Process Control and Instrumentation Questions

• Identify an unbounded input from inputs whose transfer functions are given below
• __________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'.
• In a single tank system, the transfer function of __________ to inlet flow rate is 1/TS+1.
• Working principle of disappearing filament type optical pyrometer is based on the
• Configuration of Bourdon spring tube is never made of __________ shape.
• What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2.
• Thermodynamic celcius scale of temperature measurement is
• The transfer function for an ideal proportional plus reset controller (reset time T) is
• Thermocouple in a thermal well behaves as a true
• Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.
• Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)
• According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is
• Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a
• The fluid used in hydraulic controller is
• Feed forward controller accounts for the __________ changes.
• Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.
• The __________ of a vapor pressure thermometer is a primary element.
• "A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is __________ criterion.
• Measurement of pressure in ammonia reactor is done by
• A process is initially at steady state with its output y=l for an input u=l. The input is suddenly changed to 2 at time t=0. The output response is y(t)=1+2t. The transfer function of the process is