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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

Correct Answer :

A. Grinding


Related Questions

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4

In a gating system, the ratio 1: 2: 4 represents

A. Sprue base area: runner area: ingate area

B. Pouring basin area: ingate area: runner area

C. Sprue base area: ingate area: casting area

D. Runner area: ingate area: casting area

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4

The relation between tool life (T) and cutting speed (V) is VTn = Constant. In this relation, the value of n depends upon

A. Work material

B. Tool material

C. Working conditions

D. Type of chip produced

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4

If the flame of the welding torch is directed towards the progress of welding, then what will you call the welding technique?

A. Forehand welding

B. Flux cored ARC welding

C. Electro slag welding

D. Pulsed spray welding

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4

Crack in grinding wheel is developed due to

A. High temperature developed at the contact of the wheel face and work

B. Grinding hard work

C. Low speed of wheel

D. High speed of wheel

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4

Volume of a cube of side l and volume of a sphere of radius r are equal. Both the cube and the sphere are solid and of same material. They are being cast. The ratio of the solidification time of the cube to the same of the sphere is

A. (4π/6)³ × (r/l)⁶

B. (4π/6) × (r/l)²

C. (4π/6)² × (r/l)³

D. (4π/6)² × (r/l)⁴

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4

The enlarging of an existing circular hole with a rotating single point tool is called

A. Boring

B. Drilling

C. Reaming

D. Internal turning

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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

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

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4

Jigs are used

A. For holding and guiding the tool in drilling, reaming or tapping operations

B. For holding the work in milling, grinding, planing or turning operations

C. To check the accuracy of workpiece

D. None of the above

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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

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

Which of the following arc welding processes does not use consumable electrodes?

A. GMAW

B. GTAW

C. Submerged Arc Welding

D. None 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

In hot machining, the work is heated by

A. Simple heating

B. Flame heating

C. Induction heating

D. Any one of these

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4

The height of each tooth of a broach is

A. Same throughout

B. In progressively decreasing order

C. In progressively increasing order

D. None of these

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4

In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become

A. Half

B. Two times

C. Eight times

D. Sixteen times

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4

A taper 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

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4

The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called

A. Ceramic

B. Stellite

C. Diamond

D. Cemented carbide

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4

The factor considered for evaluation of machinability is

A. Cutting forces and power consumption

B. Tool life

C. Type of chips and shear angle

D. All of these

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4

In a plain milling cutter, the portion of the gash adjacent to the cutting edge on which the chip impinges is called

A. Face

B. Fillet

C. Land

D. Lead

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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

The method of grinding used to produce internal cylindrical holes and tapers, is

A. Internal cylindrical grinding

B. Form grinding

C. External cylindrical grinding

D. Surface grinding

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4

If the helix angle of the drill is made _________ 30°, then the torque required to drive the drill at a given feed will be more.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The grinding of long, slender shafts or bars is usually done by

A. In-feed grinding

B. Through feed grinding

C. End-feed grinding

D. Any one of these

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4

The lead screw of a lathe has _________ threads.

A. Single start

B. Double start

C. Multi-start

D. Any one of these

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4

A grinding wheel is said to be of _________ if it holds the abrasive grains more securely.

A. Soft grade

B. Medium grade

C. Hard grade

D. None of these

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4

In a plain milling machine, the table can be moved

A. Longitudinally

B. Crosswise

C. Vertically

D. All of these

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4

The tail stock set over method of taper turning is preferred for

A. Internal tapers

B. Small tapers

C. Long slender tapers

D. Steep tapers

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4

In _________ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.

A. Up milling

B. Down milling

C. Face milling

D. End milling

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4

Dielectric is used in

A. Electrochemical machining

B. Ultrasonic machining

C. Electro discharge machining

D. Laser machining