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Theory of Machine

Theory of Machine
When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

Zero
π/2
One
π

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

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

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

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Theory of Machine
The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is

Equal to 2
Equal to 1
Greater than 2
Less than 2

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Theory of Machine
In railway axle boxes, the bearing used is

Double row self aligning ball bearing
Cylindrical roller bearing
Deep groove ball bearing
Double row spherical roller bearing

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Theory of Machine
In order to balance the reciprocating masses,

Both (A) and (B)
Secondary forces and couples must be balanced
None of these
Primary forces and couples must be balanced

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