rite the answer in the Blank, only one answer is the best. (each 2% ) 3 16. What is the best description about the time constant in the first order system? (1) equivalent to the natural frequency, (2) the time to reach the steady state, (3) the time to reach 63.2% of the error fraction, (4) all solutions are correct 2 17. If given the systematic uncertainty of 0.15Pa and the random uncertainty of 0.35Pa, select the nearest combined uncertainty (Pa)? (1) 0.50,(2)0.38,(3)1.01,(4) all solutions are correct 2 18. Assume that the dependent variable y is related to a measured variable x by a function f(x). The uncertainty of x variable can be propagated to the y variable. What will dominate the uncertainty of the y variable? (1) the mean value of x,(2) the standard deviation of y,(3) the slope of the f(x),(4) all solutions are correct. 1 19. A second order system, the spring-mass model has the mass 1.0kg, and the spring constant of 100,000 N/m, we can estimate the natural frequency (Hz) is close to? (1) 316,(2)158,(3)50,(4) all solutions are not correct 3 10. In a second order system, the duration of the transient response is controlled by? (1) the natural frequency, (2) the damping ration, (3) the product of natural frequency and the damping ratio, (4) all solutions are correct