21. In a control system using a variable frequency drive, the speed of the load is manually controlled by an operator using a dial on the control system. This is an example of ? control. Oa. closed-loop Ob. open-loop Oc. ramp-down Od. ramp-up
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- What should the parameters K and K1 be in order for the following (finite value) steady-state errors of the closed loop control systems to be ess = 0.02?An attenuator used in control systems unit is also known as _________? A. Summing amplifier B. Deriative gain C. Variable DC Voltage source D. Potentiometerplease i need help quickly n 57 The ARDUINO IDE stands for. d a. Integrated development environment out of b. None of these O c. Integrated drive electronics O d. Instructional development environment 58 What does the following ARDUINO command do? analogWrite (9, 63) a. Sets the PWM duty cycle to 25% ut of b. Sets the PWM duty cycle to 75% c. Sets the PWM duty cycle to 50% d. Sets the PWM duty cycle to 30%
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- 8. What instruction would you select for each of the following discrete input field devices to accomplish the desired task? (State the reason for your answer.) a. Turn on a light when a conveyor motor is running in reverse. The input field device is a set of con- tacts on the conveyor start relay that close when the motor is running forward and open when it is running in reverse. b. When a pushbutton is pressed, it operates a so- lenoid. The input field device is a normally open pushbutton. c. Stop a motor from running when a pushbutton is pressed. The input field device is a normally closed pushbutton. d. When a limit switch is closed, it triggers an instruc- tion ON. The input field device is a limit switch that stores a 1 in a data table bit when closed.9.a. A servo system is oscillating at standstill. This is an indication thatA. the following error limit has been exceeded.B. a motor winding is open.C. the system gain is too high. 9.b. In a DC servo motor system, the tachometer feeds back a voltage that’s proportional to motor speed.Where does this voltage go to?A. The interpolator cardB. The driverC. The CPU in the main controller14-Which is the most effective and currently used method in asynchronous motor speed control methods?A) changing the number of polesB) changing voltage and frequency togetherC) changing the voltage frequencyD) changing the applied voltage