Process Control and Instrumentation MCQs

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.

The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

__________ stability method uses open loop transfer function.

The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function $$\frac{{{\text{K}}\left( {{\text{s}} + 1} \right)}}{{2\left( {2{\text{s}} + 1} \right)\left( {3{\text{s}} + 1} \right)}}$$    will have a definite number of loci for variation of K from 0 to $$\infty $$. The number of loci is

Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

The transfer function of a process is $$\frac{1}{{16{{\text{s}}^2} + 8{\text{s}} + 4}}.$$    If a step change is introduced into the system, then the response will be

Compositional analysis of __________ is done using mass spectrometer.

Pick out the one which is a first order instrument.

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