In submerged arc welding, an arc is produced between a
Carbon electrode and the work
Metal electrode and the work
Bare metal electrode and the work
Two tungsten electrodes and the work
Correct Answer :
C. Bare metal electrode and the work
Related Questions
The flux commonly used in brazing is
Zinc chloride
Ammonium chloride
Rosin plus alcohol
Borax
A basic shaft is one whose
Lower deviation is zero
Upper deviation is zero
Lower and upper deviations are zero
None of these
A hacksaw blade is specified by its
Length
Material
Width
Number of teeth
In spot welding, the distance between the nearest edge of the plate and centre of weld should be equal to
d
1.5d
3d
6d
The operation of cutting of a flat sheet to the desired shape is called
Shearing
Piercing
Punching
Blanking
A ring gauge is used to
Check the diameter of shafts or studs
Test the accuracy of holes
Check the clearance between two mating surfaces
All of the above
The parts of circular cross-section which are symmetrical about the axis of rotation are made by
Hot forging
Hot spinning
Hot extrusion
Hot drawing
In welding copper alloys with TIG arc welding
Direct current with straight polarity is used
Direct current with reversed polarity is used
Alternating current is used
Any one of these
Spot welding is used for welding
Lap joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having thickness above 3 mm
Butt joints in plates having 0.025 mm to 1.25 mm thickness
Butt joints in plates having thickness above 3 mm
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
Blanking and piercing operations can be performed simultaneously in a
Simple die
Progressive die
Compound die
Combination die
For gas welding, the pressure desired at the welding torch for acetylene is
7 to 103 kN/m²
70 to 280 kN/m²
280 to 560 kN/m²
560 to 840 kN/m²
A diamond pointed chisel is used for cutting
Flat surfaces
Grooves
Keyways
V-shaped grooves
The cold chisels are made by
Drawing
Rolling
Piercing
Forging
According to Indian standards, the total numbers of tolerance grades are
8
12
18
20
In order to produce uniform packing of sand in the moulds, a __________ is used.
Sand slinger
Squeezing machine
Jolt machine
Stripper plate machine
In a ________, two or more operations are performed simultaneously at the single stroke of the ram.
Simple die
Progressive die
Combination die
Compound die
The surface to be left unmachined is marked on the pattern by
Red colour
Yellow colour
Black colour
Blue colour
Tandem drawing of wires and tubes is necessary because
It is not possible to reduce at one stage
Annealing is needed between stages
Accuracy in dimensions is not possible otherwise
Surface finish improves after every drawing stage
According to Indian standard specifications, 100 H6/g 5 means that.
Basic size is 100 mm
Actual size is 100 mm
Difference between the actual size and basic size is 100 mm
None of the above
For arc welding
Alternating current with high frequency is used
Alternating current with low frequency is used
Direct current is used
Any one of these
The maximum flame temperature occurs
At the outer cone
At the inner cone
Between the outer and inner cone
At the torch tip
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 upsetting is a process of
Increasing the cross-section of a bar
Reducing the cross-section of a bar
Joining the two surfaces of metal under pressure after heating
Bending of a bar
The temperature at which the new grains are formed in the metal is called
Lower critical temperature
Upper critical temperature
Eutectic temperature
Recrystallisation temperature
Cores are used to
Form internal cavities in the casting
Improve mould surface
Form a part of a green sand mould
All of these
The minimum size of a bloom is
5 cm × 5 cm
10 cm × 10 cm
15 cm × 15 cm
20 cm × 20 cm
The operation of cutting a sheet of metal in a straight line along the length, is known as
Plunging
Notching
Slitting
Forming
A casting defect which occurs due to improper venting of sand is known as
Cold shuts
Blow holes
Shift
Swell
The casting method adopted for ornaments and toys of nonferrous alloys, is
Permanent mould casting
Slush casting
Die casting
Centrifugal casting