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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

Correct Answer :

D. Sulphurised mineral oil


Related Questions

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4

The parameter which completely defines the chip formation in a metal cutting process is

A. Shear angle

B. Chip-tool contact length

C. Both (A) and (B)

D. None of these

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4

Which of the following statement is wrong?

A. The diamond is the hardest tool material and can run at cutting speeds about 50 times that of high speed steel tool.

B. The ceramic tools can be used at cutting speeds 40 times that of high speed steel tools.

C. The cemented carbide tools can be used at cutting speeds 10 times that of high speed steel tools.

D. The ceramic tools can withstand temperature upto 600°C only.

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4

The surface finish is improved by the increase in

A. Cutting speed

B. Nose radius

C. True rake angle

D. All of these

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4

Gears can be best produced on mass production by

A. Shaping

B. Casting

C. Forming

D. Hobbing

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4

In American Standard Association (A S A) system, if the tool nomenclature is 8-6-5-5-10-15-2 mm, then the side rake angle will be

A.

B.

C.

D. 10°

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4

Which of the following operations is carried out at a minimum cutting velocity if the machines are equally rigid and the tool work materials are the same?

A. Turning

B. Grinding

C. Boring

D. Milling

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4

In DC arc welding, if leads are arranged in work as Negative pole of the welding arc and electrode as Positive pole of the welding arc, the arrangement is known as

A. Fusion

B. Reverse polarity

C. Forward welding

D. Direct polarity

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4

A fine grained grinding wheel is used to grind

A. Hard and brittle materials

B. Soft and ductile materials

C. Hard and ductile materials

D. Soft and brittle materials

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4

The cutting speed is maximum while machining __________ with a high speed steel tool.

A. Cast iron

B. Mild steel

C. Brass

D. Aluminium

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4

A twist drill is specified by its

A. Shank, material and diameter

B. Shank, lip angle and size of flute

C. Material, length of body and helix angle

D. Any one of these

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4

The material property which depends only on the basic crystal structure is

A. Fatigue strength

B. Work hardening

C. Fracture strength

D. Elastic constant

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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

EDM machining is applied for

A. Shaping carbide dies and punches having complicated profiles

B. Making large number of small holes in sieves and fuel nozzles

C. Embossing and engraving on harder materials

D. All of these

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4

For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of

A. 50°C

B. 100°C

C. 175°C

D. 275°C

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4

Crater wear leads to

A. Increase in cutting temperature

B. Weakening of tool

C. Friction and cutting forces

D. All of these

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4

Low helix angle drills are preferred for drilling holes in

A. Plastics

B. Copper

C. Cast steel

D. Carbon steel

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4

Match the following metal forming processes with their associated stresses in the work piece.
Metal forming processTypes of stress
1. CoiningP. Tensile
2. Wire DrawingQ. Shear
3. BlankingR. Tensile and compressive
4. Deep DrawingS. Compressive

A. 1-S, 2-P, 3-Q, 4-R

B. 1-S, 2-P, 3-R, 4-Q

C. 1-P, 2-Q, 3-S, 4-R

D. 1-P, 2-R, 3-Q, 4-S

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4

The size of a lathe is specified by the

A. Length between centres

B. Swing diameter over the bed

C. Swing diameter over the carriage

D. All of these

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4

The hardness of a grinding wheel is specified by

A. Brinell hardness number

B. Rockwell hardness number

C. Vickers pyramid number

D. Letter of alphabet

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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

Stellite preserves hardness upto a temperature of

A. 350°C

B. 500°C

C. 900°C

D. 1100°C

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4

What is the type of welding defect caused due to shrinkage during solidification and by weld stresses called?

A. Incomplete fusion

B. Lamellar tearing

C. Mismatch

D. Shrinkage void

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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

What is the type of welding defect is caused due to stresses on heating and cooling called?

A. Incomplete penetration

B. Shrinkage void

C. Slag Entrapment (Inclusions)

D. Incomplete fusion

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4

The common welding error that occurs due to shrinkage of weld metal, faulty clamping of parts, faulty penetration or overheating at joints is called?

A. Distortion

B. Warping

C. Porous weld

D. Poor fusion

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4

Ceramic tools are fixed to tool body by

A. Soldering

B. Brazing

C. Welding

D. Clamping

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4

Tool life is measured by the

A. Number of pieces machined between tool sharpenings

B. Time the tool is in contact with the job

C. Volume of material removed between tool sharpenings

D. All of the above

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4

The lip clearance angle is the angle formed by the

A. Leading edge of the land with a plane having the axis of the drill

B. Flank and a plane at right angles to the drill axis

C. Chisel edge and the lip as viewed from the end of a drill

D. None of the above

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4

Lathe bed is made of

A. Mild steel

B. Alloy steel

C. Pig iron

D. Chilled cast iron

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4

The method of centre less grinding used to produce taper is

A. In-feed grinding

B. Through feed grinding

C. End feed grinding

D. Any one of these