Cast iron during machining produces
Continuous chips
Discontinuous chips
Continuous chips with built-up edge
None of these
Correct Answer :
B. Discontinuous chips
Related Questions
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
The angle between the lathe centres is
30°
45°
60°
90°
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 specific cutting energy used for establishing the machinability of the metal depends upon its
Coefficient of friction
Microstructure
Work hardening characteristics
All of these
The thrust force will increase with the increase in
Side cutting edge angle
Tool nose radius
Rake angle
End cutting edge angle
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
The lead screw of a lathe has _________ threads.
Single start
Double start
Multi-start
Any one of these
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 plunge grinding
The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face
The method of centre less grinding used to produce taper is
In-feed grinding
Through feed grinding
End feed grinding
Any one of these
Grinding wheels should be tested for balance
Only at the time of manufacture
Before starting the grinding operation
At the end of grinding operation
Occasionally
The structure of a grinding wheel depends upon
Hardness of the material being ground
Nature of the grinding operation
Finish required
All of these
What is the method of brazing used to join relatively small assemblies made from materials that either do not oxidize at the brazing temperature or can be protected from oxidation with a flux?
Torch brazing
Dip brazing
Resistance brazing
Furnace brazing
When the shear angle is large
Path of shear is short and chip is thin
Path of shear is large and chip is thick
Path of shear is short and chip is thick
Path of shear is large and chip is thin
A dynamometer is a device used for the measurement of
Chip thickness ratio
Forces during metal cutting
Wear of the cutting tool
Deflection of the cutting tool
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
Quality screw threads are produced by
Thread milling
Thread chasing
Thread cutting with single point tool
Thread casting
Gears can be best produced on mass production by
Shaping
Casting
Forming
Hobbing
In a plain milling machine, the table can be moved
Longitudinally
Crosswise
Vertically
All of these
A __________ grinding wheel is used to grind soft materials.
Course grained
Medium grained
Fine grained
None of these
A hole is of dimension φ = 9 ₊0⁺⁰⁰¹⁵ mm. The corresponding shaft is of dimension φ = 9 ₊0.001⁺⁰⁰¹⁰ mm. The resulting assembly has
Loose running fit
Close running fit
Transition fit
Interference fit
A bottoming tap has
Its end tapered for about three or four threads
Its end tapered for about eight or ten threads
Full threads for the whole of its length
None of the above
Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles on and 2 cycles off Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.
2.17 rpm, 600 joules
6.8 rpm, 6 joules
5.03 rpm, 600 joules
22 rpm, 600 joules
In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.
Globular transfer
Spray transfer
GMAW practice
Dip transfer
In drilling aluminium, a drill with
Zero helix angle is used
Low helix angle is used
High helix angle is used
Any helix angle can be used
High speed steel tools retain their hardness upto a temperature of
250°C
350°C
500°C
900°C
The tool life is affected by
Depth of cut
Cutting speed
Feed
All of these
Larger end cutting edge angle _________ tool life.
Increases
Decreases
Does not effect
None of these
In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is
Cylindrical grinder
Internal grinder
Surface grinder
Tool and cutter grinder
The machining of titanium is difficult due to
High thermal conductivity of titanium
Chemical reaction between tool and work
Low tool-chip contact area
None of these