The blank diameter used in thread rolling will be
Equal to minor diameter of the thread
Equal to pitch diameter of the thread
A little larger than the minor diameter of the thread
A little larger than the pitch diameter of the thread
Correct Answer :
C. A little larger than the minor diameter of the thread
Related Questions
Rotary swaging
Is extensively used for making bolts and rivets
Is used for reducing the diameters of round bars and a tube by rotating dies which open and close rapidly on the work
Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part
The width of slot cut by a hacksaw blade is _______ the width of the blade.
Equal to
Less than
Greater than
None of these
The metal is subjected to mechanical working for
Refining grain size
Reducing original block into desired shape
Controlling the direction of flow lines
All of these
In electric resistance welding, pressure applied varies from
1 to 5 MPa
5 to 10 MPa
10 to 25 MPa
25 to 55 MPa
A hacksaw blade is specified by its
Length
Material
Width
Number of teeth
Seam welding is a
Continuous spot welding process
Multi-spot welding process
Arc welding process
Process used for joining round bars
A file with 20 teeth in 25 mm is called
Rough file
Bastard file
Second cut file
Smooth file
In a cold chamber die casting machine, only nonferrous alloys with _________ are casted.
Low melting temperature
High melting temperature
Both (A) and (B)
None of these
The acetylene cylinder is usually painted with
Black colour
White colour
Maroon colour
Yellow colour
Thermit, used in Thermit welding, is a mixture of
Charcoal and iron oxide
Charcoal and aluminium
Iron oxide and aluminium
Charcoal, iron oxide and aluminium
A zinc diffusion process is called
Galvanising
Anodising
Parkerising
Sherardizing
Most of the oxyacetylene welding is done with
Neutral flame
Oxidising flame
Carburising flame
All of these
The surface to be left unmachined is marked on the pattern by
Red colour
Yellow colour
Black colour
Blue colour
Thread rolling is restricted to
Ferrous materials
Ductile materials
Hard materials
None of these
According to Indian standards, the total numbers of tolerance grades are
8
12
18
20
A diamond pointed chisel is used for cutting
Flat surfaces
Grooves
Keyways
V-shaped grooves
The type of file used for a wood work is
Single cut file
Double cut file
Rasp cut file
Any one of these
The welding set up is said to have straight polarity, when
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the negative terminal and the electrode holder to the positive terminal
Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder is earthed
A jolt machine is used to
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform sand hardness throughout the mould
Produce uniform packing of sand in the mould
A hacksaw blade cuts on the
Forward stroke
Return stroke
Both forward and return strokes
Cutting depends upon the direction of force
In ________ welding, the weld may be made either from left to right or from right to left.
Forehand
Backhand
Vertical
None of these
For welding plates of thickness more than 12.5 mm, its edges
Do not require bevelling
Should be bevelled to a single-V or U-groove
Should have a double-V or U-groove on one side
Should have a double-V or U-groove on both sides
The surface to be machined is marked on the pattern by
Red colour
Yellow colour
Black colour
Blue colour
The oxygen cylinder is usually painted with
Black colour
White colour
Maroon colour
Yellow colour
For smoothing and cleaning out depressions in the mould, a __________ is used.
Slick
Lifter
Swab
Gagger
The cold chisels are made by
Drawing
Rolling
Piercing
Forging
If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be
10 mm/m
16 mm/m
20 mm/m
26 mm/m
Cast iron and steel pipes are produced by
Slush casting
Investment casting
True centrifugal casting
Die casting
In a centrifugal casting method
Core is made of sand
Core is made of ferrous metal
Core is made of nonferrous metal
No core is used
The dowels are
Wooden nails
Box nails
Wire nails
None of these