Process Control and Instrumentation Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature? Platinum-platinum + rhodium All of these Iron-constantan Chromel-constantan Platinum-platinum + rhodium All of these Iron-constantan Chromel-constantan ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit? Thomson effect Peltier effect Joule heating effect Seebeck effect Thomson effect Peltier effect Joule heating effect Seebeck effect ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Time constant is the Time taken by the controlled variable to reach 63.2% of its full change Same as transportation lag Time required by the measured variable to reach 63.2% of its ultimate change Same as dead time Time taken by the controlled variable to reach 63.2% of its full change Same as transportation lag Time required by the measured variable to reach 63.2% of its ultimate change Same as dead time ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation The amplitude ratio for the sinusoidal response of __________ is < 1. Second order system Transportation lag None of these First order system Second order system Transportation lag None of these First order system 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 non-oscillatory Faster and oscillatory Slower and oscillatory Faster and non-oscillatory Slower and non-oscillatory Faster and oscillatory Slower and oscillatory ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Thermal wells are used in the temperature measurement to Guard against corrosive and oxidising action on thermocouple materials Reduce measuring lag Increase the fidelity Increase the sensitivity Guard against corrosive and oxidising action on thermocouple materials Reduce measuring lag Increase the fidelity Increase the sensitivity ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS