Power plant

Question 0

The variable geometry (VA) system varies the position of the inlet guide vanes and the stator vanes on stages

Answer 0

1 to 4

Question 1

The CF34-8C5, with APR has a thrust rating of

Answer 1

13,560-14,750 lbs

Question 2

What engine model is on the CRJ 900 series aircraft

Answer 2

CF34-8C5

Question 3

During normal operations the DCU monitors

Answer 3

N1, N2, ITT, oil pressure, oil temp, engine vibration and fuel flow

Question 4

6th & 10th stage bleed air is used for

Answer 4

Air Conditioning

Question 5

The engine may be started by the APU, ground source, or engine crossbleed T/F

Answer 5

True

Question 6

Crossbleed air starts require?

Answer 6

Operating engine to achieve 42 psi

Question 7

IGN B (igniter) is powered by

Answer 7

Battery bus

Question 8

Ignition cut-out occurs at

Answer 8

50% N2

Question 9

Refilling of the oil system is provided by the replenishment tank located in the:

Answer 9

Aft equipment bay

Question 10

Engine oil is cooled by

Answer 10

Fuel/oil heat exchanger

Question 11

80% of engine thrust is generated by

Answer 11

Bypass air

Question 12

How are CRJ engines protected against compressor stalls and surge protection

Answer 12

Variable geometry vanes

Question 13

Under what condition can FADEC be set to FLEX thrust (verified 7/22/2013)

Answer 13

Thrust levers idle or shut off detents
WOW for at least one minute
Assumed temperature is greater than OAT
airspeed is less than 65 KIAS

(Must be entered into the FMS)

Question 14

When will OEO thrust be activated

Answer 14

N1 mismatched 15% RPM

Question 15

The left engine is the master engine for

Answer 15

N1 & N2 sync

Question 16

The primary thrust setting reference is

Answer 16

N1

Question 17

With wing Anti-Ice on, the N2 RPM indicators will

Answer 17

Turn white from 0-77%

Question 18

The left engine START switch light, when pressed in

Answer 18

Opens the left bleed air start valve and the isolation valve

Question 19

After engine shutdown, engine oil level should be checked within:

Answer 19

3 minutes to hours.

Question 20

What is the make and model of the engines in the CRJ 900?

Answer 20

General Electric CF34-8C5

Question 21

The engine’s accessory gearbox is driven by what?

Answer 21

The N2 compressor

Question 22

When is OIL LEVEL LO status message displayed?

Answer 22

When oil quantity is less than 20%.

Question 23

When must continuous ignition be used?

Answer 23

Takeoffs and landings on contaminated runways
Flight through moderate or heavier intensity rain
Flight through moderate or heavier intensity turbulence
Flight in the vicinity of thunderstorms

Question 24

What is the bleed air source for the CRJ 900 air conditioning system?

Answer 24

6th or 10th stage Axial compressor.

Question 25

How is the air conditioning pack pressure controlled on the CRJ 900 when the engines are supplying bleed air?

Answer 25

Pack valves

Question 26

Bleed air is taken from what stages of the engine compressor?

Answer 26

6th or 10th stages.

Question 27

Engine N1 speed governing is a function of:

Answer 27

FADEC

Question 28

CF34-8C5 takeoff and APR thrust values are ——- & ——- foot pounds.

Answer 28

13,560 & 14,750

Question 29

N1 and N2 synchronization is available during:

Answer 29

Cruise flight

Question 30

N1 consists of what?

Answer 30

1 fan rotor in the very front that is connected to a four stage low pressure turbine in the back of the engine. This four stage turbine is accelerated by the exhaust high pressure air from the N2 section. The four stage low px turbine in the very back drives the fan rotor in the front( cause it’s connected)

Question 31

N2 consists of what ?

Answer 31

A ten stage axial (center) flow compressor, a combustor, accessory gearbox and a two stage high px turbine aft of the 10 stage compressor. The two stage compressor is driven by the exhaust air from the 10 stage which turns the 10 stage compressor faster.

Question 32

What is the accessory gearbox attached to ?

Answer 32

N2 compressor

Question 33

What is on the accessory gearbox ?

Answer 33

Fuel pump and (FMU) fuel metering unit
IDG
Starter (Air turbine starter)
Hydraulic pump
OIL lubrication pumps
\+ FADEC alternator
\+ Integral oil reservoir

Question 34

What does the FADEC alternator do ?

Answer 34

Completely separate power source for FADEC. ABOVE 50% N2, it powers both FADEC channels.

Question 35

What is the Air Turbine Starter ?

Answer 35

Starts the engine by turning pneumatic energy into mechanical motion.

Question 36

What is the minimum PSI on the operating engine for a cross bleed start ?

Answer 36

42 PSI