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
A. Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
10°
20°
30°
45°
Pitch diameter
Inside diameter
Outside diameter
Height
8
12
18
20
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
10
15
20
25
Heavy load
Loose belt
Driving pulley too small
Any one of the above
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 two parts
Similar to stud
Tensile strength
Compressive strength
Shear strength
Bending strength
Larger
Smaller
Equal
Larger/smaller depending on diameter of spring coil
Shoe brake
Band and block brake
Band brake
Internal expanding brake
Normalising
Full annealing
Process annealing
Spheroidising
Normal pitch
Axial pitch
Diametral pitch
Module
Addendum circle
Dedendum circle
Pitch circle
Clearance circle
Tightening it properly
Increasing shank diameter
Grinding the shank
Making shank diameter equal to core diameter of thread.
Compression
Tension
Shear
Combined loads
Metric
Buttress
Acme
Square
Guest's theory
Rankine's theory
St Venant's theory
Von Mises theory
Nil or lightest
Maximum
Average
Any one of the above
(k₁ k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ + k₂)
(k₁ + k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ k₂)
Repeated stress
Yield stress
Fluctuating stress
Alternating stress
d
1.25 d
1.5 d
1.75 d
Hollow saddle key
Hollow key
Soft key
None of these
εc + 2εl
2εc + εl
εc + εl²
εc² + εl
Woodruff key
Feather key
Flat saddle key
Hollow saddle key
Only the broken belt is replaced
The entire set of belts is replaced
The broken belt and the belt on either side of it, is replaced
The broken belt need not to be replaced
Diameter of bolt
0.75 × diameter of bolt
1.25 × diameter of bolt
1.5 × diameter of bolt
0.75/ (0.75 + √v)
3/ (3 + v)
4.5/ (4.5 + v)
6/ (6 + v)
F/bh
3F/2bh
2F/bh
4F/bh
Mild steel
High speed steel
Stainless steel
Aluminium
Belt velocity
Initial belt tension
Arc of contact
All of the above