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4

A bottoming tap has

A. Its end tapered for about three or four threads

B. Its end tapered for about eight or ten threads

C. Full threads for the whole of its length

D. None of the above

Correct Answer :

C. Full threads for the whole of its length


Related Questions

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4

A solid cylinder of diameter 100 mm and height 50 mm is forged between two frictionless flat dies to a height of 25mm. The percentage change in diameter is

A. 0

B. 2.07

C. 20.7

D. 41.4

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4

The cutting speed is minimum while machining _________ with a high speed steel tool.

A. Cast iron

B. Mild steel

C. Brass

D. Aluminium

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4

While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is

A. Independent of index change gear ratio

B. Dependent on speed change gear ratio

C. Interrelated to index change gear ratio

D. Independent of speed and index change gear ratio

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4

The factor responsible for the formation of continuous chips with built up edge is

A. Low cutting speed and large rake angle

B. Low cutting speed and small rake angle

C. High cutting speed and large rake angle

D. High cutting speed and small rake angle

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4

In drilling softer materials, the cutting speed is _________ as compared to harder materials.

A. Same

B. Low

C. High

D. None of these

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4

In machining metals, chips break due to __________ of work material.

A. Toughness

B. Ductility

C. Elasticity

D. Work hardening

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4

Glazing in grinding wheels takes place when the

A. Wheel is too hard or wheel revolves at a very high speed

B. Wheel is too soft or wheel revolves at a very slow speed

C. Wheel is too hard and wheel revolves at very slow speed

D. Wheel is too soft and wheel revolves at a very high speed

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4

The chamfering is an operation of

A. Bevelling the extreme end of a workpiece

B. Embossing a diamond shaped pattern on the surface of a workpiece

C. Reducing the diameter of a workpiece over a very narrow surface

D. Enlarging the end of a hole cylindrically

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4

The effect of setting a boring tool above centre height leads to

A. Increase in the effective rake angle and a decrease in the effective clearance angle

B. Increase in both effective rake angle and effective clearance angle

C. Decrease in the effective rake angle and an increase in the effective clearance angle

D. Decrease in both effective rake angle and effective clearance angle

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4

The rake angle of a single point cutting tool corresponds to _________ of a twist drill.

A. Lip clearance angle

B. Helix angle

C. Point angle

D. Chisel edge angle

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4

A 15 mm drilling machine means that it can drill a hole

A. Of maximum diameter 15 mm

B. In 15 mm thick plates

C. Having cross-sectional area of 15 mm²

D. None of these

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4

Which one among the following welding processes uses nonconsumable electrode?

A. Gas metal arc welding

B. Submerged arc welding

C. Gas tungsten arc welding

D. Flux coated arc welding

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4

Soft materials can not be economically ground due to

A. High temperature involved

B. Frequent wheel clogging

C. Rapid wheel wear

D. Low work piece stiffness

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4

In up-cut milling the work piece is fed

A. Against the rotating cutter

B. At angle of 60° to the cutter

C. In the direction of the cutter

D. At the right angle to the cutter

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4

What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?

A. Porosity

B. Undercut

C. Under fill

D. Crack

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4

An expendable pattern is used in

A. Slush casting

B. Squeeze casting

C. Centrifugal casting

D. Investment casting

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4

In order to obtain a surface finish in the range of 0.75 μm to 1.25 μm , the operation used is called.

A. Grinding

B. Lapping

C. Honing

D. Buffing

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4

Discontinuous chips are formed during machining of

A. Brittle metals

B. Ductile metals

C. Hard metals

D. Soft metals

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4

The maximum possible draft in cold rolling of sheet increases with the

A. Increase in coefficient of friction

B. Decrease in coefficient of friction

C. Decrease in roll radius

D. Decrease in roll velocity

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4

Which of the following process is used for preparing parts having large curved surfaces and thin sections?

A. Hot machining

B. Ultrasonic machining

C. ECM process

D. Chemical milling

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4

The helix angle of a drill is __________ for drilling brass.

A. Equal to 30°

B. Less than 30°

C. More than 30°

D. None of these

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4

The tool life is affected by

A. Depth of cut

B. Cutting speed

C. Feed

D. All of these

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4

In drilling aluminium, a drill with

A. Zero helix angle is used

B. Low helix angle is used

C. High helix angle is used

D. Any helix angle can be used

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4

Crater wear is mainly due to the phenomenon known as

A. Adhesion of metals

B. Oxidation of metals

C. Diffusion of metals

D. All of these

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4

The cutting speed of a drill depends upon the

A. Material of drill

B. Type of material to be drilled

C. Quality of surface finish desired

D. All of these

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4

The aluminium oxide abrasive is chiefly used for grinding

A. High speed steel

B. Carbon steel

C. Wrought iron

D. All of these

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4

Cold working of steel is defined as working

A. At its recrystallisation temperature

B. Above its recrystallisation temperature

C. Below its recrystallisation temperature

D. At two thirds of the melting temperature of the metal

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4

In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called

A. Friction zone

B. Work-tool contact zone

C. Shear zone

D. None of these

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4

The binding material used in cemented carbide tools is

A. Tungsten

B. Chromium

C. Silicon

D. Cobalt

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4

What is the name of the device used in arc welding circuits for the purpose of modifying the rate of current change when the weld road is varied rapidly?

A. Reactor

B. Kerf

C. Inductor

D. Cone