Process Control and Instrumentation Questions

• Psychrometer determines the
• The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system
• The experimental response of the controlled variable y(t) for a step change of magnitude P in the manipulated variable x(t) is shown below : The appropriate transfer function of the process is
• What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?
• Alphatron measures pressure __________ microns.
• Which of the systems having following transfer functions is stable?
• High temperature of around 2000°C of incandescent gas mantles is measured by a/an
• The temperature range for which copper resistance thermometer can be used is __________ °C
• Reset rate is the another term used for __________ time.
• What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?
• A pyranometer is an instrument used for measuring the
• An aneroid barometer measures the __________ pressure.
• Which of the following does not figure in the list of seven substances selected for international temperature scale?
• Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?
• Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.
• Mercury thermometer can be used to measure the temperature upto __________ °C.
• Bourdon gauges are used for measuring pressure (kg/cm2 )
• All the thermocouples used for temperature measurement use dissimilar metal
• The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is
• In a second order under damped system, the