ATA 24 (B777 AMM Part 1)

Question 1

The backup generators are: (B2)

a. an IDG type

b. a constant frequency AC generator type

c. a variable-speed, variable-frequency type

Answer 1

C

Question 2

The standby power switch OFF position makes the static inverter stay off:
(B2)
a. any time.
b. on the ground
c. In the air.

Answer 2

B

Question 3

The P110 left power management panel and the P210 right power management panel control load shedding. These panels: (B2)

a. can shed loads independently only

b. always operate together (interpanel operation)

c. can shed loads independently or operate together dependent on the availability of the powersources

Answer 3

C

Question 4

The ELMS can possibly shed and restore all loads four times in about one minute. If you use an external power source with: (B2)

a. less than a 60 KVA capacity at an external power receptacle,

b. less than a 90 KVA capacity at an external power receptacle

c. less than a 180 KVA capacity at an external power receptacle

Answer 4

B

Question 5

The primary sources of electrical power are: (A1, B1, B2)

a. The integrated drive generators (IDGs) only

b. The integrated drive generators (IDGs) and the APU generator

c. The integrated drive generators (IDGs), the APU generator and External ground power

Answer 5

(A)

Question 6

IDG can not be reconnected at the line maintenance if disconnected:(B1, B2)

a. accidentally by flight or ground crew

b. automatically due the IDG oil gets too hot.

c. manually due to low oil pressure

Answer 6

(B)

Question 7

The IDG oil level data on the electrical maintenance page and the sightglass is not accurate until you wait a minimum of: (B1, B2)

a. 5 minutes after engine shutdown

b. 10 minutes after engine shutdown

c. 30 minutes after engine shutdown

Answer 7

(A)

Question 8

The maintenance page will show NORMAL when the backup generator is shutdown, if: (B1, B2)

a., the backup generator oil level is too low (If oil does not cover the underfill sensor)

b. the backup generator oil level is too high (if oil covers the two - underfill and overfill -sensors).

c. oil covers the underfill sensor, but not the overfill sensor of the backup generator

Answer 8

(C)

Question 9

The primary power source for the backup converter is: (B1, B2)

a. the left backup generator.

b. the right backup generator

c. alternatively between two backup generators at next power up

Answer 9

(B)

Question 10

The OFF light on the BACKUP GEN switch comes on when: (B1, B2)

a. Engine fire switch is pulled out

b. Backup generator converter is faulty

c. GCU is faulty

Answer 10

(A)

Question 11

For the main ac electrical power generation system, there are: (B2)
a. two replacement tests
b. three replacement tests
c. four replacement tests

Answer 11

(C)

Question 12

To do operational test for the backup electrical power system, you must: (B2)
a. use the ground power unit
b. operate the engine
c. start the APU

Answer 12

(B)

Question 13

When other power sources are not available, supply dc power to important equipment will be from: (B2)

a. The main battery

b. The main battery components, including Battery charger

c. possibly the APU battery components

Answer 13

(B)

Question 14

For fiber nickel-cadmium (FNC) batteries: (B1, B2)

a. Maintenance is required at A check interval

b. Maintenance is required at C check interval

c. No maintenance is necessary

Answer 14

(C)

Question 15

The due care must be taken when replacing the main battery on the aircraft, because when no other power is on the airplane: (B2)

a. the hot battery bus supplies power to the static random access memory (SRAM) of the AIMS.

b. the database of the FMS will be erased

c. the ADIRU alarm will sound.

Answer 15

(A)

Question 16

The cell imbalance condition occurs when (B2)

a. the voltage of the first 10 battery cells is different from one half of the battery voltage

b. the charging current is higher than 100 A

c. the Overheat switch closed (160 oF (70 oC))

Answer 16

(A)

Question 17

The four TRUs normally get power from: (B2)

a. the main AC buses
b. the transfer buses
c. the backup generators

Answer 17

(B)

Question 18

Standby DC power comes from: (B1, B2)

a. either the RAT generator or the main battery

b. either the backup generators or the main battery main battery

c. either the hot battery bus or the main battery

Answer 18

(A)

Question 19

The static inverter is an alternative power source for the AC standby bus and supplies: (B2)
a. single phase, 26V AC power
b. single phase, 115v ac power.
c. three-phase, 115v ac power

Answer 19

(B)

Question 20

The RAT can be deployed automatically when: (B1, B2)

a. the airplane is in the air and all hydraulic power systems unpressurised for more than 15seconds

b. the airplane is in the air and the two transfer buses do not have power for more than 15seconds

c. the airplane is in the air and the AC standby bus does not have power for more than 15
seconds

Answer 20

(B)

Question 21

Which of the FCDC power supply assemblies (PSA) does not get power from Hot battery bus? (B2)
a. The left PSA
b. The right PSA
c. The center PSA

Answer 21

(B)

Question 22

To prevents the FCDC loads from draining the main battery and the related FCDC battery, if you replace a primary flight computer (PFC), before removing power from the airplane you must open: (B2)

a. the related FCDC circuit breakers

b. the battery interlock circuit breaker of the related PSA.

c. the related PSA circuit breakers

Answer 22

(B)

Question 23

The external power panel has two external power receptacles with the forward receptacle is for: (B2)

a. primary external power

b. secondary external power.

c. either primary or secondary external power.

Answer 23

(A)

Question 24

The ground handling AC bus can NOT be supplied from: (B1, B2)
a. the APU generator
b. primary external power
c. secondary external power

Answer 24

(C)

Question 25

No-Break Power Transfers between the external power sources and the IDGs or APU generator is coordinated by: (B1, B2) a. the BPCU b. the related GCU c. the APU controller

Answer 25

(A)

Question 26

The CONNECTED light above each receptacle in external power panel indicates that:n(B1, B2) a. the related external power is selected in the flight deck b. ground service bus is connected c. the power quality is good

Answer 26

C

Question 27

To use secondary external power, you must: (B1, B2) a. connect the primary external power. b. push the battery switch on c. connect the primary external power or push the battery switch on

Answer 27

(C)

Question 28

During autoland, the electrical system: (B2) a. groups into one system for power backup (No-break-power-transfer) b. divides into three different channels (bus isolation) c. divides into two channels, one for critical autoland components, other for non-critical systems(load shedding)

Answer 28

(B)

Question 29

The APU generator is cooled by (B1) a. Fuel b. Oil c. Air

Answer 29

C

Question 30

When there are only two IDG operating, what happens if right IDG fails? (B1) a. BU converter will power AC right bus b. AC left bus will power AC right bus c. STBY system will power AC right bus

Answer 30

B

Question 31

What component control the load shedding? (B1) a. BPCU b. GCU c. ELMS

Answer 31

C

Question 32

When there too much oil in side the BUG, the indication on ELEC MAINTENANCE PAGE will be (B1) a. OVERFILL b. SERVICE c. UNDERFILL

Answer 32

B

Question 33

Backup Generator (BUG) Converter will automaticcaly check the BUG (B1) a. Right after engine shut down b. When DC STBY self test c. Right after the engine is started

Question 34

Permanent Magnetic Generators (PMGs) which supply power for Flight Control Computer Power Supply Assemblies (FCDC PSA) are located in (B1) a. IDG b. BUG c. RAT

Answer 34

B

Question 35

Which External Power Source will automatically power Ground Handling bus without selecting BAT switch to ON (B1) a. Primary b. Secondary c. Primary and Secondary

Answer 35

A