ET401 Quiz 7 Fall 2018

Transcription

1 Name Circle one: Section B (0900) A (1000) C(1200) MMA P.O. Box #: ET401 Quiz 7 Fall 2018 The following multiple choice questions may have a single correct answer, more than one correct answer, or no correct answer. For each question mark all of the answers that are correct. The figure below pertains to questions 1-6: is A. SP B. PV C. K P D. summing junction E. error 2. 2 is A. SP B. PV C. K P D. summing junction E. error 3. The signal at 3 is C. summing junction 4. The op amp at4 is C. summing junction 5. 5 is C. SP 6. The type of controller represented here is A. a P-only controller B. a PI controller C. a PD controller D. an I-only controller E. a PID controller

2 The figure at right below pertains to questions 7-10: 7. Select any statements that are correct A. The block upstream of this one is the summing junction B. The error is generated internally in this block C. error = PV SP D. error = SP PV E. error = 0 8. If the block is a PI controller A. TD = 0 B. TR = 0 C. KP = 0 D. TR and TD 0 E. TR = TD 9. Select any responses that are correct A. XOUT = 0 if PV and SP = 0 B. XOUT = 0 if PV = SP C. XOUT = 0 if PV = SP and KP = 0 D. XOUT = 0 if KP, TR, and TD = 0 E. XOUT 0 IF SP PV and KP To have a PI controller (select any that are correct) A. KP must 0 B. TR must C. 0 < TR < D. TD must 0 E. TD must = 0 The figure below pertains to question 11: 11. In the PID controller shown above, to what register address is the actual analog signal of the measurement delivered? A B C D. 0331

3 The following figure pertains to questions 12-14: 12. The units for K Engine are A. sec/gpm B. gpm/sec C. lb ft/gpm D. gpm/lb ft E. lb ft/sec 13. The loop shown is A. a regulator loop B. a positioner loop C. a cascade-control loop D. a loop without a controller E. an open loop 14. Together the Governor/Fuel rack/engine s steady-state gain has units A. lb ft/gpm B. lb ft/sec C. lb ft/rpm D. sec/rpm E. sec/gpm The figure below pertains to questions 15-17: 15. If the ship is turning to starboard, hydraulic fluid moves the rudder by flowing (mark all that are true) A. from left to right B. from right to left C. at a rate that depends on voltage to the servo valve D. at a rate that depends upon the velocity of the ship E. at a rate that depends on the pitch of the ship s propeller 16. The rudder turns the ship (mark all that are true) A. by skidding the ship s longitudinal axis sideways to the direction of travel B. by setting up hydrodynamic pressure forces on the outside of the hull that push the ship sideways C. by increasing the rate-of-turn from 0 deg/sec to some steady-state value D. by increasing the rate-of-turn into a spiral that gets forever tighter E. by skewing the longitudinal axis of the ship so that it is aligned with the new direction of travel

4 17. The linked control valves shown (select all that are correct) A. represent two valves that are electrically connected B. represent two valves whose motion is coordinated C. represent a single hydraulic servo valve D. are on/off valves that must actuate in unison E. modulate the speed at which the rudder moves The figure below pertains to questions For each question, mark all correct answers. A B C 18. The controller set-up shown in the diagram is known in industry as A. a dual control system B. a compound control system C. a cascade control system D. an inverse control system E. a feedforward control system 19. The physical units for the box shown above as B are A. deg/volt B. deg/gpm C. / D. lb ft/gpm E. lb ft/volt D 20. The actuator(s) in the system is/are A. B and D B. D and E C. B and E D. A and B E. B and C 21. The sensor(s) in the system are A. A and B B. A and E C. D D. E E. D and E E The following figure at right pertains to questions 22-23: 22. The A-D converter represented has A. a 1000-bit resolution B. a 32-bit resolution C. an 8-bit resolution D. a 4-bit resolution E. a 2-bit resolution 23. To double the resolution of the converter A. one doubles the number of bits used B. one doubles the sample time of the converter C. one halves the sample time of the converter D. one increases the number of bits by 1 E. one increases the number of bits by 2

5 24. The standard electrical signal for analog measurement transmission is A. 0 to +5 volts B. -5 to +5 volts C. 0 to 20 ma D. 4 to 20 ma E. 0 to +12 volts 25. SCADA stands for A. Single cascade analog-to-digital acquisition B. Sequence control and data acquisition C. Supervisory control and digital-to-analog D. Supervisory control and data acquisition 26. Today s SCADA and DCS systems are distinguished from each other by A. a SCADA system consists of PLCs; a DCS has only PIDs B. a SCADA system has point-to-point data connections; a DCS uses a networked (or bus) data system C. a SCADA system is just for plant monitoring; a DCS can also monitor the plant, but the plant can also be run from the DCS D. a SCADA system can run just one plant; a DCS can be used to run multiple plants E. very few characteristics; SCADA and DCS systems nowadays are very similar to each other 27. DCS stands for A. Digital control system B. Distributed control system C. Digital control sequencing D. Dual-computer system