Watts mechanism
Grasshopper mechanism
Roberts mechanism
Peaucelliers mechanism
D. Peaucelliers mechanism
Vector sum of radial component and coriolis component
Vector sum of tangential component and coriolis component
Vector sum of radial component and tangential component
Vector difference of radial component and tangential component
Varies in magnitude but constant in direction
Varies in direction but constant in magnitude
Varies in magnitude and direction both
Constant in magnitude and direction both
Difference of minimum fluctuation of speed and the mean speed
Difference of the maximum and minimum speeds
Sum of maximum and minimum speeds
Variations of speed above and below the mean resisting torque line
Dedendum
Addendum
Clearance
Working depth
Minimise the effect of primary forces
Minimise the effect of secondary forces
Have perfect balancing
To start the locomotive quickly
Mass
Stiffness
Mass and stiffness
Stiffness and eccentricity
The reaction on me inner wheels increases and on the outer wheels decreases
The reaction on the outer wheels increases and on the inner wheels decreases
The reaction on the front wheels increases and on the rear wheels decreases
The reaction on the rear wheels increases and on the front wheels decreases
Leads the sliding velocity vector by 90°
Lags the sliding velocity vector by 90°
Is along the sliding velocity vector
Leads the sliding velocity vector by 180°
Four bar linkage
6 bar linkage
8 bar linkage
3 bar linkage
(1/2) μ W (r₁ + r₂)
(2/3) μ W (r₁ + r₂)
(1/2) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
(2/3) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
Bulky
Wears rapidly
Difficult to manufacture
Both (A) and (B) above
Watt's mechanism
Grasshopper mechanism
Robert's mechanism
All of these
2 W CE / CS
W CE / 2CS
W CE / CS
W CS / 2CE
2 links
3 links
4 links
5 links
Slow speed
Moderate speed
Highs peed
Any one of these
0° and 90°
180° and 360°
Both (A) and (B)
None of these
Positive throughout
Negative throughout
Positive during major portion of the stroke
Negative during major portion of the stroke
θ/2
θ
2θ
4θ
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Varies as the square root of the speed
Varies inversely with the square of the speed
Two links
Three links
Four or more than four links
All of these
Damping factor
Damping coefficient
Logarithmic decrement
Magnification factor
Toothed gearing
Belt and rope drive
Ball and roller bearing
All of these
ω² R cosθ
ω² (R - r₁) cosθ
ω² (R - r₁) sinθ
ω² r₁ sinθ
A single plane
Two planes
Three planes
Four planes
Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically
Two elements that permit relative motion
Static friction
Dynamic friction
Limiting friction
Coefficient of friction
Pendulum type governor
Dead weight governor
Spring loaded governor
Inertia governor
m/(m + M)
M/(m + M)
(m + M)/m
(m + M)/M
Mean speed to the maximum equilibrium speed
Mean speed to the minimum equilibrium speed
Difference of the maximum and minimum equilibrium speeds to the mean speed
Sum of the maximum and minimum equilibrium speeds to the mean speed
Cylindrical pair
Turning pair
Rolling pair
Sliding pair