Process Control and Instrumentation According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is 0° 180° 90° 45° 0° 180° 90° 45° ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation In a closed loop system, the process to be controlled is an integrating process with transfer function l/2s. The controller proposed to be used in an integral controller with transfer function 1/T₁s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit Underdamped response Overdamped response Undamped response Unstable response Underdamped response Overdamped response Undamped response Unstable response ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are Air to open valve with the controller indirect acting Air to close valve with the controller indirect acting Air to close valve with the controller direct acting Air to open valve with the controller direct acting Air to open valve with the controller indirect acting Air to close valve with the controller indirect acting Air to close valve with the controller direct acting Air to open valve with the controller direct acting ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation When a bare thermocouple is covered by a protective sheath, the response becomes Faster and non-oscillatory Slower and oscillatory Faster and oscillatory Slower and non-oscillatory Faster and non-oscillatory Slower and oscillatory Faster and oscillatory Slower and non-oscillatory ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation 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 D³ D D² D⁴ D³ D D² D⁴ ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Liquid flow rate in a small channel is best measured by a/an Venturimeter Weir Vane meter Pitot tube Venturimeter Weir Vane meter Pitot tube ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS