Maximum principal stress theory
Maximum shear stress theory
Maximum strain energy theory
Maximum distortion energy theory
A. Maximum principal stress theory
Always in single shear
Always in double shear
Either in single shear or double shear
Any one of these
Free from corrosion
Stronger in tension
Free from stress
Leak-proof
1 : 1
2 : 1
3 : 2
2 : 3
Brittle
Ductile
Elastic
Plastic
Initial tension
External load applied
Sum of the initial tension and external load applied
Initial tension or external load, whichever is greater
Foundation purposes
Absorbing shock and vibrations
Transmission of power
Lifting and transportation of machines and cubicles
Tensile stress
Bending stress
Bearing stress
Shear stress
Be independent of ratio of mass of load W to mass of bar (y)
Increase with increase in y
Decrease with decrease in y
Depend on other considerations
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
Direction of twist of wires in strands is opposite to the direction of twist of strands
Direction of twist of wires and strands are same
Wires in two adjacent strands are twisted in opposite direction
Wires are not twisted
Muff coupling
Compression coupling
Flange coupling
All of these
Heavier
Lighter
Moderate
None of these
7.5 kN
10.6 kN
15 kN
22.5 kN
Increasing velocity ratio
For applying tension
Changing the direction of motion of belt
All of these
2WD3n/Gd⁴
4WD3n/Gd⁴
8WD3n/Gd⁴
16WD3n/Gd⁴
Axial load plus stress due to bending
Acceleration/retardation of masses plus stress due to bending
Axial load plus stress due to acceleration/retardation
Bending plus stress due to acceleration/retardation
Same
Double
One-half
One-fourth
Normal pitch
Axial pitch
Diametral pitch
Module
Axially upwards
Axially downwards
Axially upwards or downwards
None of these
Tightening it properly
Increasing shank diameter
Grinding the shank
Making shank diameter equal to core diameter of thread.
0.45
0.55
0.65
0.75
Directly as load
Inversely as square of load
Inversely as cube of load
Inversely as fourth power of load
Electroplating
Polishing
Coating
Shot peening
εc + 2εl
2εc + εl
εc + εl²
εc² + εl
Surface of the top of the tooth
Surface of the tooth above the pitch surface
Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Plasticity
Elasticity
Ductility
Malleability
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 required to be applied after some intervals
40°
122°
136°
152°
Increases
Decreases
Remains unchanged
None of these
Heavy thrust load only
Small angular displacement of shafts
Radial load at high speed
Combined thrust and radial loads at high speed