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4

In welding magnesium with TIG arc welding, direct current with _________ is used.

A. Straight polarity

B. Reversed polarity

C. Both (A) and (B)

D. None of these

Correct Answer :

B. Reversed polarity


Related Questions

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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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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 oxyacetylene gas used in gas welding produce a flame temperature of

A. 1800°C

B. 2100°C

C. 2400°C

D. 3200°C

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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

The acetylene cylinder is usually painted with

A. Black colour

B. White colour

C. Maroon colour

D. Yellow colour

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When more volume of acetylene and less volume of oxygen is supplied, then a ________ flame is obtained.

A. Neutral

B. Oxidising

C. Carburising

D. None of these

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4

The blank diameter used in thread rolling will be

A. Equal to minor diameter of the thread

B. Equal to pitch diameter of the thread

C. A little larger than the minor diameter of the thread

D. A little larger than the pitch diameter of the thread

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4

In a four high rolling mill, there are four rolls out of which

A. One is working roll and three are backing up rolls

B. Two are working rolls and two are backing up rolls

C. Three are working rolls and one is backing up roll

D. All of the four are working rolls

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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

Neutral flame is used to weld

A. Steel

B. Cast iron

C. Copper

D. All of these

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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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4

When the file is moved to and fro over the work, it is known as

A. Cross filing

B. Draw filing

C. Pull and push filing

D. None of these

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4

In forehand welding, the weld is made

A. From left to right

B. From right to left

C. First from left to right and then from right to left

D. Either from left to right or from right to left

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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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The operation of straightening a curved sheet metal, is known as

A. Drawing

B. Squeezing

C. Coining

D. Planishing

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4

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

A. Red colour

B. Yellow colour

C. Black colour

D. Blue colour

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A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as

A. Shift

B. Sand wash

C. Swell

D. Scab

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4

In backhand welding, the angle between the welding torch and the work is kept as

A. 30°-40°

B. 40°-50°

C. 50°-60°

D. 60°-70°

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4

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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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

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

In a simple die

A. Two or more operations are performed simultaneously at the single stroke of the ram

B. Two or more cutting operations are performed at one station of the press in every stroke of the ram

C. Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram

D. None of the above

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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

The process extensively used for making bolts and nuts is

A. Hot piercing

B. Extrusion

C. Cold peening

D. Cold heading

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4

A hacksaw blade cuts on the

A. Forward stroke

B. Return stroke

C. Both forward and return strokes

D. Cutting depends upon the direction of force

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4

Cold working of metal increases

A. Tensile strength

B. Yield strength

C. Hardness

D. All of these

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4

The teeth of hacksaw blade are bent

A. Towards right

B. Towards left

C. Alternately towards right and left and every third or fourth left straight

D. May be bent in any direction

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4

Which of the following statement is wrong?

A. The angular clearance on dies varies from 0.5° to 1°

B. In drawing operation, the metal flows due to plasticity

C. In press operation, the size of the pierced hole is independent of the size of punch

D. None of the above