They are cheap
They can work at high temperature
They are unaffected by moisture and humidity
None of the above
A. They are cheap
Screw cutting lathes
Feed mechanisms
Spindles of bench vices
Railway carriage couplings
Maximum at the outer surface and minimum at the inner surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the inner surface and zero at the outer surface
Maximum at the outer surface and zero at the inner surface
Above
Below
At
None of these
Best method
Extremely hazardous
Has no effect as regards fatigue strength
Cheapest method
Guest's theory
Rankine's theory
St Venant's theory
Von Mises theory
Dun cylinder
Hollow shaft
Solid shaft
Thick cylinder
4F/ πd²
6F/ πd²
8F/ πd²
16F/ 3πd²
Same
Higher
Lower
None of these
An axial compressive force
A tangential force
An axial tensile force
Any one of these
Acts when external load is applied
Becomes zero when external load is removed
Is independent of external loads
Is always harmful
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and the plane of rotation
The angle between the tangent to the pitch helix and an element of the cylinder
None of the above
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
Yes
No
Sometimes
Rarely
Elastic limit to the working stress
Elastic limit to the yield point
Endurance limit to the working stress
Young's modulus to the ultimate tensile strength
Varies linearly
Is uniform throughout
Varies exponentially, being more near the torque-input end
Varies exponentially, being less near the torque-input end
Shear stress in each spring will be equal
Load taken by each spring will be half the total load
Only A is correct
Both A and B is correct
Outer diameter
Hole diameter
Thickness
Mean diameter
1 in 16
1 in 32
1 in 48
1 in 100
Decreasing the cross-section area of bar
Increasing the cross-section area of bar
Remain unaffected with cross-section area
Would depend upon other factors
A key is used as a temporary fastening
A key is subjected to tensile stresses
A key is always inserted parallel to the axis of the shaft
A key prevents relative motion between the shaft and boss of the pulley
Helical spring
Conical spring
Flat spiral spring
Volute spring
Does not change
Increases
Decreases
None of the Above
4
6
8
10
Decrease the tendency of belt to slip
Increase the power transmission capacity
Increase the wrap angle and belt tension
All the above objectives
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
Brittle
Ductile
Elastic
Plastic
Regain its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force
Resist fracture due to high impact loads
Retain deformation produced under load permanently
Intersecting and the teeth are curved
Non-intersecting and nonparallel and the teeth are curved
Non-intersecting and non-parallel and the teeth are straight
None of the above
Square threads
Multiple threads
Acme threads
Buttress threads
Friction angle is less than helix angle
Friction angle is more than helix angle
Friction angle is equal to helix angle
Efficiency of screw is 100%