Chemical Engineering  Process Control and Instrumentation
Exercise :: Process Control and Instrumentation  Section 3
16. 
An ideal PID controller has the transfer function . The frequency at which the magnitude ratio of the controller is 1, is 
A. 
0.5/0.2  B. 
0.2/0.5  C. 
0.2 x 0.5  D. 
1/0.2 x 0.5 
Answer: Option D
Explanation:

17. 
The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly 
A. 
linear  B. 
nonlinear  C. 
parabolic  D. 
hyperbolic 
Answer: Option A
Explanation:

18. 
Alphatron measures pressure __________ microns. 
Answer: Option C
Explanation:

19. 
What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ? 
Answer: Option C
Explanation:

20. 
The unit step response of the transfer functionreaches its final steady state assymptotically after 
A. 
a monotonic increase.  B. 
a monotonic decrease.  C. 
initially increasing and then decreasing.  D. 
increasing decreasing and then increasing. 
Answer: Option A
Explanation:
