A. 90 RPM
B. 100 RPM
C. 80 RPM
D. None of the mentioned
Answer: Option A
This Question Belongs to Mechanical Engineering >> Theory Of Machine
In considering friction of a V-thread, the virtual coefficient of friction (μ1) is given by
A. μ1 = μsinβ
B. μ1 = μcosβ
C. $${\mu _1} = \frac{\mu }{{\sin \beta }}$$
D. $${\mu _1} = \frac{\mu }{{\cos \beta }}$$
The lower pairs are _________ pairs.
A. Self-closed
B. Force-closed
C. Friction closed
D. None of these
In a coupling rod of a locomotive, each of the four pairs is a ________ pair.
A. Sliding
B. Turning
C. Rolling
D. Screw
A kinematic chain is known as a mechanism when
A. None of the links is fixed
B. One of the links is fixed
C. Two of the links are fixed
D. None of these
Solution: Given,
Moment of inertia of first body (I1) = 30 kg m^2
Rotational speed of first body (ω1) = 210 RPM
Moment of inertia of second body at rest (I2) = 40 kg m^2
To find: Resultant speed after meshing Formula:
Conservation of Angular Momentum: I1ω1 = (I1+I2)ω2
where, ω2 = Resultant speed after meshing
Calculation: Substituting the given values in the formula, we get
30 × 210 = (30 + 40) × ω2 ω2 = (30 × 210) / (30 + 40) ω2 = 90 RPM
Therefore, the resultant speed after meshing is 90 RPM.
Wrong answer 157.5 right answer
how to solve it.. any one