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4

The process extensively used for making bolts and nuts is

A. Hot piercing

B. Extrusion

C. Cold peening

D. Cold heading

Correct Answer :

D. Cold heading


Related Questions

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In order to get uniform thickness of the plate by rolling process, one provides

A. Camber on the rolls

B. Offset on the rolls

C. Hardening of the rolls

D. Antifriction bearings

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A file with 20 teeth in 25 mm is called

A. Rough file

B. Bastard file

C. Second cut file

D. Smooth file

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During cold working process

A. Grain structure is distorted

B. Strength and hardness of metal increases

C. Close dimensional tolerance can be maintained

D. All of the above

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4

The dowels are

A. Wooden nails

B. Box nails

C. Wire nails

D. None of these

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The accuracy of micrometers, calipers, dial indicators can be checked by a

A. Feeler gauge

B. Slip gauge

C. Ring gauge

D. Plug gauge

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In shielded arc welding

A. Large electrode is used

B. Welding rod coated with slag is used

C. Welding rod coated with fluxing material is used

D. None of the above

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A sand employed on the faces of the pattern before moulding, is called

A. Green sand

B. Dry sand

C. Loam sand

D. Parting sand

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Riddle is used for

A. Smoothing and cleaning out depressions in the mould

B. Cleaning the moulding sand

C. Moistening the sand around the edge before removing pattern

D. Reinforcement of sand in the top part of moulding box

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4

In a gas welding of mild steel using an oxyacetylene flame, the total amount of acetylene consumed is 10 litres. The oxygen consumption from the cylinder is

A. 5 litres

B. 10 litres

C. 15 litres

D. 20 litres

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The metal is subjected to mechanical working for

A. Refining grain size

B. Reducing original block into desired shape

C. Controlling the direction of flow lines

D. All of these

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

A. Same as

B. Less than

C. More than

D. None of these

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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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Cold working of metal increases

A. Tensile strength

B. Yield strength

C. Hardness

D. All of these

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The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as

A. Hot piercing

B. Extrusion

C. Cold peening

D. Cold heading

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4

In order to deliver molten metal from pouring basin to gate, a ________ is used.

A. Riser

B. Sprue

C. Core

D. None of these

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The acetylene cylinder is usually painted with

A. Black colour

B. White colour

C. Maroon colour

D. Yellow colour

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Cutting and forming operations can be performed in a single operation in a

A. Simple die

B. Progressive die

C. Compound die

D. Combination die

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For smoothing and cleaning out depressions in the mould, a __________ is used.

A. Slick

B. Lifter

C. Swab

D. Gagger

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In die casting, machining allowance is

A. Small

B. Large

C. Very large

D. Not provided

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In order to check the clearance between two mating surfaces, a ________ gauge should be used.

A. Ring

B. Plug

C. Feeler

D. None of these

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In average work, the tolerance produced by investment casting method is

A. ±0.05 mm

B. +0.2 mm

C. +05 mm

D. +1 mm

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Extrusion

A. Is extensively used for making bolts and nuts

B. Is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work

C. Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface

D. Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part

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The increase in hardness due to cold working, is called

A. Age hardening

B. Work hardening

C. Induction hardening

D. Flame hardening

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4

To prevent the body of the blade from jamming in the saw cut, the teeth of blade are

A. Strengthened

B. Sharpened

C. Set

D. All of these

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Most of the oxyacetylene welding is done with

A. Neutral flame

B. Oxidising flame

C. Carburising flame

D. All of these

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A casting defect which occurs due to improper venting of sand is known as

A. Cold shuts

B. Blow holes

C. Shift

D. Swell

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

A. Same

B. Less

C. More

D. None of these

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A zinc diffusion process is called

A. Galvanising

B. Anodising

C. Parkerising

D. Sherardizing

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A file removes the metal during

A. Forward stroke

B. Return stroke

C. Both forward and return strokes

D. None of these

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Piercing is an operation of cutting

A. A cylindrical hole in a sheet of metal by the punch and the die

B. A hole (other than cylindrical) in a sheet of metal by the punch and the die

C. A flat sheet to the desired shape

D. A number of holes evenly spaced in a regular pattern on a sheet of metal