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4

In Oxyacetylene gas welding, temperature at the inner cone of the flame is around

A. 3500⁰C

B. 3200⁰C

C. 2900⁰C

D. 2550⁰C

Correct Answer :

B. 3200⁰C


Related Questions

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4

Segmental chips are formed during machining

A. Mild steel

B. Cast iron

C. High speed steel

D. High carbon steel

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4

The cutting fluid mostly used for machining alloy steels is

A. Water

B. Soluble oil

C. Dry

D. Sulphurised mineral oil

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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 tool life is said to be over if

A. Poor surface finish is obtained

B. There is sudden increase in cutting forces and power consumption

C. Overheating and fuming due to heat of friction starts

D. All of the above

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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

Glazing in grinding wheels takes place when the

A. Wheel is too hard or wheel revolves at a very high speed

B. Wheel is too soft or wheel revolves at a very slow speed

C. Wheel is too hard and wheel revolves at very slow speed

D. Wheel is too soft and wheel revolves at a very high speed

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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 angle between the shear plane and __________ is called shear angle.

A. Work surface

B. Tool face

C. Machine surface

D. None of these

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4

Hot rolling of mild steel is carried out

A. At recrystallization temperature

B. Between 100⁰C to 150⁰C

C. Between recrystallization temperature

D. Above recrystallization temperature

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4

Threading is an operation of

A. Smoothing and squaring the surface around a hole

B. Sizing and finishing a small diameter hole

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

D. Cutting helical grooves on the external cylindrical surface

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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

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

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

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

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

With the same tool life, the maximum material per minute is removed by

A. Increasing the cutting speed

B. Decreasing the cutting speed

C. Increasing the depth of cut

D. Increasing the feed rate

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4

When the temperature of a solid metal increases,

A. Strength of the metal decreases but ductility increases

B. Both strength and ductility of the metal decreases

C. Both strength and ductility of the metal increases

D. Strength of the metal increases but ductility decreases

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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

What is the name of the device used in arc welding circuits for the purpose of modifying the rate of current change when the weld road is varied rapidly?

A. Reactor

B. Kerf

C. Inductor

D. Cone

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4

In order to obtain a surface finish in the range of 0.75 μm to 1.25 μm , the operation used is called.

A. Grinding

B. Lapping

C. Honing

D. Buffing

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4

The taper on the lathe spindle is

A. 1 in 10

B. 1 in 15

C. 1 in 20

D. 1 in 30

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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

Green sand mould indicates that

A. Polymeric mould has been cured

B. Mould has been totally dried

C. Mould is green in colour

D. Mould contains moisture

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4

The process of removing metal by a cutter which is rotated in the same direction of travel of workpiece, is called

A. Up milling

B. Down milling

C. Face milling

D. End milling

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4

The effective number of lattice points in the unit cell of simple cubic, body centred cubic, and face centred cubic space lattices, respectively, are

A. 1, 2, 2

B. 1, 2, 4

C. 2, 3, 4

D. 2, 4, 4

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4

A better machinable metal is one which gives

A. Lower chip-tool contact area and larger shear angle

B. Higher chip-tool contact area and smaller shear angle

C. Lower chip-tool contact area and smaller shear angle

D. Higher chip-tool contact area and larger shear angle

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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

Gears can be best produced on mass production by

A. Shaping

B. Casting

C. Forming

D. Hobbing

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4

The tool life is affected by

A. Depth of cut

B. Cutting speed

C. Feed

D. All of these

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4

The vector sum of cutting velocity and chip velocity is __________ shear velocity.

A. Equal to

B. Less than

C. More than

D. None of these