Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Which of the following is an application of a relay?
a. | Performing control logic | d. | All of these | b. | Seal-in
circuit | e. | None of
these | c. | Energizing a fluid power valve solenoid |
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2.
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Which of the following is not a component of a relay?
a. | Coil | c. | Valve | b. | Contacts | d. | Spring |
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3.
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It is standard practice in industry to carry the flow of electricity to a
solenoid through
a. | uninsulated wires. | c. | shielded cable. | b. | relay contacts. | d. | a capacitor. |
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4.
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Turning outputs on or off through relay contacts is called
a. | control logic. | d. | All of these | b. | bypass logic. | e. | None of these | c. | indirect
actuation. |
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5.
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An example of memory logic by a control relay is
a. | bypass logic. | d. | All of these | b. | manual override. | e. | None of these | c. | seal-in
circuit. |
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6.
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One method of deenergizing a seal-in circuit is to use
a. | a manual overide. | c. | a solenoid. | b. | another relay. | d. | a stop
pushbutton. |
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7.
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A stop pushbutton is basically just a
a. | normally open pushbutton switch. | d. | All of these | b. | normally closed
pushbotton switch | e. | None of
these | c. | panic switch |
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8.
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Which of the following statements describes a limit switch?
a. | It is a switch used to sense the position of a machine member. | d. | All of the
above | b. | It is a simple, low cost, reliable device. | e. | None of the above | c. | It is the most
frequently-used input device on automatic machines. |
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9.
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Which of the following is not a component of a limit switch?
a. | Actuating mechanism | d. | All of these | b. | Optical sensor | e. | None of these | c. | Contacts |
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10.
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A control circuit that uses limit switches to sequence a series of events is
called a(n)
a. | event sequencing circuit. | c. | sychronized
circuit. | b. | follow the leader circuit. | d. | stair-step circuit |
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11.
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An example of a manually-operated single cycle reciprication circuit is a
a. | drill | d. | All of these | b. | lathe | e. | None of these | c. | punch
press |
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12.
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A circuit designed to turn off an output after a step is performed is called
a(n)
a. | event deenergizing circuit. | d. | All of these | b. | kill
circuit. | e. | None of
these | c. | overload circuit. |
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13.
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Fully automated machines require a
a. | single-cycle cylinder circuit. | d. | All of these | b. | stop
circuit | e. | None of
these | c. | continuous-cycle cylinder circuit. |
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14.
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A limit switch used to sense if the guard is in place on a machine is called
a(n)
a. | idot switch. | d. | All of these | b. | safety interlock switch. | e. | None of these | c. | kill
switch. |
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15.
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Which of the following is a function of a safety intelock switch?
a. | It stops the machine if the guard is removed. | d. | All of these | b. | It prevents machine
startup if the guard is not in place | e. | None of these | c. | It keeps the operator from moving machinery
parts. |
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Matching
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Segment 1
a. | coil | d. | General purpose | b. | spring | e. | are
not | c. | relay |
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16.
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The memory logic in a control circuit is caused by a(n) ____________.
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17.
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An electromechanical relay has three major components: a(n) ________, contacts,
and a spring.
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18.
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AC and DC relay coils ________ interchangeable.
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19.
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________ relays are designed for light-duty industrial applications.
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20.
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The ____________ returns the relay contacts to their normal state.
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Segment 2
a. | Control | d. | contacts | b. | stop | e. | memory | c. | Seal-in |
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21.
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It is standard practice in industry to carry electricity to a solenoid through
a set of relay ___________.
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22.
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_________ logic is when a relay causes outputs to be on or off based on certain
input conditions.
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23.
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A(n) ___________ circuit is a wiring method that causes the relay to continue
to energize itself after the momentary input is removed.
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24.
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One method of de-energizing the relay coil is with a(n) _______
pushbutton.
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25.
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The most important function of a control relay is __________ logic.
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Segment 3
a. | detect | e. | N.C. | b. | sequence | f. | limit | c. | operated or
held | g. | contacts | d. | starting |
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26.
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The _________ switch is by far the most frequently used input device on
automatic machines.
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27.
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The two main components of a limit switch are the actuating mechanism and the
___________.
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28.
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Limit switches are most commonly used to ___________ a series of
events.
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29.
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The limit switch is mounted so that it can _________ the position of a machine
member such as a cylinder.
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30.
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Limit switches can have N.O and _________ types of contacts.
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31.
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In ladder diagrams, limit switches should always be shown in the state they are
in when the circuit is in its ___________ position.
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32.
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The following limit switch symbol shows a N.C. limit switch in its ________
condition.
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Segment 4
a. | operator | d. | two | b. | N.C. | e. | relays | c. | punch | f. | guard |
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33.
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A(n) _________ press is an example of single-cycle cylinder
reciprication.
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34.
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To accomplish continuous-cycle cylinder reciprocation, you will need two
__________ and two limit switches.
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35.
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It is common practice to place a limit switch on a machine to sense if the
_________ is in place and to prevent startup of the machine if it is not.
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36.
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The guard keeps the ________ away from the moving parts of the press.
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37.
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A continuous-cycle reciprocation requires ________ limit switches.
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38.
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A limit switch with _________ contacts is used in a reciprocation circuit to
turn off an output.
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