4-44.
Excessive fluctuation in the
dc voltage applied to the
hardware can be caused if
the line voltage is 90
percent or less of nominal
for more than what minimum
number of milliseconds?
1.
7
2.
6
3.
5
4.
4
4-45.
Power fluctuations in line
voltage cause unpredictable
results in which of the
following components?
1.
Logic only
2.
Hardware only
3.
Data transfer only
4.
Logic, hardware, and
data transfer
4-46.
In an AIS facility, the
effects of internal power
fluctuations can be
minimized in which of the
following ways?
1.
Grounding the CPU
2.
Isolating the AIS
hardware from other
facility loads
3.
Wiring all components in
parallel
4.
Wiring each component
with a circuit breaker
4-47.
The technique of connecting
the AIS facility to more
than one utility feeder has
more protection value when
the feeders are connected in
what manner?
1.
To the same junction box
2.
From the same utility
pole
3.
To different power
substations
4.
To different utility
meters
4-48.
An uninterrupted power
supply (UPS) consists of a
solid-state rectifier that
performs which of the
following functions?
1.
Drives a solid-state
inverter only
2.
Keeps batteries charged
only
3.
Drives a solid-state
inverter and keeps
batteries charged
4.
Synthesizes alternating
current
4-49.
The UPS battery supply can
support a facility load for
a maximum of how many
minutes?
1.
35
2.
40
3.
45
4.
50
4-50.
The control circuitry for a
static transfer switch
performs which of the
following functions?
1.
Senses variations in
frequency
2.
Senses an overcurrent
condition
3.
Switches the load to the
alternate power source
4.
Stops the flow of power
4-51.
Using multiple, independent
UPS units can provide which
of the following benefits?
1.
Power consumption is
lowered
2.
Each unit can be
switched offline if it
fails
3.
The metering of
component power
consumption is
facilitated
4.
All of the above
37
