ObjectiveMcq
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The heavier oxide films are removed by using?
Emery
Basic flux
Neutral flux
Organic solvents
Oxide films should be removed before welding. Heavier oxide films may be removed by acid pickling, emery or by wire brusing.
Which of the following does not require fluxes to eliminate the oxides present in them?
Mild steel
Copper
Aluminium
Magnesium
Mild steel does not require flux to eliminate the oxides, due to the fact that iron oxide has relatively low melting point when compared to other non-ferrous metals given.
The oil substances are removed from the interface by using which of the following organic solvent?
Carbon tetrachloride
Ethylene glycol
Acetone
Acetone & Carbon tetrachloride
Both acetone and carbon tetrachloride are used to remove the oil substances from the interface.
Which of the following is a type of welding joint?
Tee joint
Lap joint
Corner joint
All of the Mentioned
No explanation is available for this question yet.
In welding the strength of the joint piece could be?
Is lesser than the parent metal
Equal to that of parent metal
Equal or Greater than that of parent metal
Greater than that of parent metal
The strength of perfectly welded joint is more than the parent metal, due to the formation of alloy. The alloy formation at the welded portion makes it the strongest portion while the nearby zones where uncontrolled cooling take place because of heat is the weakest zone (heat affected zone). In general we can say that on the basis of strength: welded portion > parent material > heat affected zone.
In welding, two parts are joined by bringing them to a temperature of?
Equal to melting point temperature
Above melting point temperature
Equal to Curie temperature
Below melting point temperature
In welding one needs to melt the base metals to fuse them.
Which of the following process involves metallurgical fusion?
Forming
Extrusion
Welding
Forging
Welding joins metals by melting and fusing them together, typically with the addition of a welding filler metal.
For a given pair of mating gear, arc of contact is 6mm and a circular pitch is 4 mm. Contact ratio is equal to
4.75
6.32
3.20
1.50
Contact ratio = arc of contact/circular pitch.
Working depth of two mating gear is numerically equal to
Difference of addendum of two gears
Sum of dedendum of two gears
Difference of dedendum of two gears
Sum of addendum of two gears
Working depth of two mating gear is numerically equal to sum of the addendum of two gears.
Full depth of teeth is equal to
Addendum – dedendum
Addendum / dedendum
Addendum + dedendum
Addendum * dedendum
Full depth is the sum of addendum and dedendum.
Maximum depth to which tooth can penetrate into the tooth space of mating gear is known as
Space width
Full depth of teeth
Working depth of teeth
Clearance
Maximum depth to which tooth can penetrate into the tooth space of mating gear is known as working depth of teeth.
Total radial depth of tooth space is known as
Clearance
Space width
Working depth of teeth
Full depth of teeth
Total radial depth of tooth space is known as full depth of teeth.
Standard value of clearance is generally taken as
1.157 module
0.157 module
2 module
1 module
Clearance of gear is generally taken equal to 0.157 modules.
Radial difference between addendum and dedendum of tooth is known as
Working depth of teeth
Clearance
Full depth of teeth
Space width
Clearance is the radial difference between addendum and dedendum of tooth.
Standard value of dedendum is generally taken as
0.157 module
2 module
1.157 module
1 module
Dedendum of gear is generally taken equal to 1.157 modules.
Radial depth of tooth below pitch circle is known as
Addendum circle
Addendum
Dedendum
Dedendum circle
Dedendum is the radial depth of tooth below pitch circle.
Circle passing through root of teeth is known as
Addendum
Addendum circle
Root circle
Dedendum
Circle passing through the root of teeth is known as root circle.
Circle passing through root of teeth is known as
Addendum circle
Dedendum circle
Addendum
Dedendum
Circle passing through the root of teeth is known as dedendum circle.
Addendum of gear is generally taken equal to
0.157 module
1.157 module
2 module
1 module
Addendum of gear is generally taken equal to 1 module.
Height of tooth above pitch circle is known as
Dedendum
Addendum circle
Addendum
Dedendum circle
Addendum is the height of tooth above pitch circle.
