A20 kg instrument is mounted to four springs in parallel of 800 n/m stiffness each. the mount is subjected to harmonic force of f(t) = 32sin(8t) n. determine the amplitude of steady-state vibration and the frequency

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)