Square
Acme
Buttress
BSW
C. Buttress
Gib of cotter joint
Sleeve and cotter joint
Spigot socket cotter joint
Knuckle joint
Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Directly proportional to the applied torque and the polar moment of inertia
Inversely proportional to the applied torque and the polar moment of inertia
Increasing velocity ratio
For applying tension
Changing the direction of motion of belt
All of these
Helical spring
Conical spring
Flat spiral spring
Volute spring
d
1.5 d
2.5 d
2 d
Low efficiency
High efficiency
Very fine threads
Strong teeth
14 ½° composite and full depth involute system
20° full depth involute system
20° stub system
None of the above
Larger
Smaller
Equal
Larger/smaller depending on diameter of spring coil
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
Crown bevel gears
Angular bevel gears
Mitre gears
Internal bevel gears
8
12
18
20
Same
Coarser
Finer
Very fine
3 mm
5 mm
10 mm
20 mm
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 is middle of nut and then slot reduced by tightening a 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 spitted and bent in reverse direction at other end
Strong in buckling about X-axis
Strong in buckling about Y-axis
Equally strong in buckling about X-axis and Y-axis
Any one of the above
Be across threaded portion of shank
Be parallel to axis of bolt
Be normal to threaded portion of shank
Never be across the threaded portion
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
Long column
Short column
Short and long column
Very long column
Increases markedly
Decreases markedly
Remain same
Depends on heat treatment carried out
Increasing its shank diameter
Decreasing its shank diameter
Tightening the bolt properly
Making the shank diameter equal to core diameter of thread
29°
55°
47.3°
60°
120°
180°
270°
360°
Stiffness
Ductility
Resilience
Plasticity
Heavy thrust load only
Small angular displacement of shafts
Radial load at high speed
Combined thrust and radial loads at high speed
4430 mm as diameter of small pulley
4430 mm as nominal pitch length
4430 mm as diameter of large pulley
4430 mm as centre distance between pulleys
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
Short bearing
Long bearing
Medium bearing
Square bearing
Jam nut
Castle nut
Sawn nut
Ring nut
Master leaf
Lower leaf
Upper leaf
None of these
Both the ends fixed
Both the ends hinged
One end fixed and the other end hinged
One end fixed and the other end free