Cold working of steel is defined as working
At its recrystallisation temperature
Above its recrystallisation temperature
Below its recrystallisation temperature
At two thirds of the melting temperature of the metal
Correct Answer :
C. Below its recrystallisation temperature
Related Questions
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
Green sand mould indicates that
Polymeric mould has been cured
Mould has been totally dried
Mould is green in colour
Mould contains moisture
The tool material, for faster machining, should have
Wear resistance
Red hardness
Toughness
All of these
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
If a particular Fe-C alloy contains less than 0.83% carbon, it is called
High speed steel
Hypo eutectoid steel
Hyper eutectoid steel
Cast iron
The stroke of a shaping machine is 250 mm. It makes 30 double strokes per minute. The overall average speed of operation is
3.75 m/min
5 m/min
7.5 m/min
15 m/min
What type of fusion welding process is used for welding sheet metals of all engineering metals (except Cu, Ag) in automobile and air craft industries, pipe and tubing production?
Thermit welding
Electroslag welding
Resistance welding
Submerged arc welding
The hardness of a grinding wheel is specified by
Brinell hardness number
Rockwell hardness number
Vickers pyramid number
Letter of alphabet
The chamfering is an essential operation after
Knurling
Rough turning
Boring
Thread cutting
The cutting speed is minimum while machining _________ with a high speed steel tool.
Cast iron
Mild steel
Brass
Aluminium
The factor responsible for the formation of discontinuous chips is
Low cutting speed and large rake angle
Low cutting speed and small rake angle
High cutting speed and large rake angle
High cutting speed and small rake angle
Friction at the tool-chip interface can be reduced by
Decreasing the rake angle
Increasing the depth of cut
Decreasing the cutting speed
Increasing the cutting speed
The in-feed grinding is used to
Produce tapers
Grind shoulders and formed surfaces
Grind long, slender shafts or bars
All of these
The chuck preferred for quick setting and accurate centering of a job is
Four jaw independent chuck
Collect chuck
Three jaw universal chuck
Magnetic chuck
The shear velocity is the velocity of
Tool relative to the workpiece
Chip relative to the tool
Tool along the tool face
None of these
Cutting fluids are used to
Cool the tool
Improve surface finish
Cool the workpiece
All of these
Hot rolling of mild steel is carried out
At recrystallization temperature
Between 100⁰C to 150⁰C
Between recrystallization temperature
Above recrystallization temperature
The tool life is affected by
Depth of cut
Cutting speed
Feed
All of these
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
The cutting speed for counter-boring should be _________ that of drilling operation.
Equal to
Less than
Greater than
None of these
Down milling is also called
Conventional milling
Climb milling
End milling
Face milling
The size of a lathe is specified by the
Length between centres
Swing diameter over the bed
Swing diameter over the carriage
All of these
In a metal arc welding process, metal transfer across the arc may take place by a method of material transfer where the metal transfers across the arc is in larger drops. This is at the rate of 100 drops / sec or less, what is this known as
Globular transfer
Spray transfer
GMAW practice
Dip transfer
In which of the following milling machine, the table can be tilted in a vertical plane by providing a swivel arrangement at the knee?
Universal milling machine
Plain milling machine
Universal milling machine
Hand milling machine
It is desired to perform the operations like drilling, reaming, counter-boring etc. on a work piece. Which of the following machine will be used?
Sensitive drilling machine
Radial drilling machine
Gang drilling machine
Multiple spindle drilling machine
Gear lapping is an operation
After heat treatment
Prior to heat treatment
For gear reconditioning
None of these
Glazing in grinding wheels takes place when the
Wheel is too hard or wheel revolves at a very high speed
Wheel is too soft or wheel revolves at a very slow speed
Wheel is too hard and wheel revolves at very slow speed
Wheel is too soft and wheel revolves at a very high speed
High speed steel tools retain their hardness upto a temperature of
250°C
350°C
500°C
900°C
A mandrel is used to hold
An eccentric work
A heavy work
A thin work
None of these
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