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Current Affairs January 2024

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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

Correct Answer :

D. All of the above


Related Questions

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4

Allowance in limits and fits refers to

A. Maximum clearance between shaft and hole

B. Minimum clearance between shaft and hole

C. Difference between maximum and minimum sizes of hole

D. Difference between maximum and minimum sizes of shaft

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4

The work or surface speed for cylindrical grinding varies from

A. 5 to 10 m/min

B. 10 to 20 m/min

C. 20 to 30 m/min

D. 40 to 60 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

The type of tool used on milling machine and broaching machine is

A. Single point cutting tool

B. Two point cutting tool

C. Three point cutting tool

D. Multipoint cutting tool

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4

The method of centre less grinding used to produce taper is

A. In-feed grinding

B. Through feed grinding

C. End feed grinding

D. Any one 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

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

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4

A push broach as compared to pull broach

A. Has less number of teeth

B. Is short and stocky

C. Removes less material for each pass of the tool

D. All of the above

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4

The process of changing the shape of grinding wheel as it becomes worn due to breaking away of the abrasive and bond, is called

A. Truing

B. Dressing

C. Facing

D. Clearing

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4

In a planer

A. Tool is stationary and work reciprocates

B. Work is stationary and tool reciprocates

C. Tool moves over stationary work

D. Tool moves over reciprocating work

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4

In machining metal, cutting force at the cutting edge is measured by a

A. Wattmeter

B. Dynamometer

C. Hydrometer

D. Pyrometer

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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

Crack in grinding wheel is developed due to

A. High temperature developed at the contact of the wheel face and work

B. Grinding hard work

C. Low speed of wheel

D. High speed of wheel

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4

Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles on and 2 cycles off Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.

A. 2.17 rpm, 600 joules

B. 6.8 rpm, 6 joules

C. 5.03 rpm, 600 joules

D. 22 rpm, 600 joules

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4

In a gating system, the ratio 1: 2: 4 represents

A. Sprue base area: runner area: ingate area

B. Pouring basin area: ingate area: runner area

C. Sprue base area: ingate area: casting area

D. Runner area: ingate area: casting area

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4

Which one of the following is a solid state joining process?

A. Gas tungsten arc welding

B. Resistance spot welding

C. Friction welding

D. Submerged arc welding

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4

Which of the following statement is wrong as regard to down milling?

A. It can not be used on old machines due to backlash between the feed screw of the table and the nut.

B. The chips are disposed off easily and do not interfere with the cutting.

C. The surface milled appears to be slightly wavy.

D. The coolant can be poured directly at the cutting zone where the cutting force is maximum.

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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

In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate

A. Increases continuously

B. Decreases continuously

C. Decreases, becomes stable and then increases.

D. Increases, becomes stable and then decreases.

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4

In hot machining, the work is heated by

A. Simple heating

B. Flame heating

C. Induction heating

D. Any one of these

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4

Which of the following statement is wrong?

A. The larger side rake angle produces chipping.

B. The smaller rake angle produces excessive wear and deformation in tool.

C. The side cutting edge angle (less than 15°) increases tool life.

D. The increase in nose radius decreases tool life.

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4

The method of grinding used to produce internal cylindrical holes and tapers, is

A. Internal cylindrical grinding

B. Form grinding

C. External cylindrical grinding

D. Surface grinding

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4

The tool material, for faster machining, should have

A. Wear resistance

B. Red hardness

C. Toughness

D. All of these

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4

A __________ grinding wheel is used to grind soft materials.

A. Course grained

B. Medium grained

C. Fine grained

D. None of these

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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

A twist drill is specified by its

A. Shank, material and diameter

B. Shank, lip angle and size of flute

C. Material, length of body and helix angle

D. Any one of these

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4

The example of snag grinding is

A. Trimming the surface left by sprues and risers on castings

B. Grinding the parting line left on castings

C. Removing flash on forgings

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

Misrun is a casting defect which occurs due to

A. Very high pouring temperature of the metal

B. Insufficient fluidity of the molten metal

C. Absorption of gases by the liquid metal

D. Improper alignment of the mould flasks

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4

The machining of titanium is difficult due to

A. High thermal conductivity of titanium

B. Chemical reaction between tool and work

C. Low tool-chip contact area

D. None of these