Instrumentation and Process control quiz 2018

INSTRUMENTATIONS AND PROCESS CONTROL QUIZ

Q. 1. Match the items in Column A with the items in Column B

Here, ϕ denotes the phase shift, K₁ and K₂ the process gains, τ the time constant, and AR the amplitude ratio.

P-II, Q-III, R-IV, S-I
P-III, Q-II, R-IV, S-I
P-I, Q-IV, R-II, S-III
P-IV, Q-I, R-II, S-III

Q. 2. A first-order process having a transfer function, is controlled by a proportional controller with gain of 3.2. The process time constant is in minutes. Addition of the integral control action with an integral time constant of 5 minutes leads to increase in

offset
speed of response
order of the closed loop system
proportional band

Q. 3 Pitot tube is used to measure

liquid level in a tank
flow velocity at a point
angular deformation
vorticity

Q. 4 The figure which represents for x > 0 (x in radians) is

Q. 5 The decay ratio for a system having complex conjugate poles as and is

7*10^-1
8*10^-2
9*10^-3
10*10^-4

Q. 6 Consider the following transfer function

Where, the natural period of oscillation is in minimum. The amplitude ratio at a frequency of 0.5 rad/min is .....................(rounded off to second decimal place.)

Q. 7 For a closed-loop system, consider the following transfer functions:
Process G_P(S), controller G_c(S) , measuring device G_m(S) , and final control element G_f(S)
The offset in the closed loop response due to a unit step change introduced in the set point of the output variable is .............