Process Control and Instrumentation Questions

• Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is
• Routh stability method uses __________ loop transfer function.
• Time constant is the
• Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm3.
• Thermal conductivity measurement is used for the determination of
• Emission spectroscopy is used for
• Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.
• Characteristic equation is the denominator of __________ loop transfer function.
• Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?
• Mercury manometer (U-tube type) exemplifies a __________ order system.
• Which is the most suitable instrument for measuring pressure below 3 microns?
• Polarisation of light forms the working principle of a
• Working principle of radiation pyrometer is based on the
• Flow rate through an orifice is __________ the pressure differential.
• Bode stability method uses __________ loop transfer function.
• Dead zone in an instrument must be less than __________ percent of the scale.
• Liquid levels in autocalves are measued by
• Process degree of freedom indicates __________ number of controllers to be used.
• The transfer function of a pure dead time system with dead time τd is
• Gas analysis is commonly done using the