Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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A combination of components that work together to form a unit is a(n)
____.
A. | system | B. | subsystem | C. | armature | D. | cycle |
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2.
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A(n) ____ system transfers power from one point to another through mechanical
motion that is used to do work.
A. | sensing | B. | optoelectronic | C. | timing | D. | electromechanical |
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3.
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When subsystems are combined, the result is referred to as a ____.
A. | cycle | B. | synthesized system | C. | transmission
path | D. | digital system |
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4.
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The process of converting alternating current power to direct current is called
____.
A. | work | B. | control | C. | rectification | D. | cycle timing |
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5.
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____ devices operate within the transmission path and alter the flow of
power.
A. | Control | B. | Load | C. | Cycle | D. | Commutator |
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6.
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The ____ is a subsystem that displays information about operating conditions at
points throughout the system.
A. | timing | B. | control | C. | channel | D. | indicator |
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7.
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Control in mechanical systems is accomplished by changing ____.
A. | pressure | B. | direction | C. | speed | D. | All of the
above. |
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8.
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In electrical systems, a ____ system signals a response to a particular form of
energy.
A. | timing | B. | sensing | C. | control | D. | power |
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9.
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A(n) ____ system provides a lapse in time before the load device becomes
energized.
A. | cycle timing | B. | interval timing | C. | delay
timing | D. | All of the above. |
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10.
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The ____ unit of an industrial robot determines its flexibility and
efficiency.
A. | timing | B. | control | C. | sensing | D. | power |
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11.
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In a closed-loop system, the signal or data that provides information about
interaction between the control unit and the load is called ____.
A. | feedback | B. | cycle timing | C. | comparator | D. | slip |
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12.
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The ____ compares the feedback signal from the controlled element to a reference
signal or standard.
A. | end effector | B. | rotor | C. | controller | D. | comparator |
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13.
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The rotary motion, or turning force, of an electric motor is called ____.
A. | work | B. | friction | C. | torque | D. | feedback |
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14.
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The ____ is the rotating component of a motor and includes the armature, shaft,
and associated parts.
A. | stator | B. | rotor | C. | commutator | D. | detector |
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15.
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The coil wires wrapped around the electromagnets in the stator are called
____.
A. | field windings | B. | brushes | C. | flux | D. | mechanical
fuses |
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16.
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As the mechanical load on a dc motor increases, the motor speed ____.
A. | increases | B. | decreases | C. | stays the
same | D. | cannot be measured |
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17.
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A ____ dc motor has two sets of field windings.
A. | shunt-wound | B. | permanent-magnet | C. | series-wound | D. | compound-wound |
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18.
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A ____ motor has a solid rotor, called a squirrel cage rotor.
A. | universal | B. | three-phase synchronous | C. | single-phase
induction | D. | dc stepping |
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19.
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The difference between the synchronous speed and the rotor speed is called
____.
A. | torque | B. | slip | C. | cemf | D. | flux |
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20.
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____ systems are machines that change the position or speed of a mechanical
object in response to system feedback.
A. | Servo | B. | Synthesized | C. | Synchronous | D. | Timing |
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21.
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A(n) ____ motor is comprised of a rotor and a stator assembly, and contains no
brushes, commutators, or slip rings.
A. | universal | B. | dc stepping | C. | induction | D. | synchronous |
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22.
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DC stepping motors are primarily used to change electrical pulses into
____.
A. | dc power | B. | feedback signals | C. | rotary
motion | D. | input commands |
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True/False
Indicate whether the
statement is true or false.
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23.
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Work occurs when energy is transformed into mechanical motion, heat, light,
chemical action, or sound.
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24.
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The most common source of power for synthesized systems is alternating current
(ac).
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25.
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Single-phase ac power consists of three alternating currents that vary by
120°.
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26.
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Examples of loads include digital meters, pressure gauges, tachometers, and
thermometers.
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27.
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The transmission path provides a channel for the transfer of energy.
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28.
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In a mechanical system, control is accomplished by changing pressure, direction,
force, and speed.
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29.
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Timing systems convert electrical energy into mechanical motion.
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30.
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Open-loop control systems use sequencers and mechanical stops to control the end
point positions of the robot arm.
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31.
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A digital system is a set of components that work together to process numeric
information.
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32.
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In an electric motor, the armature is an electromagnet.
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33.
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The counter electromotive force flows against the voltage coming into a dc
motor.
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34.
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Horsepower is a measure of the amount of current produced over a specified
amount of time.
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35.
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In a series-wound dc motor, the armature and field circuits are connected in a
series arrangement.
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36.
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In bifilar construction, three separate wires are simultaneously wound into the
stator coil slots.
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Completion
Complete each
statement.
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37.
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In a mechanical system, ______________________________ measure physical
quantities, such as pressure, speed, and force.
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38.
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The ______________________________ of a sensing system outputs a signal that is
used to control the load device.
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39.
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The ______________________________ receives data from both the input source and
the output device, and determines if a correction signal should be sent to the actuator.
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40.
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A(n) ______________________________ motor is the only dc motor that can also be
operated using ac power.
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41.
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______________________________ occurs when energy is transformed into mechanical
motion, light, heat, chemical action, or sound.
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42.
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In an automated system, the part(s) designed to produce work is referred to as
the ______________________________.
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43.
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______________________________ timing systems may include both interval and
delay timing to provide energizing action in an operational sequence.
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44.
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Flexible, fiber-optic rods that transfer light energy from its source to distant
locations are called ______________________________.
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45.
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As the armature of a dc motor rotates, it generates its own voltage called
______________________________.
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46.
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The ______________________________ rating of a motor represents the power of the
motor.
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47.
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Examples of ______________________________ in automated systems include electric
motors, heating systems, lighting systems, alarms, and mechanical actuators.
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48.
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A ______________________________ open-loop system simply turns the system off or
on.
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49.
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The ______________________________ is the rotating part of a motor that creates
torque.
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50.
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Changes in the field current result in corresponding changes in the
______________________________ of the electromagnetic field.
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Matching
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Match each system listed with its function or description. A. | Timing systems | B. | Digital systems | C. | Sensing
systems | D. | Synthesized systems | E. | Mechanical systems | F. | Control
systems | G. | Servo systems |
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51.
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Continually at work making adjustments that alter machine operation.
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52.
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Signal a response to a particular form of energy.
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53.
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Produce some form of mechanical motion.
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54.
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Ensure that all actions of an operation occur at a precisely defined
interval.
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55.
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Machines that change the position or speed of a mechanical object.
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56.
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Numeric instructions are changed into a series of on/off electrical
signals.
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57.
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The combination of multiple subsystems.
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Identify the basic parts of a dc motor.
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58.
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Mounting
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59.
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Field pole
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60.
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Brush-commutator assembly
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61.
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Stator
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62.
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Rotor
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