# Mechanical Engineering - Theory of machines

Exercise : Theory of machines - Section 1
6.
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
90°
180°
360°
Explanation:
No answer description is available. Let's discuss.

7.
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon
total lift, total angle of lift, minimum radius of cam and cam speed
radius of circular arc, cam speed, location of centre of circular arc and roller diameter
mass of cam follower linkage, spring stiffness and cam speed
total lift, centre of gravity of the cam and cam speed
Explanation:
No answer description is available. Let's discuss.

8.
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
stable
unstable
isochronous
none of these
Explanation:
No answer description is available. Let's discuss.

9.
The factor which affects the critical speed of a shaft is
diameter of disc
span of shaft
eccentricity
all of these