Electrical

Question 1

Main battery Amp? Voltage?

Answer 1

17 Amp & 24 V

Question 2

APU Generator Amp? Voltage?

Answer 2

43 Amp & 24V

Question 3

What are the 4 AC BUSs

Answer 3

AC BUS 1
AC BUS 2
AC ESSENTIAL BUS
AC SERVICE BUS

Question 4

What does the AC AVAIL/IN USE switch-light do?

Answer 4

AVAIL (green) indicates external power is connected and ready to use
IN USE (white) indicates that the external AC power is supplying the electrical system

Question 5

What is the purpose of the IDG 1 & 2, gaurded, switch-lights?

Answer 5

used to disconnect IDG (integrated engine driven generator) from engine (white light means successful disconnect.
FAULT light (amber) indicates a fault within the system. (High oil temp/ low oil pressure)

Question 6

What does the AC ESS XFER (white) switch-light mean?

Answer 6

Indicates that essential bus is being powered by AC BUS 2. This automatically happens during a Bus 1 failure

Question 7

What position should (in normal operations) the GEN 1 & 2 switches be in?

Answer 7

AUTO- this connects the generator to the associated bus.

OFF/RESET disconnects or resets the generator from the GCU (generator control unit)

Question 8

What does the FAIL (amber) light mean on the AUTO XFER switch-light mean?

Answer 8

indicates a fault preventing autotransfer

Question 9

What is the bus priority for AC BUS 1? AC BUS2?

Answer 9

1. GEN 1
2. APU GEN
3. GEN 2
4. External Power
   (goes the other direction for BUS 2)

Question 10

How long are the batteries good for in emergency operation?

Answer 10

30 minutes

Question 11

What is the minimum volts the APU battery & Main battery should show?

Answer 11

22V

Question 12

What does the Battery Master Switch do?

Answer 12

Connects the APU battery and Main Battery to the Battery Bus

Question 13

What does the DC SERVICE switch do?

Answer 13

Connects the DC service bus to the APU battery direct bus (powers Nav’s, Lav’s, & Dome’s)

Question 14

What causes a generator or the APU to be tripped off & removed from the BUS?

Answer 14

Over/under voltage or Frequency
Overcurrent
Out of phase

Question 15

On the ground with only battery power available, why is operating time limited?

Answer 15

5 min. due to the fans used to cool EICAS displays are AC powered and not operating yet.

Question 16

How many TRU’s are on the CRJ 700/900?

Answer 16

4 TRUs (Transformer Rectifier Unit)

Question 17

What is each TRU rated at?

Answer 17

supplies 115 VAC power to create 28 VDC unregulated power. max rated at 120 amps.

Question 18

A Fault resulting in the loss of AC BUS 1 will result in loosing how many TRU’s?

Answer 18

1

Question 19

What amount of power do the IDG’s produce?

Answer 19

115 VAC
400Hz
3 phase electrical power
rated at 40 kVA

Question 20

When does the ADG automatically deploy?

Answer 20

AC BUS 1 & 2 are unpowered
No weight-on-wheels signal
aircraft generator was the last power source

Question 21

what does the ADG provide?

Answer 21

115 VAC
400 Hz 3 phase
rated at 15 kVA

Question 22

At what airspeed does the ADG not supply power any more?

Answer 22

below 135 KIAS