Process Control and Instrumentation Questions

• "An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall". This is the working principle of a
• Silver point temperature is __________ °C.
• Platinum resistance thermometer can be used upto antimony point which is __________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure.
• Block diagram of a simple standard control system is shown below in the figure. Which of the following statement about the above control system is wrong?
• Bimetal strips are not used in
• Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are
• Mcleoid gauge is used to measure the
• A non-linear system will have __________ steady state values.
• Which of the following thermocouples is capable of measuring a temperature of -50°C?
• Photoelectric pyrometers are suitable in the temperature range of __________ °C.
• The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since
• The pressure sensing element of elastic type pressure gauge is never made in the form of a
• A stable system is the one
• In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is
• Bourdon tube is never made of
• Hot wire anemometer is used for the measurement of
• In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.
• Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).
• Response of a linear control system for a change in set point is called
• Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?