Process Control and Instrumentation

231. The transfer function for an ideal proportional plus reset controller (reset time T) is

1. K_c[1 + (1/TS)]
2. K_c(1 + TS)
3. K_c/(1 + TS)
4. K_c/[1 + (s/T)]

View answer

232. The transfer function of a first order system is

1. 1/(Ts + 1)
2. 1/Ts
3. s/(Ts + 1)
4. None of these

View answer

233. The transfer function of a pure dead time system with dead time ηd is

1. 1/(η_ds + 1)
2. η_ds + 1
3. e^-η_s^s
4. e^η_d^s

View answer

234. The transfer function of a second order system is

1. 1/(T²S² + 2ξT_s + 1)
2. 1/(T²S² + 2T_s + 1)
3. 1/(T²S² + 2ξT + 1)
4. None of these

View answer

235. The unit of 'time constant' of a system is the same as that of

1. Velocity
2. Time
3. (Time)^-1
4. None of these

View answer

236. The unit step response of the transfer function (2s - 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after

1. A monotonic increase
2. A monotonic decrease
3. Initially increasing and then decreasing
4. Increasing decreasing and then increasing

View answer

237. The unit step response of the transfer function 1/(S² + 2s + 3)

1. Has a non-zero slope at the origin
2. Has a damped oscillatory characteristics
3. Is overdamped
4. Is unstable

View answer

238. Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

1. CO₂
2. N2
3. O₂
4. CO

View answer

239. Thermal conductivity cell is the primary element of a/an _________ analyser.

1. Oxygen
2. Carbon dioxide
3. Carbon monoxide
4. Sulphur dioxide

View answer

240. Thermal conductivity measurement com-prises the working principle of a

1. CO₂ analyser
2. Polarimeter
3. Spectrometer
4. Chromatograph

View answer