According to Indian standards, the total numbers of tolerance grades are
8
12
18
20
Correct Answer :
C. 18
Related Questions
In arc welding, the electric arc is produced between the work and the electrode by
Voltage
Flow of current
Contact resistance
All of these
In a cold chamber die casting machine
Melting pot is separate from the machine
Melting pot is an integral part of the machine
Melting pot may have any location
Low temperature and pressure is used
The temperature of the inner luminous cone of neutral flame is about
1000°C
1250°C
2100°C
3200°C
Seam welding is a
Continuous spot welding process
Multi-spot welding process
Arc welding process
Process used for joining round bars
In order to deliver molten metal from pouring basin to gate, a ________ is used.
Riser
Sprue
Core
None of these
In backhand welding, the angle between the welding torch and the work is kept as
30°-40°
40°-50°
50°-60°
60°-70°
In ________ welding, the weld may be made either from left to right or from right to left.
Forehand
Backhand
Vertical
None of these
An oxidising process used for aluminium and magnesium articles is called
Galvanising
Anodising
Parkerising
Sherardizing
A basic shaft is one whose
Lower deviation is zero
Upper deviation is zero
Lower and upper deviations are zero
None of these
In backhand welding, the angle between the welding rod and the work is ________ as compared to forehand welding.
Same
Less
More
None 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
The algebraic difference between the maximum limit and the basic size is called
Actual deviation
Upper deviation
Lower deviation
Fundamental deviation
The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as
Hot piercing
Extrusion
Cold peening
Cold heading
Cutting and forming operations can be performed in a single operation in a
Simple die
Progressive die
Compound die
Combination die
Projection welding is a
Continuous spot welding process
Multi-spot welding process
Arc welding process
Process used for joining round bars
Sand wash is a casting defect which
Results in a mismatching of the top and bottom parts of a casting
Results in general enlargement of the casting
Occurs near the ingates as rough lumps on the surface of a casting
Occurs as sand patches on the upper surface of a casting
For cutting brass, the hacksaw blade should have __________ teeth per 25 mm.
14
24
32
40
The temperature at which the new grains are formed in the metal is called
Lower critical temperature
Upper critical temperature
Eutectic temperature
Recrystallisation temperature
For gas welding, the pressure desired at the welding torch for oxygen is
7 to 103 kN/m²
70 to 280 kN/m²
280 to 560 kN/m²
560 to 840 kN/m²
Which one of the following material will require the largest size of riser for the same size of casting?
Aluminium
Cast iron
Steel
Copper
The metal patterns as compared to wooden patterns require less
Shrinkage allowance
Machining allowance
Draft allowance
Distortion allowance
The electron beam welding can be carried out in
Open air
A shielded gas environment
Vacuum
A pressurised inert gas chamber
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
Lap joints are employed on plates having thickness
Less than 3 mm
5 to 10 mm
12.5 mm
Above 25 mm
The sand used for making cores is
Green sand
Dry sand
Loam sand
Oil sand
The operation of straightening a curved sheet metal, is known as
Drawing
Squeezing
Coining
Planishing
In spot welding, the spacing between two spot weld should not be less than
d
1.5 d
3 d
6 d
In a bilateral system of tolerance, the tolerance is allowed on
One side of the actual size
One side of the nominal size
Both sides of the actual size
Both sides of the nominal size
The punch and die set up is ________ for punching and piercing operation.
Same
Similar
Different
None of these
A casting defect which results in general enlargement of a casting is known as
Shift
Sand wash
Swell
Scab