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To protect the characteristics of vibratory system, which type of measuring instrument is...

Q.  
To protect the characteristics of vibratory system, which type of measuring instrument is used


Answer & Explanation

Non contact type measuring instruments does not make any physical contact with vibrating body thus preserving its characteristics.

Thus correct option is: D.

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More Questions Dynamics of Machinery:

Q.  
For static balancing of the enegine, which of the following condition is necessary?

A. Force couple must be close

B. Couple polygon must be close

C. Both (A) and (B)

D. Force couple must be open


Answer & Explanation

Q.  
The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because the

A. unbalance couples are caused only at higher speeds

B. unbalance forces are no dangenrous at higher speeds

C. effect of unbalances are proportional to the square of the speed

D. effect of unbalances are directly proportional to the speed


Answer & Explanation

Q.  
When two rotors rotate in one direction and middle one rotates in opposite direction, then torsional vibration occurs with

A. Four nodes

B. Three nodes

C. Two Nodes

D. Single node


Answer & Explanation

Q.  
One of the methods of vibration control is, controlling the natural frequencies of the system and ______ under excitation.

A. Introducing a damping

B. Use of vibration isolator

C. addition of vibration absorber

D. avoiding resonance


Answer & Explanation
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