In increasing velocity ratio
In decreasing the slip of the belt
For automatic adjustment of belt position so that belt runs centrally
Increase belt and pulley life
C. For automatic adjustment of belt position so that belt runs centrally
On their point of contact
At the centre of curvature
At the centre of circle
At the pin joint
Damping factor
Damping coefficient
Logarithmic decrement
Magnification factor
Longitudinal vibration
Torsional vibration
Transverse vibration
Damped free vibration
sin (θ + φ) + 1/ cos (θ - φ) + 1
cos (θ - φ) + 1/ sin (θ + φ) + 1
cos (θ + φ) + 1/ cos (θ - φ) + 1
cos (θ - φ) + 1/ cos (θ + φ) + 1
2π. √(g/l)
(1/2π). √(g/l)
2π. √(l/g)
(1/2π). √(l/g)
Fluctuation of speed
Maximum fluctuation of speed
Coefficient of fluctuation of speed
None of these
0° and 90°
90° and 180°
135° and 315°
270° and 360°
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
D/T
T/D
2D/T
2T/D
Have a surface contact when in motion
Have a line or point contact when in motion
Are kept in contact by the action of external forces, when in motion
Permit relative motion
All points of the disc have the same velocity
The centre of the disc has zero acceleration
The centre of the disc has centrifugal acceleration
The point on the disc making contact with the plane surface has zero acceleration
Input link and coupler
Input link and fixed link
Output link and coupler
Output link and fixed link
At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
The two rigid links have no linear velocities relative to each other at the instantaneous centre
The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
The double centre can be denoted either by O2 or O12, but proper selection should be made
The mass of two are same
C.G. of two coincides
M.I. of two about an axis through e.g. is equal
All of the above
Each of the four pairs is a turning pair
One is a turning pair and three are sliding pairs
Two are turning pairs and two are sliding pairs
Three are turning pairs and one is a sliding pair
Hammer blow
Swaying couple
Variation in tractive force along the line of stroke
All of the above
Inner dead centre
Outer dead centre
Right angles to the link of the stroke
All of the above
0.25
0.5
1
2
Bolt and nut
Lead screw of a lathe
Ball and socket joint
Ball bearing and roller bearing
The interference is inherently absent.
The variation in centre distance of shafts increases radial force.
A convex flank is always in contact with concave flank.
The pressure angle is constant throughout the teeth engagement.
Cylindrical pair
Turning pair
Rolling pair
Sliding pair
1, 2 and 4
2, 3 and 4
1, 2 and 3
1, 3 and 4
Simple train of wheels
Compound train of wheels
Reverted gear train
Epicyclic gear train
Lower pair
Higher pair
Self-closed pair
Force-closed pair
Remain in the same place for all configurations of the mechanism
Vary with the configuration of the mechanism
Moves as the mechanism moves, but joints are of permanent nature
None of the above
15
28
30
8
Crank has uniform angular velocity
Crank has nonuniform angular velocity
Crank has uniform angular acceleration
Crank has nonuniform angular acceleration
Between I₁, and I₂ but nearer I₁
Between I₁, and I₂ but nearer to I₂
Exactly in the middle of the shaft
Nearer to I₁ but outside
tp /16
tp /4
4 tp
16 tp
Static friction
Dynamic friction
Limiting friction
Coefficient of friction