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
D. Twisting moment of both the shafts is same
p.d.σt
p.t.σt
(p - d) σt
(p - d) t.σt
Combined effect of transverse shear stress and bending stress in the wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Be across threaded portion of shank
Be parallel to axis of bolt
Be normal to threaded portion of shank
Never be across the threaded portion
d = t
d = 1.6 t
d = 2t
d = 6t
Normalising
Full annealing
Process annealing
Spheroidising
5 N-m
7 N-m
10 N-m
15 N-m
Material of belt
Material of pulley
Materials of belt and pulley
Belt velocity
Very serious in brittle materials and less serious in ductile materials
Very serious in ductile materials and less serious in brittle materials
Equally serious in both types of materials
Seriousness would depend on other factors
Bending moment only
Twisting moment only
Combined bending moment and twisting moments
Combined action of bending moment, twisting moment and axial thrust
M6
M8
M6 - 8d
M8 - 6d
Directly proportional to (shaft diameter)²
Inversely proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)⁴
10
15
20
25
Ductile materials
Brittle materials
Equally serious in both cases
Depends on other factors
Free from corrosion
Stronger in tension
Free from stress
Leak-proof
Both the ends fixed
Both the ends hinged
One end fixed and the other end hinged
One end fixed and the other end free
Have contact at the bottom most of the bearing
Move towards right of the bearing making no metal to metal contact
Move towards right of the bearing making the metal to metal contact
Move towards left of the bearing making metal to metal contact
Butt joint with single cover plate
Butt joint with double cover plate
Lap joint with one ring overlapping the other
Any one of the above
F/bh
3F/2bh
2F/bh
4F/bh
80 kN/mm²
100 kN/mm²
110 kN/mm²
210 kN/mm²
Determining brittleness
Protecting metal against corrosion
Protecting metal against wear and tear
Experimental stress analysis
Cold working
Shot peening
Grinding and lapping surface
Hot working
1/2
1/3
1/4
2/3
Hydrostatic lubricated bearing
Hydrodynamic lubricated bearing
Boundary lubricated bearing
Zero film bearing
Lower critical temperature
Upper critical temperature
Recrystallisation temperature
None of these
The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy
If Ixx > 4 Iyy, the buckling will occur about Y-axis
If Ixx < 4 Iyy, the buckling will occur about X-axis
The most suitable section for the connecting rod is T-section
10° to 15°
15° to 20°
20° to 35°
35° to 50°
Joint may not open up
Bolts are weakest elements
The resultant load on the bolt would not be affected by the external cyclic load
Bolts will not loosen during service
Helical compression spring
Spiral spring
Torsion spring
Belleville spring
Dynamic loading
Static loading
Combined static and dynamic loading
Completely reversed loading
Same in both cases
2 times more
3 times more
4 times more