2-42. To protect from accidental activation of selected
keys and switches, what device is used with
selected keys and switches?
1. Horn
2. Guard
3. Circuit breaker
4. Light-emitting diode
2-43. Switches have which of the following functions?
1. To activate a function
2. To turn a unit on/off
3. To set a parameter
4. Each of the above
2-44. A key switch you depress to activate a function
2-45.
2-46.
and depress again to deactivate the function is
called a/an
1. momentary-action key switch
2. alternate-action key switch
3. three-position key switch
4. on/off key switch
A key that repeats the function continuously while
being held down is which of the following types of
keys?
1. Momentary-action key
2. Alternate-action key
3. Toggle key
4. On/off key
Switches that have several positions the operator
can select by turning a knob are which of the
following types of switches?
1. Rotary switches
2. Pushbutton switches
3. Alternate-action toggle switches
4. Momentary-action toggle switches
2-47. All of the following are characteristics of
thumbwheel switches except which one?
1. They have alphanumeric characters built in
2. Each position is locked until another position
is selected
3. The position values are usually marked on the
controlling unit cover
4. The positions are selected by dialing the
switch
2-48. Pushbutton switches may not have indicators.
1. True
2. False
2-49. On toggle switches, which of the following can be
2-50.
2-51.
2-52.
a use of the neutral position?
1. To interact with software
2. To set a parameter
3. To disable a locked up/down position
4. All of the above
Alternate-action toggle switches may have which
of the following positions?
1. Permanent up and return to neutral only
2. Permanent up and down only
3. Either permanent up and return to neutral or
permanent up and down, depending on design
4. On and off
Momentary-action/contact, two-position toggle
switches are normally used for which of the
following purposes?
1. To turn the unit on
2. To initiate an operation
3. To provide status information
4. To turn the unit off
On a three-position toggle switch, the center
position may be used for which of the following
purposes?
1. To set a parameter only
2. To disable the locked up/down position only
3. Either to set a parameter or to disable the
locked up/down position, depending on the
function
4. To provide status information
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