Electrical Systems

Question 1

batteries volts and amps

Answer 1

2, 24 volt and 28 amps

Question 2

how long do the batteries guarantee power for (if operated correctly)

Answer 2

30 minutes

Question 3

generator volt and amps

Answer 3

28V, 300 amps

Question 4

battery amp charge rate must be less than ____ prior to takeoff

Answer 4

20 amps

Question 5

AC power voltage

Answer 5

115 volts, 400 Hz power

Question 6

transient load of 400 amps is allowed for

Answer 6

2 minutes max

Question 7

can tripped circuit breakers be reset

Answer 7

no unless deemed necessary, only 1 attempt is allowed

Question 8

Bus with a P

Answer 8

DC

Question 9

Bus with an X

Answer 9

AC

Question 10

Bus with S

Answer 10

split

Question 11

6 positions on the rotary switch

Answer 11

B1, B2, PS1, PS2, PE, XFER

Question 12

____ V or greater will cause GCU to open GLC due to over voltage

Answer 12

32.5

Question 13

How many generators?

Answer 13

3
each engine, APU

Question 14

bus tie contractor will automatically open if the system drops below

Answer 14

24.5 V

Question 15

must be under _____ amps for takeoff

Answer 15

20

Question 16

Where does the Gpu plug in

Answer 16

right, aft fuselage (close to under the tail, by the apu exhaust)

Question 17

what do inverters do

Answer 17

convert DC to AC power

Question 18

only power source that will every DC bus

Answer 18

gpu

Question 19

Red circuit breaker

Answer 19

fire supression

Question 20

white circuit breaker

Answer 20

unswitched PE

Question 21

yellow circuit breaker

Answer 21

electric pitch trim

Question 22

gpu stabilize bus bars at

Answer 22

28.5V

Question 23

what N2 turns starter to generator

Answer 23

42%

Question 24

Max continuous generator load

Answer 24

300 amps
over is 400 amps

Question 25

starter limits

Answer 25

30 sec on, 1 min off
30 sec on, 1 min off
30 sec on, 30 minutes off

Question 26

Volt regulator will open GLC if

Answer 26

reverse current
overexcitation
overvoltage 32.5 volts

Question 27

bus-tie contractor will open if

Answer 27

29.5 +/- .5 V
24.5 +/- .5 V

Question 28

When a generator is offline and the GEN Fail and ELECT annunciators are illuminated, the generator can be reinstated by:

Answer 28

Positioning the GEN switch to CLOSE for five seconds, then releasing it.

Question 29

The battery charging rate can be monitored by

Answer 29

depressing the BATT ammeter pushbuttom

Question 30

GPU must produce: for engine starting

Answer 30

28 volts, 1500 amps, 1100 amp current limiter

Question 31

APU is connected to which bus

Answer 31

PS2 Bus

Question 32

What can power the PS1 bus

Answer 32

generator or ground power

Question 33

how many volts does the APU have and what does it run

Answer 33

28, PS2

Question 34

what gives power to PS1

Answer 34

PS2 but only when bus tie connector is tied which is done manually

Question 35

PS1 and PS2 run what

Answer 35

charge battery 1 and 2 (24 volts each)
PE bus (28 volts)

Question 36

what bus runs even in full electrical failure

Answer 36

PE

Question 37

what turns the generator from starter to generator

Answer 37

GPU

Question 38

what does the GCU do

Answer 38

voltage regulator
protects from reverse flow
stabilizes bus bars at 28.5
protects over voltage at 32.5 volts

Question 39

what circuit breakers get pulled to reserve power

Answer 39

all the white ones

Question 40

how do you charge batteries with GPU

Answer 40

ext battery CGH ON switch

Question 41

if checking the power of a bus and it is left on, what will happen

Answer 41

battery will be dead