Types of Kinematic Chains

Question 1
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Pass Ratio : 100%
Oldham’s coupling is used to transmit power between two parallel shafts which are slightly offset.
True
false
Explanation:
It is used for transmitting angular velocity between two parallel but eccentric shafts.
Question 2
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For one degree of freedom planer mechanism having links, which one of the following is the possible combination?
j = 4 + 2 x 2 ≠ 7
j = 4 x 2 + 2 ≠ 7
j = 3 x 2 + 2 ≠ 7
j = 1 x 2 + 5 ≠ 7 the ans is d.
Explanation:
From Grubler’s criteria 1 = 3(l – 1) – 2j
Question 3
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Ina kinematic inversion, the relative motions between links of the mechanism change as different links are made the frame by turns.
True
Explanation:
Through the process of inversion the relative motions between the various links is not changed in any manner but their absolute motions may be changed drastically.
Question 4
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Scotch yoke mechanism is used to generate
Sine functions
Square roots
logarithms
inversions
Explanation:
In Scotch Yoke mechanism, the constant rotation of the crank produces harmonic translation of the yoke. Its four binary links are:
Question 5
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Which of the following are inversions of a double slider crank chain?
1 and 2
1, 3 and 4
2 and 3
2, 3 and 4
Explanation:
Double slider crank mechanism
Question 6
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Pass Ratio : 100%
In a shaping operation, the average cutting speed is ( Stroke length S, Number of strokes per minute N, Quick return ratio R)
NSR
NSR/2
NS(1 + R)
NS(1 + R)/2
Explanation:
Time for forward stroke + Tf
Question 7
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In Oldham’s coupling the condition for maximum speed ratio is
w1cosα/W
w1sinα/W
w1/W = 1/cosα
w1/W = 1/sinα
Explanation:
w1/W = cosα/1 – cos2Ï´sin2α
Question 8
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The relative acceleration of two points which are at variable distance apart on a moving link can be determined by using the
three centers in line theorem
instantaneous centre of rotation method
Coriolis component of acceleration method
Klein’s construction
Explanation:
The relative acceleration of two variable points on a moving link can be determined by using the instantaneous centre of rotation method.
Question 9
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Inversion of a kinematic chain relative to some other links is a property of the chain and is not that of the mechanism.
True
False
Explanation:
In a kinematic inversion relative motion does not change but absolute motion change drastically.
Question 10
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Pass Ratio : 100%
What is the number of instantaneous centres of rotation for a 6-link mechanism?
4
6
12
15
Explanation:
N = n(n – 1)/2 = 6 x (6 – 1)/2 = 15.