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Mechanical Engineering - Theory of machines

Exercise : Theory of machines - Section 4
11.
The displacement of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r1 = Minimum radius of the cam, and θ = Angle turned through by the cam)
R(1 - cos θ)
(R - r1)(1 - cos θ)
R(1 - sin θ)
(R - r1)(1 - sin θ)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral C Q NO, the acceleration of the piston is zero when the crank OC and connecting rod PC are at right angles to each other.
Correct
Incorrect
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
The contact ratio is the ratio of
length of pair of contact to the circular pitch
length of arc of contact to the circular pitch
length of arc of approach to the circular pitch
length of arc of recess to the circular pitch
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
An exact straight line motion mechanism is a
Scott-Russell's mechanism
Hart's mechanism
Peaucellier's mechanism
all of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)
P = W tan α
P = W tan (α + φ)
P = W (sin α + μ cos α)
P = W (cos α + μ sin α)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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