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Mechanical Engineering - Theory of machines

Exercise : Theory of machines - Section 3
41.
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done
because of difficulty in manufacturing cam profile
because of loose contact of follower with cam surface
in order to have acceleration in beginning and retardation at the end of stroke within the finite limits
because the uniform velocity motion is a partial parabolic motion
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
The contact ratio for gears is
zero
less than one
greater than one
infinity
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the angle of advance of the eccentric but reducing the throw of the eccentric and keeping the steam lap and exhaust lap constant. This method will cause withdrawing or throttling of steam.
Agree
Disagree
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
A governor is said to be stable, if the
radius of rotation of balls increases as the equilibrium speed decreases
radius of rotation of balls decreases as the equilibrium speed decreases
radius of rotation of balls increases as the equilibrium speed increases
radius of rotation of balls decreases as the equilibrium speed increases
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
In a Proell governor, the balls are attached to the extension of lower links.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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