Process Control and Instrumentation Questions

• Dome temperature of blast furnace stove is most accurately measured by a
• Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.
• A manometer measures the __________ pressure.
• Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is
• Continuous measurement of specific gravity of a liquid is done by
• What is the Laplace transform of sin t?
• Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an
• In Bode plot, A.R. vs. w is plotted on a/an __________ graph paper.
• Stroboscope is used for the measurement of
• Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a
• Which of the following thermocouples has the least temperature measurement range?
• Continuous measurement of moisture content of paper in paper industry is done by measuring the
• Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.
• Working principle of mercury in glass thermometer is
• Composition of natural gas is determined by the
• Which is the strongest paramagnetic gas?
• Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?
• Phase lag of the sinusoidal response of a first order system is
• Which of the following can measure temperatures in the range of - 20 to 300°C?
• The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function will have a definite num-ber of loci for variation of K from 0 to ∞. The number of loci is