Process Control and Instrumentation
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

Using steel tube in place of glass tube
Accounting for the tube expansion
Filling nitrogen under pressure in the stem
Increasing the diameter of the tube

ANSWER DOWNLOAD EXAMIANS APP

Process Control and Instrumentation
For a feed back control system to be stable, the

Poles of the closed loop transfer function should lie in the left half of the complex plane
Poles of the closed loop transfer function should lie in the right half of the complex plane
Bode plots of the corresponding open loop transfer function should monotoni-cally decrease
Roots of the characteristic equation should be real

ANSWER DOWNLOAD EXAMIANS APP