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Theory of Machine

Theory of Machine
The relative velocity of B with respect to A in a rigid link AB is

Along AB
Perpendicular to AB
Parallel to AB
At 45° to AB

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Theory of Machine
There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

12
1/8
4/15
1/24

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Theory of Machine
The centre of gravity of a coupler link in a four bar mechanism will experience

No acceleration
Only angular acceleration
Both linear and angular acceleration
Only linear acceleration

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Theory of Machine
The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)

n = 4(l - 1) - 3j
n = (l -1) - j
n = 3(l - 1) - 2j
n = 2(l - 1) - 2j

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Theory of Machine
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

Coupler link is fixed
Smallest link is a fixed link
Slider is a fixed link
Longest link is a fixed link

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Theory of Machine
A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

Hyperbolic path
Elliptical path
Parabolic path
Straight line path

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