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Mechanical Engineering - Theory of machines

Exercise : Theory of machines - Section 1
16.
In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is
equal to one
equal to 2
less than 2
greater than 2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
ω1.ω2.r
( ω1 - ω2)r
( ω1 + ω2)r
( ω1 - ω2)2r
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the
0.5
1
1.5
2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m2 attached in the same plane of rotation as that of m1, such that (where r1 and r2 are the radii of rotation of m1 and m2 respectively)
m1r2 = m2r1
m1r1 = m2r2
m1m2 = r1r2
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
In railway axle boxes, the bearing used is
deep groove ball bearing
double row self-aligning ball bearing
double row spherical roller bearing
cylindrical roller bearing
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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