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4

Most of the oxyacetylene welding is done with

A. Neutral flame

B. Oxidising flame

C. Carburising flame

D. All of these

Correct Answer :

A. Neutral flame


Related Questions

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Acetylene gas is stored in cylinders in

A. Solid form

B. Gaseous form

C. Liquid form

D. Any one of these

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According to Indian standards, the total numbers of tolerance grades are

A. 8

B. 12

C. 18

D. 20

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The sand used for making cores is

A. Green sand

B. Dry sand

C. Loam sand

D. Oil sand

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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

In a ________, two or more operations are performed simultaneously at the single stroke of the ram.

A. Simple die

B. Progressive die

C. Combination die

D. Compound die

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4

Scribing block is used to

A. Hold the round bars during marking

B. Check the trueness of flat surfaces

C. Locate the centres of round bars

D. Check the surface roughness

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For arc welding

A. Alternating current with high frequency is used

B. Alternating current with low frequency is used

C. Direct current is used

D. Any one of these

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4

The diaphragm moulding machine is used to

A. Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

B. Ram the sand harder at the back of the mould and softer on the pattern face

C. Produce uniform packing of sand in the mould

D. Give uniform sand hardness throughout the mould

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4

A rip saw

A. Is a two man saw

B. Is used for cutting along the grains of wood

C. Has a narrow blade with two wooden handles

D. All of the above

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4

Thread rolling is restricted to

A. Ferrous materials

B. Ductile materials

C. Hard materials

D. None of these

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4

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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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

The property of sand due to which the sand grains stick together is called

A. Collapsibility

B. Permeability

C. Cohesiveness

D. Adhesiveness

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4

The minimum size of a bloom is

A. 5 cm × 5 cm

B. 10 cm × 10 cm

C. 15 cm × 15 cm

D. 20 cm × 20 cm

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The metal extrusion process is generally used for producing

A. Uniform solid sections

B. Uniform hollow sections

C. Uniform solid and hollow sections

D. Varying solid and hollow sections

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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

In arc welding, the temperature of heat produced by the electric arc is of the order of

A. 3000°C to 4000°C

B. 4000°C to 5000°C

C. 5000°C to 6000°C

D. 6000°C to 7000°C

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A basic shaft is one whose

A. Lower deviation is zero

B. Upper deviation is zero

C. Lower and upper deviations are zero

D. None of these

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The operation of cutting a cylindrical hole in a sheet of metal by the punch and die is called

A. Shearing

B. Piercing

C. Punching

D. Blanking

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In blanking operation, the clearance is provided on

A. Punch

B. Die

C. Half on the punch and half on the die

D. Either on punch or die depending upon designer's choice

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The property of sand due to which it evolves a great amount of steam and other gases is called

A. Collapsibility

B. Permeability

C. Cohesiveness

D. Adhesiveness

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4

The centrifugal casting method, is used for casting articles of

A. Symmetrical shape about vertical axis

B. Symmetrical shape about horizontal axis

C. Irregular shape

D. Nonferrous metal only

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4

The cross-section of a chisel is usually

A. Rectangular

B. Square

C. Hexagonal

D. Octagonal

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In sheet metal work, he cutting force on the tool can be reduced by

A. Grinding the cutting edges sharp

B. Increasing the hardness of tool

C. Providing shear on tool

D. Increasing the hardness of die

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4

In a cold chamber die casting machine, only nonferrous alloys with _________ are casted.

A. Low melting temperature

B. High melting temperature

C. Both (A) and (B)

D. None of these

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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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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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Which of the following statement is wrong?

A. The hot chamber die casting machine is used for casting zinc, tin, lead and other low melting alloys.

B. The cold chamber die casting machine is used for casting aluminium, magnesium, copper base alloys and other high melting alloys.

C. The castings produced by centrifugal casting method have open and coarse grained structure.

D. All of the above

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4

The algebraic difference between the maximum limit and the basic size is called

A. Actual deviation

B. Upper deviation

C. Lower deviation

D. Fundamental deviation

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Loam sand is a mixture of

A. 30% sand and 70% clay

B. 50% sand and 50% clay

C. 70% sand and 30% clay

D. 90% sand and 10% clay