218. The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.
220. 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
221. Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.
222. 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
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