Electrical Power System Flashcards
- A good battery should supply power to the hot battery bus and the emergency bus for approximately:
C. 30 minutes
- The crossfeed bus serves as:
D. A bus tie for the hot battery bus, emergency buses and the feed buses
- In flight, with the generators online, the battery is isolated from any charging source when the BATT switch is in:
D. Both B and C (OFF / EMER)
- If manual termination of a start sequence is desired, the switch to press is:
B. START DISG
- The voltage read on the voltmeter with the VOLTAGE SEL switch in BATT is sensed from the:
C. Hot battery bus
- If the generators are not operating, the voltmeter reads battery voltage when the BATT switch is in:
D. Both A and C (BATT/EMER)
- The light in each engine start button illuminates to indicate:
C. Closing of the start relay
- The generator field relay opens when:
D. All of the above:
A. An internal feeder fault is sensed.
B. An overvoltage condition is sensed.
C. An ENG FIRE switchlight is activated.
- If a battery start is intended, the generator switches should be placed to:
D. ON
- With the battery as the only source of power and the BATT switch OFF, the bus(es) powered is (are):
B. Hot battery bus
With the battery as the only source of power and the BATT switch in EMER, the following bus(es) are powered:
B. Emergency bus, crossfeed bus, hot battery bus
- With the battery as the only source of power and the BATT switch in BATT, the following condition exists:
A. All DC buses are powered for 10 minutes.
- The item that receives power directly from the hot battery bus is:
B. Nose baggage compartment light
- In flight, an engine start accomplished with the start button (not a windmilling start):
C. Is a battery start as the generator assist is disabled in flight to protect the operating generator.
- Regarding the engine starting sequence (battery start on the ground):
D. It is terminated normally by the 45% N2 speed-sensing switch on the starter-generator.
- The correct statement is:
D. All of the above.
A. The illumination of the engine START DISG button is a function of the panel lights control NIGHT-DIM switch.
B. The generator switches are placed in the OFF position for an EPU start.
C. A failed left 225 amp current limiter prevents starting of the left engine.
- With the electrical system operating normally (both generators on the line with the
BATT switch in BATT):
A. The generator control units (GUs) serve to automatically regulate, paral-lel, and protect the generators.
- Placing the BATT switch in EMER with the generators online:
B. Causes the emergency bus to be powered by the battery.
- Loss of both generators:
D. R and L GEN OFF annunciators, MASTER CAUTION RESET and MASTER WARNING RESET switchlights illuminate.
- During engine start, the speed sensing switch terminates the start sequence thus removing power from the:
B. Electric fuel boost pump, ignitors, and
the starter-generator.
- The BATT O’TEMP annunciator comes on steady and remains steady after the MASTER WARNING RESET switchlight is depressed:
B. Move the BATT switch to EMER and
observe the volts and amps.
- Both engines are started and the AFT J-BOX LMT annunciator is observed illuminated:
C. A 225 amp current limiter is blown and must be repaired before flight.
- The battery DISCONNECT switch:
D. All of the above.
A. Is used for a stuck start relay.
B. Is used for a stuck battery relay during battery overtemp.
C. Can only be used when the BATT switch is in BATT.
