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To have natural frequency of instrument very high, spring stiffness should be

Q.  
To have natural frequency of instrument very high, spring stiffness should be


Answer & Explanation

Answer :   Option: B


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More Questions Dynamics of Machinery:

Q.  
Find the critical speed when trailer is travelling over a raod with profile approximated by a sine wave of amplitude 0.08 m and wavelength 14 m. Take natural frequency is 9.9 rad/sec

A. 0.794 km/hr

B. 7.94 km/hr

C. 79.4 km/hr

D. 794 km/hr


Answer & Explanation

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

A. Active

B. Passive

C. Contact type

D. Non contact type


Answer & Explanation

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
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