For fast removal of materials during grinding, a _________ grinding wheel is used.
Course grained
Fine grained
Medium grained
None of these
Correct Answer :
A. Course grained
Related Questions
The correct sequence of tool materials in increasing order of their ability to retain their hot hardness is
Carbide, ceramic, cermet, borazon
Ceramic, carbide, borazon, cermet
Cermet, carbide, ceramic, borazon
Borazon, ceramic, carbide, cermet
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
20.56
26.56
30.56
36.56
The abrasive slurry used in ultrasonic machining contains fine particles of
Aluminium oxide
Boron carbide
Silicon carbide
Any one of these
A type of welding flows, which is the result of a perfect proportion and mixture of acetylene and oxygen and is used for fusion welding of steel and cast iron, is
Carburizing flame
Oxidizing flame
Oxy-acetylene flame
Neutral flame
The relief or clearance at the cutting edge of a flat drill varies from
3° to 8°
20° to 30°
60° to 90°
90° to 120°
The cutting speed for counter-boring should be _________ that of drilling operation.
Equal to
Less than
Greater than
None of these
A mandrel is used to hold
An eccentric work
A heavy work
A thin work
None of these
A fixture is defined as a device which
Holds and locates a workpiece and guides and controls one or more cutting tools
Holds and locates a workpiece during an inspection or for a manufacturing operation
Is used to check the accuracy of workpiece
All of the above
In drilling operation, the metal is removed by
Shearing
Extrusion
Shearing and extrusion
Shearing and compression
The lathe centres are provided with standard taper known as
Morse taper
Seller's taper
Chapman taper
Brown and Sharpe taper
Crack in grinding wheel is developed due to
High temperature developed at the contact of the wheel face and work
Grinding hard work
Low speed of wheel
High speed of wheel
Which of the following process is used for preparing parts having large curved surfaces and thin sections?
Hot machining
Ultrasonic machining
ECM process
Chemical milling
Slow speed of the spindle is necessary in
Thread cutting
Turning a work of larger diameter
Turning a hard or tough material
All of these
Negative rakes are used for
Carbide tools
Heavy loads
Harder materials
All of these
While current is shut down in the welding circuit, what kind of voltage exists between the output terminals of the welding machine?
GTAW
Open air cut voltage
Kerf
Gouging
Which of the following operations can be performed with milling cutters?
Cutting key ways on shafts
Cutting external screw threads
Cutting teeth of spur gears
All of these
In centre less grinders, the maximum angular adjustment of the regulating wheel is
5°
10°
15°
20°
Jigs are used
For holding and guiding the tool in drilling, reaming or tapping operations
For holding the work in milling, grinding, planing or turning operations
To check the accuracy of workpiece
None of the above
In a plain milling cutter, the portion of the gash adjacent to the cutting edge on which the chip impinges is called
Face
Fillet
Land
Lead
A set of eight form relieved milling cutters for each module is provided to enable cutting of gears of different
Materials
Types of gears
Number of teeth
Width of gears
Gears can be best produced on mass production by
Shaping
Casting
Forming
Hobbing
In up milling, the thickness of chip is
Minimum at the beginning of the cut and maximum at the end of the cut
Maximum at the beginning of the cut and minimum at the end of the cut
Uniform throughout the cut
None of these
In machining metal, cutting force at the cutting edge is measured by a
Wattmeter
Dynamometer
Hydrometer
Pyrometer
The common welding error that occurs due to shrinkage of weld metal, faulty clamping of parts, faulty penetration or overheating at joints is called?
Distortion
Warping
Porous weld
Poor fusion
In hot machining, tool is made of
Tungsten carbide
Brass or copper
Diamond
Stainless steel
The enlarging of an existing circular hole with a rotating single point tool is called
Boring
Drilling
Reaming
Internal turning
An open structure of a grinding wheel is used for
Soft materials
Tough materials
Ductile materials
All of these
The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is
Feed rate, depth of cut, cutting speed
Depth of cut, cutting speed, feed rate
Cutting speed, feed rate, depth of cut
Feed rate, cutting speed, depth of cut
The negative rake is usually provided on
High carbon steel tools
High speed steel tools
Cemented carbide tools
All of these
In metal machining, the zone where the maximum heat is generated due to the plastic deformation of metal, is called
Friction zone
Work-tool contact zone
Shear zone
None of these