ISA CCST Level III | 78 Questions and Answers(A+ Solution guide)

A Calibration procedure calls for checking a chemical cell oxygen analyzer daily. The range of the analyzer is 0 to 1000 PPM, and the procedure states that ambient air be used for the check. The chemical cell costs $350 and has a rated six months life. Cells are being replaced monthly.You Should: - ✔✔ A. Try to find a supplier of the sensor cells that is not as expensive. B. recommend a different type analyzer be used. C. recommend that a calibration system be installed using a 1000 PPM calibrating gas. D. continue the procedure. * In order to measure fluid flow with a Doppler type ultrasonic flow meter, the flowing stream must ____ to reflect the sonic pulses. - ✔✔ A. Contain particulate matter * B. Flow at a rate of 100 gallons per min, or more C. be conductive D. have a very low viscosity Transmitter steady state gain (output/input) should be ____ over it's entire range. - ✔✔ A. Variable B. constant * C. adjustable D. calibrated Most "smart" transmitter interface devices have a key pad with alpha -numeric keys, function keys and an LCD display. Display of the ____ is NOT available on the LCD display and cannot be changed. - ✔✔ A. transmitter piping and installation diagr am * B. transmitter engineering data C. transmitter upper and lower input range values D. transmitter upper and lower output range values A fluid is flowing through a 12 inch diameter pipe at a velocity of 4 ft/sec. When the piping reduces to 6 inch diame ter, and all other flowing paramters remain the same, the fluid velocity becomes ___ ft/sec. - ✔✔ A. 1 [Pipe Dia = √ (4 * flow rate)/( π * velocity)] B. 8 [velocity = (4 * flow rate)/(π *Pipe Dia2)] C. 16 [flow rate = 0.25 * π *Pipe Dia2 * velocity]* D. 24 ( Find flow rate (3.14)and solve for ft 12.56/0.785) A 50 microampers meter with a 200 milivolt raiting is being used to check voltage. What multiplier resistor value must be used to obtain a 10 volt full scale range (in ohms)? - ✔✔ A. 20k V = I * R B. 196K R = V / I C. 200K I = V / R (.00005)* D. 204K After controller settings are made using a process reaction curve method: - ✔✔ A. all settings must be documented for future use. B. the process should track set point with an exact precision. C. the process should be monitored for any necessary fine tuning. * D. the transmitter and control valve should be checked for calibration and accuracy. This electronic DP cell requires calibration to correct for the - ✔✔ A. zero error B. span error C. zer o, span and linearity errors * D. linearity error A self tuning algorithm is particularly valuable when a ____ must be controlled. - ✔✔ A. non - linear process * B. high temperature C. absolute pressure D. oscillating flow The velocity of a fluid can be d etermined by dividing the ___? - ✔✔ A. viscosity of the fluid by the area of the pipe B. density of the fluid C. the rate of flow of the fluid by the area of the pipe * D. volume of the fluid When tuning a cascade control loop, the slave controller needs _ __? - ✔✔ A. proportional response only * B. proportional plus integral response C. proportional, integral, and derivative D. proportional plus derivative A controller gain setting is greater than "1": You would expect its respons to be similar to a control ler with ____ proportional band. - ✔✔ A. a narrow * B. no C. direct D. wide Reset or integral control action is usually combined with proportional control action to eliminate ____. - ✔✔ A. cycles B. offset * C. overshoot D. slow response The conversion accuracy of a 10 -bit analog -to-digital converter is__________? - ✔✔ A. 0.98% of Measurement B. 0.098% of Measurement C. 0.098%FS * D. 0.98%FS Computer -aided calibration systems (CAC) execute a program in order to______? - ✔✔ A. Collect statis tical process data B. Reset controller set points