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Theory of Machine

Theory of Machine
The velocity of a body moving with simple harmonic motion is __________ at the mean position.

Minimum
Zero
None of these
Maximum

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

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Theory of Machine
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

Logarithmic decrement
Magnification factor
Damping factor
Damping coefficient

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Theory of Machine
Governor is used in automobile to

Maintain constant engine speed
Maximize the fuel economy
Limit the vehicle speed
Decrease the variation of speed

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Theory of Machine
The main disadvantage of the sliding pair is that it is

Difficult to manufacture
Bulky
Both (A) and (B) above
Wears rapidly

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Theory of Machine
The example of spherical pair is

Ball bearing and roller bearing
Bolt and nut
Ball and socket joint
Lead screw of a lathe

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