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Mechanical Engineering - Theory of machines - Discussion

Discussion Forum : Theory of machines - Section 2 (Q.No. 43)
Theory of machines
43.
A body is said to be under forced vibrations, when
there is a reduction in amplitude after every cycle of vibration
no external force acts on a body, after giving it an initial displacement
a body vibrates under the influence of external force
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
30 comments Page 1 of 3.
Indrajeet said:   9 years ago
The given answer if wrong.

The correct answer is option A.

When a body vibrates under influence of force is called Forced vibration. But when its amplitude reduces due friction then it is know as Damped vibration.
Meenu Elizabeth said:   8 years ago
The answer is C.

Forced vibration is when a time-varying disturbance (load, displacement or velocity) is applied to a mechanical system. i.e by the influence of an external force.
Dwaipayan Gupta said:   4 years ago
C could have been the correct answer if the term "periodic" was written over there and A can never be the correct answer.
Vanraj Gajarotar said:   9 years ago
I Also agree with Thorat Ganpati and the answer is only C because in force vibration amplitude not decrease every cycle.
Thorat ganpati said:   1 decade ago
Why only A?, C can also be the answer because in forced vibration the body vibrates under external influence of force.
Starlord bhati said:   6 years ago
Beacuse when the amplitude reduces after every cycle that vibrations are called damped vibrations.
Ankit said:   9 years ago
The Right Answer must be C, as body vibrates with external force during Forced vibrations.
Basavarajappa said:   5 years ago
Option A is for undamped free vibration, and here the right answer is C.
Abhishek said:   9 years ago
Yeah! I agree with you @Thorat Ganpati.

Answer should be option C.
PANDIANPRABU said:   9 years ago
Absolutely option C is the correct answer.
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