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Materials made from vegetable and mineral fibers, elastomeric foams, glass blankets, fiber boards...

Q.  
Materials made from vegetable and mineral fibers, elastomeric foams, glass blankets, fiber boards are example of


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Answer :   Option: C


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More Questions Dynamics of Machinery:

Q.  
Which of the following methods can be used to reduce excitation level at the source?

A. Lubrication of joints

B. Balancing inertia forces

C. Both 1. and 2.

D. None of the above


Answer & Explanation

Q.  
Secondary force in reciprocating engine mechanism is caused due to ______.

A. S.H.M. of reciprocating parts

B. Oscillation of reciprocating parts

C. Obliquity of arrangement of reciprocating parts

D. All of the above


Answer & Explanation

Q.  
In a harmonically excited single DOF mass-spring-damper system, the phase of damping force is

A. In phase with the spring force

B. Out of phase with the spring force

C. 90 degree behind the spring force

D. 90 degree ahead of the spring force


Answer & Explanation

Q.  
For occurrence of free torsional vibration in a three rotor system which of the condition is necessary?

A. Rotors moving in same direction

B. Rotors having same frequency

C. Rotors having different frequency

D. Rotors rotate in the same sense


Answer & Explanation
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