EXAMINATION : INSTRUMENTATION

1.        Which component does this graphical symbol illustrate? 

Resistance temperature sensor    

2.       Which component does this graphical symbol illustrate?   

  Pressure to electric current converter      

                           

3.       Which component does this graphical symbol illustrate?         

Pressure indicator, installed on panel/console      

  

4.       Which component does this graphical symbol illustrate?

Remote level controller with indicator        

     

5.       Which component does this graphical symbol illustrate?

Pressure-reducing regulator.  

                      

6.       Liquid level in tanks is often measured by measuring the hydrostatic head or differential pressure. One method is the air bubble  type which is illustrated here. Calculate the level in the tank, utilizing the figures given on the drawing.

500 cm

7.       The pressure inlet to a pressure gauge is varied from zero to full scale and back to zero again. The output (indicating pressure) versus true pressure is shown in the diagr.The non - coincidence of loading and unloading curve is due to internal friction in the instrument. What do we call this phenomenon?

Hysteresis

8.       The diagram is a calibration diagram for a pressure gauge. What do you call the slope of the calibration curve?

Sensitivity

9.       U-tube manometers are often used to measure differential pressure. Which of the listed pressures is U-tube manometers mostly used for?

Low differential pressures

10.   Two reference points for pressure exist, absolute zero and atmospheric pressure. What do you call pressures measured relative to absolute zero?

Absolute pressure

11.   Two reference points for pressure exist, absolute zero and atmospheric pressure.  What do you call pressures measured relative to atmospheric pressure?

Gauge pressure