device used for the measurement of

A. Chip thickness ratio

B. Forces during metal cutting

C. Wear of the cutting tool

D. Deflection of the cutting tool

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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

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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

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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

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4

Gear finishing operation is called

A. Shaping

B. Milling

C. Hobbing

D. Burnishing