# Mechanical Engineering - Theory of machines

Exercise : Theory of machines - Section 6
1.
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)
qI
Explanation:
No answer description is available. Let's discuss.

2.
If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be
four times the first one
same as the first one
one fourth of the first one
one and a half times the first one
Explanation:
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3.
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 = 3(l - 1) - 2j
n = 4(l - 1) - 3j
Explanation:
No answer description is available. Let's discuss.

4.
In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
less sensitive
more sensitive
unaffected of sensitivity
isochronous