Coupler link is fixed
Longest link is a fixed link
Slider is a fixed link
Smallest link is a fixed link
A. Coupler link is fixed
Quick return mechanism of shaper
Four bar chain mechanism
Slider crank mechanism
Both (A) and (C) above
Coupler link is fixed
Longest link is a fixed link
Slider is a fixed link
Smallest link is a fixed link
Bulky
Wears rapidly
Difficult to manufacture
Both (A) and (B) above
Perpendicular to sliding surfaces
Along sliding surfaces
Somewhere in between above two
None of the above
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
fn/2
2 fn
4 fn
8 fn
Two links
Three links
Four or more than four links
All of these
R (1 - cosθ)
(R - r₁) (1 - cosθ)
R (1 - sinθ)
(R - r₁) (1 - sinθ)
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
Equal to
Less than
Greater than
None of these
ω (r₁ r₂) sinθ
ω (r₁ + r₂) sinθ sec2θ
ω (r₁ r₂) cosθ
ω (r₁ + r₂) cosθ cosec2θ
One-half
Two-third
n times
1/n times
Magnitude of the forces on journal
Angular velocity of journal
Clearance between journal and bearing
Radius of journal
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
Purely turning
Purely sliding
Purely rotary
Combination of sliding and turning
Less than unity
Equal to unity
Greater than unity
Zero
Is in motion
Is at rest
Just begins to slide over the surface of the other body
None of the above
Zero
Minimum
Maximum
None of these
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
Theory of machines
Applied mechanics
Mechanisms
Kinetics
m.ω².r sinθ
m.ω².r cosθ
m.ω².r (sin 2θ/n)
m.ω².r (cos 2θ/n)
Maximum and zero
Zero and maximum
Minimum and maximum
Zero and minimum
G.I₂
G².I₂
I₂/G
I₂/G²
Scott-Russell's mechanism
Hart's mechanism
Peaucellier's mechanism
All of these
Of relative velocity vector for the two coincident points rotated by 90° in the direction of the angular velocity of the rotation of the link
Along the centripetal acceleration
Along tangential acceleration
Along perpendicular to angular velocity
0° and 90°
90° and 180°
135° and 315°
270° and 360°
10°-15°
15°-25°
25°-30°
30°-40°
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
a is +ve and b = 0
a = 0 and b is +ve
a is +ve and b is -ve
a is +ve and b is also +ve
tan (α + φ)/tanα
tanα/tan (α +φ)
tan (α - φ)/tanα
tanα/tan (α - φ)