DC & AC Systems

Question 1

The battery is limited to operating the entire DC System for how long?

Answer 1

15 Minutes

Question 2

The battery is limited to operating the emergency bus only, for how long?

Answer 2

30 Min

Question 3

The NiCad Battery is limited to how many battery starts per what period of time?

Answer 3

3 per hour

Question 4

The power cart should be able to produce how many volts and Amps.

Answer 4

28Voktz and 1000 amps

Question 5

Which type of engine start requires a simultaneous closing of both start relays ?

Answer 5

Cross Gen Start

Question 6

When does the battery Diconnect relay open?

Answer 6

Cart Starts or EPU or GPU

Question 7

By which switch is the battery relay operated ?

Answer 7

Battery Switch

Question 8

By which switch is the Emergeny Oower relay operated?

Answer 8

Battery Switch

Question 9

From where is the emergency exit hatch and cabin door lights powered?

Answer 9

Battery Pack (20 ganged together batteries)

Question 10

From where is the Emergency Exit and cabin door lights battery pack powered?

Answer 10

Hot Battery Bus

Question 11

From where are the front baggage and tail cone baggage lights powered?

Answer 11

Hot Battery Bus

Question 12

Which of the system valves, when DC power is lost, fails in place?

Answer 12

Fuel Crossfeed

Question 13

Which of the system valves when DC Power is lost fails closed?

Answer 13

BOVs and Emergency Pressure, and why?

Their default fail-safe position is closed to prevent uncontrolled or excessive bleed air flow, which could lead to system overpressure, potential structural damage, or unsafe operating conditions.

Question 14

What is the indication from the battery over temp light between 145-160F

Answer 14

Steady Light

Question 15

A flashing battery over temp light indicates a battery temperature of what?

Answer 15

160 deg F plus

Question 16

From where are the battery and emergency power relays powered?

Answer 16

Hot Battery Bus

Question 17

Starters, during a battery start, are limited to how many starts with what?

Answer 17

3 Starts in 30 mins

Question 18

What are the starter limitations during a Cross Gen or a Powercart Start?

Answer 18

2 in 30 Minutes

Question 19

A cross generator start counts as what, towards allowed battery starts?

Answer 19

1/3 of a start

Question 20

In which position are the generator switch’s for a power cart start?

Answer 20

Off

Question 21

The standby AC inverter requires that “Batt” switch to be in which position?

Answer 21

Emergency Position

Question 22

How many buses do each of the two AC inverters power?

Answer 22

2 Buses

Question 23

When does the Battery Disconnect relay close?

Answer 23

At Start completion

Question 24

The Emergency Exit signs are powered by which bus?

Answer 24

None

Question 25

If in the oral exam you don’t know the answer to an electrical question, answer?

Answer 25

How or GCUs.

Question 26

How many buses are in the AC system?

Answer 26

4 Busses

Question 27

How many (normal operating) AC Inverters power the AC busses?

Answer 27

2 Inverters

Question 28

What two items does the standby inverter power?

Answer 28

Standby HSI display and NAV 1

Question 29

Placing the Gen switch in Gen (generator operating) closes which relay?

Answer 29

Power relay

Question 30

The Generator Switch is moved to the Reset position for what purpose?

Answer 30

Field Reset

Question 31

To what, is the generator limited to at engine operations at Idle Norm?

Answer 31

125 Amps

Question 32

To what is the generator limited to during engine operations at idle high?

Answer 32

225 Amps

Question 33

In flight the generator is limited to how many amps?

Answer 33

300 amps

Question 34

What is the maximum inflight amperage overload and for how long ?

Answer 34

450 amps for 5 Minutes

Question 35

The white “start button” light or lights indicates which relay or relay’s are closed

Answer 35

Start relay or relays