Process Control and Instrumentation Questions

• A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same
• Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as
• For a feed back control system to be stable, the
• __________ controller has the maximum stabilising time.
• __________ type of element is normally not used in the bimetallic thermometers.
• Flow rate of sludge is not measured by a/an
• Which of the following is not a second order instrument?
• Thermal wells used in temperature measurements should have
• In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.
• Out of the following themocouple wire insulating material, the highest temperature rating is for
• Which of following error integral is considered as the best criterion in controller settings?
• Thermistors are used in __________ devices.
• The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to
• Stalagmometer is used for the measurement of
• Phase lag of the frequency response of a second order system to a sinusoidal forcing function
• Zirconia probe is used for the measurement of
• Which of the following fluid flow measuring devices can measure the largest flow rate?
• Polarograph is meant for the analysis of
• The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches
• E.m.f. generated by thermocouples is of the order of