Bell 412 Electrical System (Flight Safety Manual)
Test-Questions with Correct Solutions
What is the primary type and source of electrical power in the Bell 412?
A. 24-VDC power from one battery
B. 28-VDC power from one starter-generator
C. 28-VDC power from two starter-generators
D. 115-VAC power from two inverters
28-VDC power from two starter-generators
2. Which electrical buses distribute DC power to the using circuits?
A. No.1 and No.2 main DC buses
B. No.1 and No.2 essential DC buses
C. No.1 and No.2 non-essential DC buses
D. All of the above plus No.1 and No.2 emergency buses
All of the above plus No.1 and No.2 emergency buses
3. Which of the following methods is used to assist the pilot in identifying and separating
electrical circuit breakers on the overhead console?
A. Separating No.1 and No.2 buses and system breakers
B. Bracketing circuit breakers under main headings
, C. Marking bus dependency symbols around circuit breakers
D. All the above
All the above
4. What function do the BATTERY BUS switches provide?
A. To activate the battery bus relays
B. To connect the two batteries to the battery bus
C. To connect the battery bus to the emergency buses
D. To activate the bus control relays
To activate the battery bus relays
5a. What is the purpose of the EMERG LOAD switch on SNs 33001 through 33107?
A. Load-shedding in the event of battery failure
B. Load-shedding in the event of dual generator failure
C. Load-shedding in the event of emergency bus failure
D. None, the switch is inoperable
None, the switch is inoperable
5b. What is the purpose of the EMERG LOAD switch on SNs 33108 and subsequent?
A. Load-shedding in the event of dual inverter failure
B. Load-shedding in the event of battery failure
Test-Questions with Correct Solutions
What is the primary type and source of electrical power in the Bell 412?
A. 24-VDC power from one battery
B. 28-VDC power from one starter-generator
C. 28-VDC power from two starter-generators
D. 115-VAC power from two inverters
28-VDC power from two starter-generators
2. Which electrical buses distribute DC power to the using circuits?
A. No.1 and No.2 main DC buses
B. No.1 and No.2 essential DC buses
C. No.1 and No.2 non-essential DC buses
D. All of the above plus No.1 and No.2 emergency buses
All of the above plus No.1 and No.2 emergency buses
3. Which of the following methods is used to assist the pilot in identifying and separating
electrical circuit breakers on the overhead console?
A. Separating No.1 and No.2 buses and system breakers
B. Bracketing circuit breakers under main headings
, C. Marking bus dependency symbols around circuit breakers
D. All the above
All the above
4. What function do the BATTERY BUS switches provide?
A. To activate the battery bus relays
B. To connect the two batteries to the battery bus
C. To connect the battery bus to the emergency buses
D. To activate the bus control relays
To activate the battery bus relays
5a. What is the purpose of the EMERG LOAD switch on SNs 33001 through 33107?
A. Load-shedding in the event of battery failure
B. Load-shedding in the event of dual generator failure
C. Load-shedding in the event of emergency bus failure
D. None, the switch is inoperable
None, the switch is inoperable
5b. What is the purpose of the EMERG LOAD switch on SNs 33108 and subsequent?
A. Load-shedding in the event of dual inverter failure
B. Load-shedding in the event of battery failure
