Question

The increasing demands of higher productivity and economical design lead to higher operating speeds of machinery. These trends make the occurrence of resonant conditions less frequent during the operation of machinery and reduce the reliability of the system
true or false

Answer 1

False.

Explaination : the first part of statement is true as it states that higher speed of machinery is required to meet increasing demands and higher rate of production since higher speed of machinery will increase the production rate. From year 1940 to 1980, the speed of working of machineries had nearly doubled.

With increase in operating Speed of machineries, the imbalance force in system increases significantly moreover as soon as the operating Speed approaches the resonance frequency of rotating component, the vibration forces increase significantly and the element becomes less reliable. Therefore we can say that with increasing speed of operation the occurrence of resonant frequency becomes more frequent and reliability of machinery is reduced.