Boeing 737 Systems-Electrical (CDW)
Questions With Correct Answers 2024
1. With Standby Power OFF light illuminated, you placing the standby pow-
could power the standby busses directly from er switch to BAT
the battery by
2. DC power is supplied by . transformer rectifier
units, the battery charg-
er, and the battery
3. Normally, the AC electrical system is run . isolated
4. The static inverter is powered by . battery
5. The Ground Service Switch is located on the forward attendant
. panel
6. The DC Cross Bus Tie Relay will open . at glideslope capture
during a flight director or
autopilot ILS approach
7. Circuit breakers are allowed to be pulled and only if specified in a QRH
reset . procedure
8. After engine start, the crew forgets to put the generators are automati-
generators on line and uses the APU to power cally placed on line
the Transfer Busses for takeoff. If the APU fails,
the .
9. On the ground with the APU powering the elec- OFF
trical systems, the APU GEN OFF BUS light will
be
10. When moved to OFF, the BUS TRANSFER switch isolate the AC and
will . DC Busses on Electrical
System 1 from the AC
and DC Busses on Elec-
trical System 2
11. In a normally operating AC electrical system, if and if a generator subse-
the Bus Transfer Switch is moved to OFF, . quently fails, the bus ties
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, Boeing 737 Systems-Electrical (CDW)
Questions With Correct Answers 2024
will not close to transfer
power
12. If the Standby Power "OFF" light illuminates, it -the AC Standby Bus
means is/are not powered. -the DC Standby Bus
-the Battery Bus
(one or more of the
above)
13. With standby electrical power only, the Captain -LOC only
will be able to fly instrument approaches. -VOR
-ILS
(All of the above)
14. The AC standby bus can be powered by if the battery (through the
its normal power source fails. static inverter)
15. During an ILS approach, the cross bus tie re- prevent single bus fail-
lay automatically opens at glideslope capture to ure from affecting both
. navigation receivers and
flight control computers
16. With a normally operating electrical system, removes power to the
placing the Battery Switch OFF . Battery Bus and the
Switched Hot Battery
Bus
17. The DC Standby Bus can be powered by . TR1, TR2, TR3, and the
battery
18. Under what conditions can External power be No condition. The electri-
used to power one AC Transfer Bus, and the APU cal system will not allow
the other Transfer Bus? it.
19. What does an illuminated ELEC light, on the AC A Standby Power or DC
and DC Metering Panel, mean? system fault has oc-
curred.
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