Woodruff key
Feather key
Flat saddle key
Gib head key
C. Flat saddle key
3.6 N/mm² compression
3.6 N/mm² tension
7.2 N/mm² compression
7.2 N/mm² tension
40°
122°
136°
152°
8
6
4
10
Hot piercing
Extrusion
Cold peening
Cold heading
Directly proportional to (shaft diameter)²
Inversely proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)⁴
One-eighth
One-fourth
One-half
Double
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly in middle of nut and then slot reduced by tightening screw
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end
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
Ductile materials
Brittle materials
Equally serious in both cases
Depends on other factors
1-3 m/s
3-15 m/s
15-30 m/s
30-50 m/s
0.124 - (0.684/T)
0.154 - (0.912/T)
0.175 - (0.841/T)
None of these
√2P/s.l
P/2.s.l
P/√2.s.l
2P/s.l
29°
55°
47.3°
60°
10
15
20
25
Reducing stress concentration
Ease of manufacture
Safety
Fullering and caulking
Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Its capability of storing energy
Concerned with strength of wire of spring
A parallel sunk key is a taperless key
A parallel sunk key may be rectangular or square in cross-section
A flat saddle key is a taper key which fits in a key way of the hub and is flat on the shaft
All of the above
Increases
Decreases
Remain same
None of these
(Kf + 1)/ (Kt + 1)
(Kf - 1)/ (Kt - 1)
(Kt + 1)/ (Kf + 1)
(Kt - 1)/ (Kf - 1)
Increases linearly
Decreases linearly
Remains same
Increases exponentially
Self locking bolts
Designed for shock load
Used in aircraft application
Provided with hexagonal depression in head
Parallel
Perpendicular
Both A and B
None of these
Bolted joint
Knuckle joint
Cotter joint
Universal joint
Major diameter
Minor diameter
Pitch diameter
Core diameter
Measure forces
Apply forces
Store energy
All of these
Addendum
Dedendum
Clearance
Working depth
Have same value as that of standard specimen
Increase
Decrease
None of these
0.75/ (0.75 + √v)
3/ (3 + v)
4.5/ (4.5 + v)
6/ (6 + v)
Pulley is made the weakest
Key is made the weakest
Key is made the strongest
All the three are designed for equal strength
Increasing its shank diameter
Decreasing its shank diameter
Tightening the bolt properly
Making the shank diameter equal to core diameter of thread