Woodruff key
Feather key
Flat saddle key
Hollow saddle key
A. Woodruff key
Uniform velocity
Simple harmonic motion
Uniform acceleration and retardation
Cycloidal motion
The efficiency of a self locking screw can not be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
(A) and (B) Only
340 to 360
420 to 450
More than 400
300 to 320
Angular bevel gears
Mitre gears
Internal bevel gears
Crown bevel gears
Bending moment only
Twisting moment only
Combined bending moment and twisting moments
Combined action of bending moment, twisting moment and axial thrust
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
Ductile materials
Brittle materials
Equally serious in both cases
Depends on other factors
Porosity of the metal is largely eliminated
Grain structure of the metal is refined
Mechanical properties are improved due of refinement of grains
All of the above
Varies linearly
Is uniform throughout
Varies exponentially, being more at the torque-input end
Varies exponentially, being less at the torque-input end
Tensile stress
Compressive stress
Shear stress
None of these
1
1/π
π
π × number of teeth
The pitch of the thread is 24 mm and depth is 2 mm
Cross-sectional area of the threads is 24 mm²
The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
There is a thick film of lubricant between the journal and the bearing
There is a thin film of lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is no lubricant between the journal and the bearing
White metal
Silicon bronze
Monel metal
Phosphor bronze
90° - φ
45° - φ
45° - φ/2
45° + φ/2
Long column
Short column
Short and long column
Very long column
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
Low
High
Medium
None of these
Transmission
Machine
Machine frame
None of these
Cast iron
Wrought iron
Mild steel
Aluminium
0.33
0.4
0.5
0.55
Increasing the initial tension in the belt
Dressing the belt to increase the coefficient of friction
Increasing wrap angle by using idler pulley
All of the above methods
σ [1 + (b/2a)]
σ [1 + (2a/b)]
σ [1 + (b/3a)]
σ [1 + (3a/b)]
Butt joint with single cover plate
Butt joint with double cover plate
Lap joint with one ring overlapping the other
Any one of the above
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
(Sum of base circle radii)/cosφ
(Difference of base circle radii)/cosφ
(Sum of pitch circle radii)/cosφ
(Difference of pitch circle radii)/cosφ
Constant period
Fixed period
Dwell period
Idle period
In a direction perpendicular to the cam axis
In a direction parallel to the cam axis
In any direction irrespective of cam axis
Along the cam axis
Woodruff key
Feather key
Flat saddle key
Gib head key
K
K/2
2K
K/4