Assignment 5 (LO3) Problem I: Select the most correct answer I. Open loop contro

Question

Assignment 5 (LO3) Problem I: Select the most correct answer I. Open loop controllers have this characteristic: They don't use feedback a. b. They don't observe the output Can't compensate for disturbance All of the above c. d. 2. This is an example of an open-loop system a. b. c. d. 8. Stepper motor Light bulb TV remote control Any of the above 3. A motor which rotates to one of a number of fixed positions by sending a stream of clectrical pulses to it causing it to rotate by exactly that many steps is of this kind: a. DC motor b. AC motor c. Stepper motor d. None of the above 4. A control system which measures a process variable and sends the measurement to a controller for comparison to setpoint. If the process variable is not at setpoint, control action is taken to return the process variable to setpoint is of this type a. Open loop control system b. Closed loop control system c. Feed forward control system d. None of the above 5. This is a closed loop control system: a. Temperature controlled toaster b. Cruise control c. Elevator d. All of the above Feedforward control systems have this limitation: 6. a. b. c. d. Effect of disturbance must be predicted May not generalize to other conditions Will not be accurate if the system changes All of the above

Explanation / Answer

1.d.all of the above

2.d. any of the above

3.c. stepper motor. The stepper motor is known for its property to convert a train of input pulses (typically square wave pulses) into a precisely defined increment in the shaft position. Each pulse moves the shaft through a fixed angle.

4.b.closed loop control system. In closed loop control, the control action from the controller is dependent on the process output.

5.d.all of the above

6.d.all of the above

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