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The ratio of the intensity of sound that is obsorbed from the boundary...

Q.  
The ratio of the intensity of sound that is obsorbed from the boundary or material to the intensity of sound incident on it is called as


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Answer :   Option: A


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More Questions Dynamics of Machinery:

Q.  
The ratio of the intensity of sound that is reflected from the boundary to the intensity of sound incident on it is called as

A. Absorption coefficient

B. Transmission coefficient

C. Reflection coefficient

D. None of these


Answer & Explanation

Q.  
Consider the following statements for completely balancing a single rotating mass:
1. Another rotating mass placed diametrically opposite in the same plane balances the unbalanced mass.
2.Another rotating mass placed diametrically opposite in a parallel plane balances the unbalanced mass.
3.Two masses placed in different planes balance the unbalanced mass.
Which of the above statement is/are correct?

A. 1 only

B. 1 and 2

C. 2 and 3

D. 1 and 3


Answer & Explanation

Q.  
Which of the following conditions should be satisfied for static balancing ?
1. Dynamic forces acting on the system should be zero
2. Couple acting on the system due to dynamic force should be zero
3. Centrifugal forces acting on the system should be zero
4. Couple acting on the system due to centrifugal forces should be zero

A. Condition 1 and condition 2

B. Condition 1 and condition 3

C. Condition 3 and condition 4

D. Condition 2 and condition 3


Answer & Explanation

Q.  
In which of the following condition torsional vibration will not take place, considering 3 rotors A, B and C. A is rotating in clockwise direction.

A. B in clockwise C in anticlockwise

B. C in clockwise B in anticlockwise

C. B and C in clockwise

D. B and C in anticlockwise


Answer & Explanation
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