√2P/s.l
P/2.s.l
P/√2.s.l
2P/s.l
C. P/√2.s.l
Porosity of the metal is largely eliminated
Grain structure of the metal is refined
Mechanical properties are improved due of refinement of grains
All of the above
Handle of a hand pump
Hand wheel of a punching press
Lever of a loaded safety valve
A pair of tongs
Diameter of both the shafts is same
Angle of twist of both the shafts is same
Material of both the shafts is same
Twisting moment of both the shafts is same
Increasing its shank diameter
Increasing its length
Decreasing its shank diameter
Decreasing its length
l/2
l/√2
l
2 l
Elastic limit
Strain
Factor of safety
Bulk modulus
(π/4) d² × τ × n
1.875 × (π/4) d² × τ × n
2 × (π/4) d² × τ × n
3 × (π/4) d² × τ × n
1420 d
1680 d
2080 d
2840 d
Equal to
sinα times more than
sinα times less than
cosecα times more than
εc + 2εl
2εc + εl
εc + εl²
εc² + εl
Less than
Equal to
More than
None of these
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Ductile material
Brittle material
Elastic material
Hard material
Cast iron
Wrought iron
Mild steel
Aluminium
Bolted joint
Knuckle joint
Cotter joint
Universal joint
Woodruff key
Feather key
Flat saddle key
Gib head key
Bolt
Tap bolt
Stud
None of these
14 ½° composite and full depth involute system
20° full depth involute system
20° stub system
None of the above
(1 - sinφ)/ (1 + sinφ)
(1 + sinφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + cosφ)
(1 + cosφ)/ (1 - sinφ)
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between parts
Similar to stud
The Oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant
Grease is used for lubrication
Pt /P
Ps /P
Pc /P
Least of Pt, Ps and Pc/P
Low carbon steel
High carbon steel
Medium carbon steel
High speed steel
They are cheap
They can work at high temperature
They are unaffected by moisture and humidity
None of the above
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
None of the above
W/2
2W/3
W/9
8W/9
Right hand threads on bout ends
Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
No threads
On both the sides
On one side only
On none of the sides
May be provided anywhere
Cotter joint
Bolted joint
Knuckle joint
Universal coupling
Both sides of the actual size
One side of the actual size
One side of the nominal size
Both sides of the nominal size