Process-Control-and-Instrumentation Related Question Answers

1. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.






2. The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly






3. Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.






4. The closed loop pole of a stable second order system could be






5. An amplitude ratio of 0.1 corresponds to __________ decibels.






6. Which of the following can not measure a temperature of 1600°C ?






7. Pick out the first order system from among the following.






8. Flow rate of a river is measured by a/an






9. Working principle of disappearing filament type optical pyrometer is based on the






10. Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a






11. Pressure of 0.0001 absolute psi can be measured by __________ gauge.






12. Which of the following controllers has the least maximum deviation ?






13. Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is






14. A negative gain margin expressed in decibels means a/an __________ system.






15. Typical specifications for design stipulates the gain margin and phase margin to be respectively






16. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an






17. Volumetric expansion is the working principle of the __________ thermometers.






18. __________ thermometer can not measure sub-zero (< 0° C) temperature,






19. Which of the following is not the triple point of water ?






20. The __________ of a vapor pressure thermometer is a primary element.






21. Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.






22. Alphatron measures pressure __________ microns.






23. Liquid flow rate in a small channel is best measured by a/an






24. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?






25. 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






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