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CL-65 (900s) Study Guide 2019 > Electrical > Flashcards

Electrical Flashcards

1
Q

Location of Main Battery

A

Nose compartment

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2
Q

Location of the APU Battery

A

Aft equipment bay

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3
Q

Max Engine Generator load

A

40 KVA

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4
Q

Max APU Generator load

A

40 KVA

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5
Q

Max Transformer rectifier unit (TRU) load

A

120 amps

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6
Q

Max permissible time for ground operations with battery power only

A

5 minutes

Prevents ED1/ED2 from overheating, fans are AC powered

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7
Q

How many TRUs are installed in the CRJ 900

A

4

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8
Q

Where are the TRUs located

A

nose compartment

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9
Q

The Main Battery is rated to

A

17 ampere hour/24 volts

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10
Q

APU Battery is rated to

A

43 ampere hour/24 volts

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11
Q

How many generators are installed

A

4, 2 engine generators, 1 APU generator, 1 ADG

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12
Q

What is the function of the 4 TRUs

A

To convert 115 V AC to 28 V DC

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13
Q

How are the TRU’s cooled

A

Individual fans

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14
Q

Which buses are powered when the Battery Master switch is selected on

A

Main battery direct bus, APU battery direct bus, DC Battery bus

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15
Q

If the main buses are powered, are the essential buses automatically powered

A

Yes

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16
Q

Is there an on/off switch for the TRU’S

A

No, they are automatically powered when the AC busses are powered

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17
Q

What controls the DC tie contactors

A

The DC Power Centers (DCPC) automatically control DC tie operation

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18
Q

With the ADG deployed, what are the basic items that are powered

A

AC ESS Bus, Hydraulic pump 3B, flaps/slats, STAB trim CH 2

19
Q

What is the ADG max load

A

15 KVA

20
Q

ENG driven IDGs have an overload rating of

A

45KVA/5min

60KVA/5sec

21
Q

Main Generators provide AC power to how many AC buses

A

4

Bus 1/2, ESS Bus, Service Bus

22
Q

Power to the 28v DC Systems is supplied by

A

4 TRUs

Transformer Rectifier Units

23
Q

TRU 1 Supplies PWR to

A

DC Bus 1

24
Q

TRU 2 supplies PWR to

A

DC Bus 2

25
Q

ESS TRU 1/ESS TRU 2 normally supplies

A

DC ESS Bus

26
Q

The Main Battery is charged by

A

AC Bus 1

27
Q

The APU Battery is charged by

A

AC Service bus

28
Q

IDG provide a means of converting

A

variable engine speed to contact GEN speed of

12,000rpm

29
Q

Fault protection is provided by

A

Generator Control Units (GCUs)

30
Q

Priority for allowing power to AC Bus 1 is

A

Gen 1
APU
Gen 2
External AC

31
Q

IDG 2 (Gen2) normally powers

A

AC Bus 2

Service Bus

32
Q

Which DC Bus ties are automatic

A 
Main Tie
Cross Tie
ESS Tie
TRU Contactor Control
ESS TRU Transfer
33
Q

The ADG will auto deploy

A 
With complete loss of A/C power
AC Bus 1&2 falls below 50v
WOW indicates Aircraft is airbourne
Any GEN was online for 3.45 sec prior to power loss
on AC Bus 1/2
34
Q

Amber IDG Fault/Caution light indicates

A

Low IDG oil pressure / High oil Tempurture

35
Q

AUTO XFER fail light on Electrical panel indicates

A

GEN overcurrent or Bus Fault

36
Q

AC ESS XFER light (White) on ELEC panel indicates

A

AC Bus 1 is no longer powering AC ESS Bus

37
Q

What happens when you switch on the DC SERVICE switch

A
  • W/no AC PWR, SERV BUS is powered by APU BATT BUS via Service Bus contactor
  • SERVICE CONFIGURATION message appears on DC Synoptic page
  • Service Bus contactor not represented on DC Synoptic page
38
Q

What happens when the Battery Master is

Switched on

A

Connects Main Battery to BATT BUS through MAIN BATT Direct Bus
APU Battery to BATT BUS through APU BATT
Direct Bus

39
Q

How many DC busses are there

A

9

DC Bus 1,2
Service Bus
Utility Bus
ESS Bus
BATT Bus
APU Battery Direct Bus
MAIN Battery Direct Bus
DC EMER Bus
40
Q

What happens when TRU 1 fails

A 
Main Tie Contactor Closes
TRU 2 PWRs DC Bus 1
DC Utility Bus  loads sheds
Status Message Appears:
              -(TRU1 failed, Main Ties Closed)
41
Q

What happens when TRU 1 and 2 fail

A

DC Main and Cross Tie automatically closes
ESS TRU 2 PWRs:
-DC Bus 1/2, DC SEV Bus
DC Utility Bus is shed (OFF)
Status Message appears:
-Main&Cross Tie have closed
-TRU 1/2 failed

42
Q

What happens when ESS TRU 1 fails

A

DC ESS Tie closes allowing ESS TRU 2 to power
DC ESS Bus
DC ESS Tied Closed Status Message appears

43
Q

Which DC Bus Ties DON’T have automatic operations

A

Service Bus Contactor

It is activated by DC Service switch on the overhead panel when there is no AC power to airplane

CL-65 (900s) Study Guide 2019 (23 decks)

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