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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

Correct Answer :

C. Either (A) or (B)


Related Questions

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4

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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4

In a _________, both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram.

A. Simple die

B. Progressive die

C. Combination die

D. Compound die

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4

In arc welding, the electric arc is produced between the work and the electrode by

A. Voltage

B. Flow of current

C. Contact resistance

D. All of these

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4

Thermit welding is often used in

A. Replacing broken gear teeth

B. Repairing broken shears

C. Joining rails, truck frames and locomotive frames etc.

D. All of the above

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4

In a cold 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. Low temperature and pressure is used

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4

A jolt 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 sand hardness throughout the mould

D. Produce uniform packing of sand in the mould

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4

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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4

In piercing 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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4

The chisel used for cutting key ways is

A. Flat chisel

B. Cape chisel

C. Round nose chisel

D. Diamond pointed chisel

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4

The adhesiveness is the property of sand due to which

A. It evolves a great amount of steam and other gases

B. The sand grains stick together

C. It clings to the sides of a moulding box

D. None of these

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4

The width of slot cut by a hacksaw blade is _______ the width of the blade.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

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

A. Actual deviation

B. Upper deviation

C. Lower deviation

D. Fundamental deviation

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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

Metal patterns are used for

A. Small castings

B. Large castings

C. Complicated castings

D. Large scale production of castings

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4

In a centrifugal casting method

A. Core is made of sand

B. Core is made of ferrous metal

C. Core is made of nonferrous metal

D. No core is used

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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

The current in electric resistance welding can be regulated by

A. Varying the input supply

B. Changing the primary turns of the transformer

C. Changing the secondary turns of the transformer

D. Any one of the above

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4

Notching is the operation of

A. Cutting a sheet of metal in a straight line along the length

B. Removal of metal to the desired shape from the edge of a plate

C. Cutting a sheet of metal through part of its length and then bending the cut portion

D. Bending a sheet of metal along a curved axis

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4

Which of the following statement is wrong?

A. The mortise gauge has two scribing pins

B. The gouges are chisels with a hollow shaped blade

C. An auger is a planing tool

D. All of these

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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

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

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

The temperature of the inner luminous cone of neutral flame is about

A. 1000°C

B. 1250°C

C. 2100°C

D. 3200°C

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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 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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4

The cold chisels are made from

A. Cast iron

B. Mild steel

C. High speed steel

D. Cast tool steel

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4

The purpose of a riser is to

A. Deliver 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. Deliver the molten metal from pouring basin to gate

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4

The binder commonly used in making oil sand, is

A. Clay type binder

B. Organic type binder

C. Inorganic type binder

D. Any one of these

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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

The mode of deformation of the metal during spinning is

A. Bending

B. Stretching

C. Rolling and stretching

D. Bending and stretching