31. Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?
32. A non-linear chemical system is exemplified by a/an
33. The unit of 'time constant' of a system is the same as that of
34. Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.
35. Silver point temperature is __________ °C.
36. Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.
37. Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.
38. 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
39. Which of the following controllers has the least maximum deviation?
40. __________ controller has the maximum stabilising time.
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