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?
Ultrasonic welding
Forge welding
Electron beam welding
Friction welding
Correct Answer :
D. Friction welding
Related Questions
In determining the various forces on the chip, Merchant assumed that the
Cutting edge of the tool is sharp and it does not make any flank contact with the workpiece
Only continuous chip without built-up-edge is produced
Cutting velocity remains constant
All of the above
In Oxyacetylene gas welding, temperature at the inner cone of the flame is around
3500⁰C
3200⁰C
2900⁰C
2550⁰C
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
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
The vector sum of cutting velocity and chip velocity is __________ shear velocity.
Equal to
Less than
More than
None of these
The operation of smoothing and squaring the surface around a hole is known as
Counter-sinking
Counter-boring
Trepanning
Spot facing
In metal cutting, use of low feeds and high cutting speeds is desired when the objective is
High metal removal rate
Dry machining
Use of soft cutting tool
Surface finish
The broaching operation in which the work moves past the stationary tool is called
Pull broaching
Push broaching
Surface broaching
Continuous broaching
An expendable pattern is used in
Slush casting
Squeeze casting
Centrifugal casting
Investment casting
For fast removal of materials during grinding, a _________ grinding wheel is used.
Course grained
Fine grained
Medium grained
None of these
A shaft has a dimension, φ9 +0.025⁺⁰⁰⁰⁹, the respective values of fundamental deviation and tolerance are
- 0.025, ±0.008
- 0.025, 0.016
- 0.009, ± 0.008
- 0.009, 0.016
If the flame of the welding torch is directed towards the progress of welding, then what will you call the welding technique?
Forehand welding
Flux cored ARC welding
Electro slag welding
Pulsed spray welding
Buffing wheels are made of
Softer metals
Cotton fabric
Carbon
Graphite
In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate
Increases continuously
Decreases continuously
Decreases, becomes stable and then increases.
Increases, becomes stable and then decreases.
Hard and tough materials like cast iron should be turned at
Slow speed
High speed
Any speed
Certain specific speed
In a milling operation, two side milling cutters are mounted with a desired distance between them so that both sides of a workpiece can be milled simultaneously. This set up is called
Gang milling
Straddle milling
String milling
Side milling
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
The process of changing the shape of grinding wheel as it becomes worn due to breaking away of the abrasive and bond, is called
Truing
Dressing
Facing
Clearing
In metal machining, the work-tool contact zone is a zone where heat is generated due to
Plastic deformation of metal
Burnishing friction
Friction between the moving chip and the tool face
None of the above
Which of the following statement is wrong?
The diamond is the hardest tool material and can run at cutting speeds about 50 times that of high speed steel tool.
The ceramic tools can be used at cutting speeds 40 times that of high speed steel tools.
The cemented carbide tools can be used at cutting speeds 10 times that of high speed steel tools.
The ceramic tools can withstand temperature upto 600°C only.
The process of improving the cutting action of the grinding wheel is called
Truing
Dressing
Facing
Clearing
Which of the following statement is incorrect with reference of lathe cutting tools?
The flank of the tool is the surface or surfaces below and adjacent to the cutting edges
The nose is the corner, arc or chamfer joining the side cutting and the end cutting edges
The heel is that part of the tool which is shaped to produce the cutting edges and face
The base is that surface of the shank which bears against the support and takes tangent pressure of the cut
The cutting angle of a flat drill varies from
3° to 8°
20° to 30°
60° to 90°
90° to 120°
Threading is an operation of
Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Cutting helical grooves on the external cylindrical surface
The cutting speed for drilling copper with high speed steel drills varies from
10 to 20 m/min
18 to 30 m/min
24 to 45 m/min
60 to 90 m/min
In ultrasonic machining, the metal is removed by
Using abrasive slurry between the tool and work
Direct contact of tool with the work
Maintaining an electrolyte between the work and tool in a very small gap between the two
Erosion caused by rapidly recurring spark discharges between the tool and work
If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is
Conical locator
Cylindrical locator
Diamond pin locator
Vee locator
In machining metals, chips break due to __________ of work material.
Toughness
Ductility
Elasticity
Work hardening
Trepanning is an operation of
Making a cone-shaped enlargement of the end of a hole
Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
A push broach as compared to pull broach
Has less number of teeth
Is short and stocky
Removes less material for each pass of the tool
All of the above