1. Measuring element is used to. a. manipulate the variable. b. Sense the controlled variable. c. control the variable. d. carry out chemical process.

2. For negative feedback control system: a. The measured variable is added to the set point. b. The error is the difference between the set point and the measured variable. c. The set point is multiplied by measured value. d. The controlled variable is added to the set point.

3. Turbine is used to measure, a. composition b. flow c. temperature d. pressure

4. Electrical (conductivity) is used to measure, a. flow b. temperature c. level d. composition

5. Mass spectrometry is used to measure a. temperature b. composition c. flow d. pressure

6. Piezoresistive transducers is used to measure,

a. Flow b. Pressure e. Temperature d. composition

7. Time constant of liquid- level tank is equal to, a. volume/flowrate b. area* resistance c. weight/mass flow d. flowrate/volume

8. Thermometer is considered 1s order because one assumption is that a. All resistance to heat flow is in liquid film. b. All resistance to heat flow is in mercury film. c. All resistance to heat flow is in glass wall of the bulb d. No resistances in all films

9. The time constant of mixing reactor when compared with just mixing tank is: a. Equal b. Higher c. Lower d. Non of the above

10.The damping factor of two liquid-level tanks in series cannot be, a. Underdamped b. Critically damped c. Overdamped d. Non of the above