True/False
Indicate whether the
statement is true or false.
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1.
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Electronic control is prevalent in all types of industrial manfacturing.
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2.
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PLC’s monitor output signals and generate input signals.
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3.
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There are two types of control systems.
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4.
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Open loop systems use sensors that determine what is happening with the
load.
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5.
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Response time, accuracy, and precision are of great importance with elctronic
control systems.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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6.
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The following is an example of a ____________.  a. | PLC | d. | open loop system | b. | Transducer | e. | None of the above | c. | closed loop
system |
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7.
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The following is and example of a ____________.  a. | closed loop system | d. | deadband eliminator | b. | open loop system | e. | pneumonoultramicropicsilicovolcanoconiosis | c. | mainframe |
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Completion
Complete each
statement.
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8.
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A PLC is an _____________ computer that has sophisticated input/output
capabilities.
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9.
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_________ are the interface between the physical components and the
electronics.
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10.
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The __________ signal is the input that instructs the valve to produce a desired
output.
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11.
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In ________ loop control, the actual result being produced by the actuator is
read by sensor.
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12.
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Open and closed loop control are concepts that apply to ______ control system,
not just those found in fluid power.
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13.
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Solenoids are ____________ that are shifted by electrical current.
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14.
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Solenoids are also commonly used to shift two-way and three-way directional
_______ valves, as well as some types of pressure control valves.
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15.
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Hydraulic solenoid valves are usually of the wet ___________ type, which means
that the hydraulic fluid is allowed to circulate through the solenoid case.
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16.
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Solenoids are often used to actuate _________ valves as well as hydraulic
valves.
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17.
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Proportional valves are similar to solenoid valves in that they are ____________
controlled.
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18.
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The most commonly used position transducer for proportional valves is a linear
variable differential ______________ (LVDT).
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19.
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Spool ________ is the amount that the spool land overlaps the pressure port when
in the closed neutral position.
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20.
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A servo valve is another type of electronically controlled valve that produces
output proportional to an ___________ input signal.
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21.
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A more efficient way to control flow and pressure is to control it at the
________: the pump.
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22.
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In electrohydraulic pump control, the pressure and flow output of the pump are
adjusted to match the _______ requirements.
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Matching
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a. | Double solenoid, three position | d. | Single solenoid | b. | Servo
valve | e. | Proportional
valve | c. | Double solenoid, two position |
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23.
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24.
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25.
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26.
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27.
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a. | Accuracy | c. | Precision | b. | Response time |
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28.
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The difference in time between when a desired result is commanded and when it
is actually achieved.
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29.
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A measure of how close the actual result is to the desired result.
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30.
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The measure of repeatability.
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