Gd⁴/ 8D3n
Gd3/ 8D3n
Gd⁴/ 4D3n
Gd⁴/ 8D²n
A. Gd⁴/ 8D3n
Jam nut
Castle nut
Sawn nut
Ring nut
Pulley is made the weakest
Key is made the weakest
Key is made the strongest
All the three are designed for equal strength
Thickness of plates to be riveted
Length of rivet
Diameter of head
Nominal diameter
To produce torque
For speed reduction
To obtain variable speeds
To increase efficiency of system
Transmission
Machine
Machine frame
None of these
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
Load lifted to the effort applied
Mechanical advantage to the velocity ratio
Load arm to the effort arm
Effort arm to the load arm
Along the axis of rotation
Parallel to the axis of rotation
Perpendicular to the axis of rotation
In any direction
Are lighter in weight
Offer silent operation
Can withstand shock loads
All of these
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
Effective length of column to least radius of gyration of the column
Width of column to depth of column
Maximum size of column to minimum size of column
Effective length of column to width of column
Plastic materials
Brittle materials
Non-ferrous materials
Ductile materials
Circular pitch
Diametral pitch
Module
None of these
An axial compressive force
A tangential force
An axial tensile force
Any one of these
Pitch circle diameter × cosφ
Addendum circle diameter × cosφ
Clearance circle diameter × cosφ
Pitch circle diameter × sinφ
Is less flexible
Has a much smaller load carrying capacity
Does not provide much warning before failure
Provides much greater time for remedial action before failure
(Sum of base circle radii)/cosφ
(Difference of base circle radii)/cosφ
(Sum of pitch circle radii)/cosφ
(Difference of pitch circle radii)/cosφ
More
Less
Same
More or less depending on quantum of load
Increases
Decreases
Remains constant
None of these
Helix angle
Pressure angle
Pitch lead angle
None of these
0.4 times
0.6 times
0.7 times
0.8 times
Module
Tooth profile
Both module and pitch line velocity
Pitch line velocity
Length of arc of recess to the circular pitch
Length of path of contact to the circular pitch
Length of arc of contact to the circular pitch
Length of arc of approach to the circular pitch
Axial load only
Both radial and axial loads and the ratio of these being greater than unity
Radial load only
Both radial and axial loads and the ratio of these being less than unity
(1 - sinφ)/ (1 + sinφ)
(1 + sinφ)/ (1 - sinφ)
(1 - sinφ)/ (1 + cosφ)
(1 + cosφ)/ (1 - sinφ)
(k₁ k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ + k₂)
(k₁ + k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ k₂)
They are cheap
They can work at high temperature
They are unaffected by moisture and humidity
None of the above
Material of the belt
Material of the pulley
Uneven extensions and contractions due to varying tension
All of the above
Ductile materials
Brittle materials
Equally serious in both cases
Depends on other factors
Right hand threads on bout ends
Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
No threads