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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