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What is the correct answer?

4

The usual value of the helix angle of a drill is

A. 20°

B. 30°

C. 45°

D. 60°

Correct Answer :

B. 30°


Related Questions

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4

A tool used to withdraw a drill from the sleeve is called

A. Drill remover

B. Drill puller

C. Drift

D. Drill drawer

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4

The cutting tool in a milling machine is mounted on

A. Spindle

B. Arbor

C. Column

D. Knee

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4

Crater wear is predominant in

A. Carbon tool steels

B. Tungsten carbide tools

C. High speed steel tools

D. Ceramic tools

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4

Cast iron during machining produces

A. Continuous chips

B. Discontinuous chips

C. Continuous chips with built-up edge

D. None of these

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4

In centreless grinding, the surface speed of regulating wheel is

A. 5 to 15 m/min

B. 15 to 60 m/min

C. 60 to 90 m/min

D. 90 to 120 m/min

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4

Side relief angle of a single point tool is the angle

A. By which the face of the tool is inclined towards back

B. By which the face of the tool is inclined sideways

C. Between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool

D. Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base

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4

In centre less grinders, the maximum angular adjustment of the regulating wheel is

A.

B. 10°

C. 15°

D. 20°

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4

The chuck preferred for quick setting and accurate centering of a job is

A. Four jaw independent chuck

B. Collect chuck

C. Three jaw universal chuck

D. Magnetic chuck

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4

Crater wear occurs mainly on the

A. Nose part, front relief face and side relief face of the cutting tool

B. Face of the cutting tool at a short distance from the cutting edge only

C. Cutting edge only

D. Front face only

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4

If the cutting speed is increased, then the built-up-edge

A. Becomes longer

B. May or may not form

C. Becomes smaller and finally does not form at all

D. Has nothing to do with speed

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4

The purpose of jigs and fixtures is to

A. Increase machining accuracy

B. Facilitate interchangeability

C. Decrease expenditure on quality control

D. All of these

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4

In orthogonal turning of a low carbon steel bar of diameter 150 mm with uncoated carbide tool, the cutting velocity is 90 m/min. The feed is 0.24 mm/rev and the depth of cut is 2mm. The chip thickness obtained is 0.48 mm. If the orthogonal rake angle is zero and the principle cutting edge angle is 90⁰, the shear angle in degree is

A. 20.56

B. 26.56

C. 30.56

D. 36.56

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4

When the shear angle is small

A. Path of shear is short and chip is thin

B. Path of shear is large and chip is thick

C. Path of shear is short and chip is thick

D. Path of shear is large and chip is thin

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4

In a shaper, the metal is removed during

A. Forward stroke

B. Return stroke

C. Both the forward and return strokes

D. Neither the forward nor the return stroke

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4

In a centre lathe, the cutting tool is fed in _________ with reference to the lathe axis.

A. Cross direction only

B. Longitudinal direction only

C. Both cross and longitudinal direction

D. Any direction

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4

The vector sum of cutting velocity and chip velocity is __________ shear velocity.

A. Equal to

B. Less than

C. More than

D. None of these

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4

Which of the following statement is correct as regard to up milling?

A. It cannot be used on old machines due to backlash between the feed screw of the table and the nut.

B. The chips are disposed off easily and do not interfere with the cutting.

C. The surface milled appears to be slightly wavy.

D. The coolant can be poured directly at the cutting zone where the cutting force is maximum.

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4

A ring gauge is used to measure

A. Outside diameter but not roundness

B. Roundness but not outside diameter

C. Both outside diameter and roundness

D. Only external threads

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4

The point angle of a drill, for drilling stainless steel, is

A. 90°

B. 118°

C. 135°

D. 150°

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4

The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is

A. Feed rate, depth of cut, cutting speed

B. Depth of cut, cutting speed, feed rate

C. Cutting speed, feed rate, depth of cut

D. Feed rate, cutting speed, depth of cut

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4

What is the type of joining process called, where the parts to be welded are kept in contact and rotated relative to each other and axial pressure is applied when the desired temperature is obtained?

A. Ultrasonic welding

B. Forge welding

C. Electron beam welding

D. Friction welding

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4

A process of removing metal by pushing or pulling a cutting tool is called

A. Up milling

B. Down milling

C. Forming

D. Broaching

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4

The hard grade grinding wheels are denoted by the letters

A. A to H

B. I to P

C. Q to Z

D. A to P

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4

A lathe with four steps on the cone pulley and with back-gears will have

A. Four direct speeds

B. Four indirect speeds

C. Four direct and four indirect speeds

D. Eight indirect speeds

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4

The cutting fluid mostly used for machining alloy steels is

A. Water

B. Soluble oil

C. Dry

D. Sulphurised mineral oil

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4

In machining metals, surface roughness is due to

A. Feed marks or ridges left by the cutting tool

B. Fragment of built-up edge on the machined surface

C. Cutting tool vibrations

D. All of these

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4

When the temperature of a solid metal increases,

A. Strength of the metal decreases but ductility increases

B. Both strength and ductility of the metal decreases

C. Both strength and ductility of the metal increases

D. Strength of the metal increases but ductility decreases

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4

The specific cutting energy used for establishing the machinability of the metal depends upon its

A. Coefficient of friction

B. Microstructure

C. Work hardening characteristics

D. All of these

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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 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