p.d.σc
p.t.σc
n.d.t.σc
(p - d) t.σc
C. n.d.t.σc
Guest's theory
Rankine's theory
St Venant's theory
Von Mises theory
Crimped
Honed
Flared
Bent
Brown colour
Yellow colour
White colour
Grey colour
Metric
Buttress
Square
NPT (national pipe threads)
3 mm
5 mm
10 mm
20 mm
Tensile stress
Compressive stress
Direct shear stress
Torsional shear stress
Bolts and nuts
Studs
Headless taper bolts
None of these
1 in 16
1 in 32
1 in 48
1 in 100
Square threads
Multiple threads
Acme threads
Buttress threads
First type
Second type
Third type
Any one of these
Gib of cotter joint
Sleeve and cotter joint
Spigot socket cotter joint
Knuckle joint
In decreasing the slip of the belt
In increasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion
To increase pulley life
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
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
The belt should touch the bottom of groove in the pulley
The belt should not touch the bottom of groove in the pulley
The belt should not touch the sides of groove in the pulley
None of the above
Elastic limit
Strain
Factor of safety
Bulk modulus
T sec3φ
T sec²φ
T/sec3φ
T cosecφ
Spindles of bench vices
Railway carriage couplings
Feed mechanism of machine tools
Screw cutting lathes
Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Its capability of storing energy
Its ability to absorb shocks
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
Very fine threads
High efficiency
Low efficiency
Strong teeth
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
Tensile stress
Compressive stress
Shear stress
None of these
Ductile materials
Brittle materials
Equally serious in both cases
Depends on other factors
120°
180°
270°
360°
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
Yes
No
Sometimes
Rarely
Spindles of bench vices
Railway carriage couplings
Feed mechanism of machine tools
Screw cutting lathes
For conveying steam
In water and sewage systems
In pressure lubrication systems on prime movers
All of the above
p = D sin (90°/T)
p = D sin (120°/T)
p = D sin (180°/T)
p = D sin (360°/T)