M3H324747 : Process Control and Instrumentation Engineering - Engineering Assignment Help

Assignment Task :

Question 1.0 

A thermocouple which is a temperature sensor has a static transfer function of 0.15 mV/oC and a time constant of ‘τ’ . If a step change of Tito Tfshown in Table 1.0 is applied at t = 0 sec, determine the following; 

(i) The output voltages at 0.5 sec, 2.0 sec, and 9 sec;

(ii) The indicated temperature at these times mentioned in item (i). 

Question 2.0 

Construct a block diagram of a refrigerator control system. Define each block in terms of refrigerator components. Clearly describe and discuss the following; 

(i) Measurement system of refrigerator and its working principle;

(ii) Device for setpoint and how the setpoint is being implemented;

(iii) Controller of refrigerator and its working principle;

(iv)The process element of the refrigerator;

 (v)The final control element and its working principle. 

Question 3.0 

A certain device uses a pressure-measurement system thru a sensor that converts pressure into voltage according to the  transfer functions, Vp = 0.5 P . This voltage is then converted into a current. As the pressure varies from Pito Pf (psi) given in Table 3.0, the current varies from 4.0 mA to 20 mA which is a standard electrical signal.  Determine the following; 

(i) The relationship of the voltage to current;

(ii) The pressure differential ΔP, will cause the current to change by 1.0 mA from 19 mA to 20 mA;

(iii) The pressure differential ΔP, will cause the current to change by 1.0 mA from 4 mA to 5 mA;

(iv) The reason why the pressure change not the same in item (ii) and (iii), even though the current changed by 1 mA in both cases; [2] (v) Prepare a graph of current versus pressure and describe if it is linear or non-linear.

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