ILT FINAL
Assume two ingredients are added together, processed, and then stored. This would be an example of a: a. batch process. b. continuous process. c. individual product-producing process. d. discrete product-producing process.
a. batch process.
The fundamental job of a Local Area Network (LAN) is to provide ____ between devices. a. communication c. isolation b. connections d. protection
a. communication
The illustration shows the implementation of ___ type communication connections. a. serial c. analog b. parallel d. digital
a. serial
A P1D controller must be factory-tuned to each process being controlled.
FALSE
A control loop is a control design where a controller is connected to a process in an arrangement such that any change in the process is measured and used to adjust action by the controller.
FALSE
Actuators convert physical information into electrical signals.
FALSE
Distributive control is used when several machines are controlled by one controller.
FALSE
Distributive control systems (DCS) use one controller for all the processing tasks.
FALSE
Feedback is a rarely used control function.
FALSE
Function blocks contain non-executable code.
FALSE
Similar to Ladder Logic Programming, Functional Block Diagram (FBD) programming uses power rails.
FALSE
The acronym IREF stands for internal reference.
FALSE
The pins on the left of a function block are output pins, and those on the right are input pins.
FALSE
A PID controller reduces the system error to zero faster than any other type of controller.
TRUE
A PID loop is normally tested by making an abrupt change to the setpoint and observing the controller's response rate.
TRUE
A SCADA system usually refers to a system that coordinates, but does not control processes in real time.
TRUE
A continuous process involves the flow of product material from one section of the process to another.
TRUE
A network switch or hub is required for network star topology.
TRUE
A pushbutton switch could be classified as a type of human-machine interface.
TRUE
A step change is a sudden change in an input variable in a process that is managed by a controller.
TRUE
EtherNet/IP is an open communications network based on the same protocol that is used with DeviceNet and ControlNet.
TRUE
Function blocks connections are made using wires and pins.
TRUE
HMI graphic terminal software is used to create and animate objects related to the process on the screen.
TRUE
In a batch process, a set amount of product is received and then some operation is performed on the product.
TRUE
PLCs can be fitted with I/O modules that produce PID control, or may have sufficient mathematical functions that allow PID control to be carried out.
TRUE
Sensors convert physical information into electric signals.
TRUE
Signal conditioning involves converting input and output signs into a usable form.
TRUE
The acronym OREF stands for output reference.
TRUE
The workplace of a FBD is known as a sheet.
TRUE
Trend values of graphic HMI terminals display information on process variables over a period of time.
TRUE
Two types of communications links found in PLC systems are point-to-point and network.
TRUE
Valves are frequently configured to be fail closed for safety reasons.
TRUE
Wire connectors are used to create a signal path without using a wire.
TRUE
Which of these controller types provides the fastest response to a system error? a. PID c. Proportional plus integral b. On/off d. Proportional plus derivative
a. PID
Which of the following devices could be classified as a sensor? a. Thermistor c. Solenoid b. Relay d. All of these
a. Thermistor
A(n) ___ is a device that provides the power and motion to manipulate the moving parts of a valve or damper used to control fluid flow. a. actuator c. ratio regulator b. pilot-operated regulator d. sliding stem
a. actuator
A sheet of a FBD consists of: a. function blocks joined together with wires. b. a series of input and output blocks. c. gate symbols with connecting input and output wires. d. interconnected series of blocks containing circuit schematics.
a. function blocks joined together with wires.
A diaphragm-and-spring actuator converts an air pressure change at the diaphragm into a ___. a. mechanical movement b. voltage c. current d. pneumatic signal
a. mechanical movement
A distributive control system (DCS): a. permits the distribution of the processing task among several controllers. b. always utilizes a single large computer. c. will stop the whole process if one control element fails. d. is the least flexible type of control system.
a. permits the distribution of the processing task among several controllers.
38. The set point for a control system refers to: a. the input that determines the operating point for the process. b. a process variable that is monitored continually. c. a process error that is uncontrolled. d. all of these.
a. the input that determines the operating point for the process.
Network ____ is refers to the physical layout of devices on a network. a. topology c. reliability b. functionality d. all of these
a. topology
The type of network connection topology shown is: a. Bus c. Tree b. Star d. Ring
b. Star
For the FBD shown, the dash line indicates: a. no type of data are present. b. a Boolean value is present c. an integer or real value is present d. a combination of data types are present
b. a Boolean value is present
A(n) ___ is a control system that provides feedback to a controller on the state of a process variable. a. control loop c. setpoint b. closed loop d. offset
b. closed loop
With reference to FBD, the wire connected between the DN and Reset pins: a. represents a DINT signal path. b. creates a feedback loop. c. establishes data latching. d. all of these.
b. creates a feedback loop.
A(n) ___ is the tubing or piping connection that connects flowmeter taps to any differential pressure instruments. a. flange tap c. pipe tap b. impulse line d. vena contracta tap
b. impulse line
With reference to IREF shown, if the pushbutton is momentarily actuated the data in the IREF: a. changes immediately. b. is latched in for one scan. c. executes immediately. d. executes after a delay of one scan.
b. is latched in for one scan.
A(n) ___ is a primary flow element consisting of a thin circular metal plate with a sharp-edged round hole in it and a tab that protrudes from the flanges. a. flow nozzle c. pitot tube b. orifice plate d. venturi tube
b. orifice plate
A(n) ___ is a device used to ensure positive position of a valve or damper actuator. a. calibrator c. actuator b. positioner d. characteristic cam
b. positioner
SCADA is an acronym that stands for: a. security control and data acquisition. b. supervisory control and data acquisition. c. security control and digital acquisition. d. supervisory control and analog acquisition.
b. supervisory control and data acquisition.
For the FBD shown, the solid line indicates: a. no type of data are present. b. a Boolean value is present. c. an integer or real value is present d. a combination of data types are present
c. an integer or real value is present
A ___ transducer is a device that can convert an electronic controller output signal into a standard pneumatic output. a. pneumatic-to-current (P/I) b. voltage-to-pneumatic(V/P) c. current-to-pneumatic (I/P) d. pneumatic-to-voltage (P/V)
c. current-to-pneumatic (I/P)
A Functional Block Diagram (FBD) is a ____ programming language. a. textual c. graphical b. contact and coil d. schematic
c. graphical
The EtherNet/IP protocol: a. is a proprietary network. b. will not operate with either DeviceNet or ControlNet protocol. c. is based on the Control and Information Protocol. d. all of these.
c. is based on the Control and Information Protocol.
A PID controller: a. is tuned using a signal generator. b. is factory-tuned for optimum performance. c. must be custom-tuned to each process. d. both a and b.
c. must be custom-tuned to each process.
A continuous process is: a. one that never shuts down. b. used only for simple tasks. c. one in which raw materials enter one end of the system and the finished product comes out the other end d. used only with computers.
c. one in which raw materials enter one end of the system and the finished product comes out the other end
A ___ variable is a dependent variable that is controlled in a control system. a. manipulated c. process b. control d. static
c. process
The error signal in a closed-loop control system is: a. always a positive value. b. always a negative value. c. the difference between the set point and feedback signal. d. the sum of the set point and feedback signal.
c. the difference between the set point and feedback signal.
Which of the following devices could be classified as an actuator? a. Control valve c. Servo motor b. Electric brake d. All of these
d. All of these
A(n) ___ is a pipeline restriction that causes a pressure drop used to measure flow. a. venturi tube c. flow nozzle b. orifice plate d. all of the above
d. all of the above
Common requirements for an actuator include ___. a. speed c. precision b. power d. all of the above
d. all of the above
HMIs allow operators to ____ the application: a. control c. diagnose b. monitor d. all of these
d. all of these
Components of a control system may include: a. sensors. b. actuators. c. Human-Machine Interface (HMI). d. all of these.
d. all of these.
For the BAND function block shown: a. tag name for the block is placed above it. b. 1 and 0 next to the inputs and output identifies their logical state c. dots on the pins indicate BOOL type data is required. d. all of these.
d. all of these.
For the SCADA system shown, the host computer: a. monitors the process. b. sends commands to the PLCs. c. stores data automatically. d. all of these.
d. all of these.
The OREFs shown: a. are used to send a value to an output device or tag. b. are used to receive a value from an input device or tag c. must be contain tags d. both a and c
d. both a and c
The IREFs shown in the FBD: a. are used to send a value to an output device or tag. b. are used to receive a value from an input device or tag c. must be contain tags d. both b and c
d. both b and c
