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Current Affairs January 2024

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4

The tap used to cut threads in a blind hole is

A. Taper tap

B. Second tap

C. Bottoming tap

D. Any one of these

Correct Answer :

C. Bottoming tap


Related Questions

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4

The point angle of a drill, for drilling stainless steel, is

A. 90°

B. 118°

C. 135°

D. 150°

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4

Quality screw threads are produced by

A. Thread milling

B. Thread chasing

C. Thread cutting with single point tool

D. Thread casting

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4

Flank wear depends upon the

A. Hardness of the work and tool material at the operating temperature

B. Amount and distribution of hard constituents in the work material

C. Degree of strain hardening in the chip

D. All of these

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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

Glazing in grinding wheels __________ cutting capacity.

A. Has no effect on

B. Increase

C. Decrease

D. None of these

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4

A lead-screw with half nuts in a lathe, free to rotate in both directions has

A. V-threads

B. Whitworth threads

C. Buttress threads

D. Acme threads

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4

Internal gears can be made by

A. Hobbing

B. Shaping with pinion cutter

C. Shaping with rack cutter

D. Milling

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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

Crater wear is mainly due to the phenomenon known as

A. Adhesion of metals

B. Oxidation of metals

C. Diffusion of metals

D. All of these

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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

A type of welding flows, which is the result of a perfect proportion and mixture of acetylene and oxygen and is used for fusion welding of steel and cast iron, is

A. Carburizing flame

B. Oxidizing flame

C. Oxy-acetylene flame

D. Neutral flame

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4

For machining a mild steel workpiece by a high speed steel tool, the average cutting speed is

A. 5 m/min

B. 10 m/min

C. 15 m/min

D. 30 m/min

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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

The lip clearance angle is the angle formed by the

A. Leading edge of the land with a plane having the axis of the drill

B. Flank and a plane at right angles to the drill axis

C. Chisel edge and the lip as viewed from the end of a drill

D. None of the above

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4

The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The angle on which the strength of the tool depends is

A. Rake angle

B. Cutting angle

C. Clearance angle

D. Lip angle

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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

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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

The method of grinding used to produce a straight or tapered surface on a workpiece, is

A. Internal cylindrical grinding

B. Form grinding

C. External cylindrical grinding

D. Surface grinding

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4

It is desired to perform the operations like drilling, reaming, counter-boring etc. on a work piece. Which of the following machine will be used?

A. Sensitive drilling machine

B. Radial drilling machine

C. Gang drilling machine

D. Multiple spindle drilling machine

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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

Down milling is also called

A. Conventional milling

B. Climb milling

C. End milling

D. Face milling

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4

Continuous chips with built up edge are formed during machining of

A. Brittle metals

B. Ductile metals

C. Hard metals

D. Soft metals

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4

A taper tap has

A. Its end tapered for about three or four threads

B. Its end tapered for about eight or ten threads

C. Full threads for the whole of its length

D. None of the above

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4

The specific cutting energy used for establishing the machinability of the metal depends upon its

A. Coefficient of friction

B. Microstructure

C. Work hardening characteristics

D. All of these

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4

The depth of cut in drilling is __________ the drill diameter.

A. Equal to

B. One-fourth

C. One-half

D. Double

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4

Carbide tipped tools usually have

A. Negative rake angle

B. Positive rake angle

C. Any rake angle

D. No rake angle

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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

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

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4

For harder alloy steel, the point angle of the drill is kept

A. Equal to 118°

B. Less than 118°

C. More than 118°

D. Any one of these