An ideal PID controller has the transfer function . The frequency at which the m

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Chemical Engineering ‣ Process Control and Instrumentation Comments

Question
An ideal PID controller has the transfer function . The frequency at which the magnitude ratio of the controller is 1, is
Options
A. 0.5/0.2
B. 0.2/0.5
C. 0.2 x 0.5
D. 1/0.2 x 0.5

Correct Answer

1/0.2 x 0.5

Process Control and Instrumentation problems

Search Results

1. For the block diagram shown below :

The characteristic equation is
Options
A. ?_l S (?_ps + 1) + K_c . K_p (?_lS + 1) e^{-?_d s} = 0
B. (?_mS + 1) (?_pS + 1) + K_m . K_p e^{-?_d S} = 0
C. ?_l S(?_m S + 1) (?_p S + 1) +K_c . K_p . K_m (?_l s + 1) e-?_dS = 0
D. (?_ms + 1) (?_p s + 1) + K_c . K_p . K_m . e^-?_dS = 0

3. For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a
Options
A. large area but small mass.
B. high thermal conductivity.
C. small specific heat.
D. all'a', 'b' & 'c'.

6. Continuous measurement of moisture in paper is done by
Options
A. sling psychrometer.
B. hair-hygrometer.
C. weighing.
D. high resistance Wheatstone's bridge circuit.

7. The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.
Options
A. pressure
B. volume
C. viscosity
D. all (a), (b) and (c)

Comments

More in Chemical Engineering: