1/sinθ
1/cosθ
1/tanθ
sinθ cosθ
B. 1/cosθ
Very fine threads
High efficiency
Low efficiency
Strong teeth
Finishing and polishing
Shotpeening
De-carburisation
Electroplating
0.1 and 0.25
0.25 and 0.50
0.50 and 0.75
0.75 and 1
Module
Tooth profile
Both module and pitch line velocity
Pitch line velocity
Base circle
Pitch circle
Addendum circle
Dedendum circle
Master leaf
Lower leaf
Upper leaf
None of these
12
14
18
24
The strength of the shaft
The rigidity of the shaft
Both the strength and rigidity of the shaft
The ductility of the shaft
To reduce friction
To facilitate slipping of balls
To prevent the lubricant from flowing out
To maintain the balls at a fixed distance apart
Metal strength by cycling
Metal hardness by surface treatment
Metal resistance to corrosion by coating
Fatigue limit by overstressing the metal by successively increasing loadings
Flaring
Brazing
Soft soldering
Fusion welding
Dun cylinder
Hollow shaft
Solid shaft
Thick cylinder
Bolt
Tap bolt
Stud
None of these
0.75/ (0.75 + √v)
3/ (3 + v)
4.5/ (4.5 + v)
6/ (6 + v)
Nickel
Chromium
Nickel and chromium
Cobalt and molybdenum
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for both the straps on the inside and outside
0.625 t for both the straps on the inside and outside
Brittle when cold
Brittle when hot
Brittle under all conditions
Ductile at high temperature
A key is used as a temporary fastening
A key is subjected to tensile stresses
A key is always inserted parallel to the axis of the shaft
A key prevents relative motion between the shaft and boss of the pulley
Low carbon steel
High carbon steel
Medium carbon steel
High speed steel
Cold working
Shot peening
Surface decarburisation
Under stressing
Tensile stress
Compressive stress
Shear stress
Bending stress
Maximum at the outer surface and minimum at the inner surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the inner surface and zero at the outer surface
Maximum at the outer surface and zero at the inner surface
(Kf + 1)/ (Kt + 1)
(Kf - 1)/ (Kt - 1)
(Kt + 1)/ (Kf + 1)
(Kt - 1)/ (Kf - 1)
0.20
0.35
0.50
0.65
Equal to
Less than
Greater than
None of these
Circular pitch
Diametral pitch
Module
None of these
Is directly proportional to
Is inversely proportional to
Is equal to cos φ multiplied by
Does not depend upon
Same
Higher
Lower
Depends on other factors
d
1.5 d
2.5 d
2 d
One-fourth
One-third
One-half
Double