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4

The temperature of oxy-hydrogen flame is _________ oxyacetylene flame.

A. Same as

B. Less than

C. More than

D. None of these

Correct Answer :

B. Less than


Related Questions

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4

In a hot chamber die casting machine

A. Melting pot is separate from the machine

B. Melting pot is an integral part of the machine

C. Melting pot may have any location

D. High temperature and pressure is used

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4

In backhand welding, the angle between the welding rod and the work is ________ as compared to forehand welding.

A. Same

B. Less

C. More

D. None of these

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4

Sand wash is a casting defect which

A. Results in a mismatching of the top and bottom parts of a casting

B. Results in general enlargement of the casting

C. Occurs near the ingates as rough lumps on the surface of a casting

D. Occurs as sand patches on the upper surface of a casting

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4

An oxidising process used for aluminium and magnesium articles is called

A. Galvanising

B. Anodising

C. Parkerising

D. Sherardizing

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4

Galvanising is a

A. Zinc diffusion process

B. Process of coating zinc by hot dipping

C. Process used for making thin phosphate coating on steel

D. None of the above

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4

The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is

A. Less than 0.1 percent

B. Less than 0.3 percent

C. More than 0.3 percent

D. Anywhere between 0.1 to 1 percent

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4

A neutral flame is obtained by supplying

A. Equal volumes of oxygen and acetylene

B. More volume of oxygen and less volume of acetylene

C. More volume of acetylene and less volume of oxygen

D. None of the above

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4

During hot working of metals

A. Porosity of the metal is largely eliminated

B. Grain structure of the metal is refined

C. Mechanical properties are improved due to refinement of grains

D. All of the above

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4

Aluminium is the best material for making patterns because it is

A. Light in weight

B. Easy to work

C. Corrosion resistant

D. All of these

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4

4.Linde welding uses

A. Neutral flame and rightward technique

B. Oxidising flame and leftward technique

C. Neutral flame and leftward technique

D. Carburising flame and rightward technique

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4

V-block is used to

A. Check the trueness of flat surfaces

B. Locate centres of round rods

C. Check the surface roughness

D. None of these

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4

A casting defect which results in general enlargement of a casting is known as

A. Shift

B. Sand wash

C. Swell

D. Scab

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4

The operation of cutting of a flat sheet to the desired shape is called

A. Shearing

B. Piercing

C. Punching

D. Blanking

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The purpose of a gate is to

A. Delivers molten metal into the mould cavity

B. Act as a reservoir for the molten metal

C. Feed the molten metal to the casting in order to compensate for the shrinkage

D. Delivers molten metal from pouring basin to gate

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4

Carburising flame is used to weld

A. Steel, cast iron, copper, aluminium etc

B. Brass and bronze

C. Hard surfacing materials such as stellite

D. All of these

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4

Lap joints are employed on plates having thickness

A. Less than 3 mm

B. 5 to 10 mm

C. 12.5 mm

D. Above 25 mm

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4

The electrode tip diameter (d) in spot welding should be equal to (where t = Thickness of plate to be welded)

A. t

B. 1.5 t

C. 3 t

D. 6 t

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4

When a hole or cavity to be cored is not in line with the parting surface, then a ________ is used.

A. Horizontal core

B. Vertical core

C. Drop core

D. Balanced core

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4

The operation of producing cup shaped parts from flat sheet metal blanks by bending and plastic flow of metal, is known as

A. Drawing

B. Squeezing

C. Coining

D. Planishing

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4

In TIG arc welding, the welding zone is shielded by an atmosphere of

A. Helium gas

B. Argon gas

C. Either (A) or (B)

D. None of these

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4

In a hot chamber die casting machine

A. Ferrous alloys with low melting temperature are casted

B. Ferrous alloys with high melting temperature are casted

C. Nonferrous alloys with low melting temperature are casted

D. Nonferrous alloys with high melting temperature are casted

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4

Blanking and piercing operations can be performed simultaneously in a

A. Simple die

B. Progressive die

C. Compound die

D. Combination die

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4

The temperature produced by oxy-hydrogen flame is about

A. 1800°C

B. 2100°C

C. 2400°C

D. 3200°C

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4

In order to produce uniform packing of sand in the moulds, a __________ is used.

A. Sand slinger

B. Squeezing machine

C. Jolt machine

D. Stripper plate machine

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4

The mode of deformation of the metal during spinning is

A. Bending

B. Stretching

C. Rolling and stretching

D. Bending and stretching

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4

For gas welding, the pressure desired at the welding torch for acetylene is

A. 7 to 103 kN/m²

B. 70 to 280 kN/m²

C. 280 to 560 kN/m²

D. 560 to 840 kN/m²

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4

In welding copper alloys with TIG arc welding

A. Direct current with straight polarity is used

B. Direct current with reversed polarity is used

C. Alternating current is used

D. Any one of these

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4

The material which can be best cut with oxygen cutting process is

A. Mild steel

B. Brass

C. Copper

D. Aluminium

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4

A hacksaw blade is specified by its

A. Length

B. Material

C. Width

D. Number of teeth

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4

The surface to be left unmachined is marked on the pattern by

A. Red colour

B. Yellow colour

C. Black colour

D. Blue colour