1) The function of the exhaust cone assembly of a turbine engine is to Report

swirl and collect the exhaust gases into a single exhaust jet

collect the exhaust gases and act as a noise suppressor

straighten and collect the exhaust gases into a solid exhaust jet

2) A nozzle is 'choked' when the gas flow or airflow at the throat is Report

sonic

subsonic

supersonic

3) The struts on the exhaust cone Report

straighten the gas flow only

support the exhaust cone and straighten the gas flow

support the exhaust cone only

4) A nozzle is 'choked' when the engine inlet airflow is Report

subsonic

supersonic

subsonic or supersonic

5) What is the maximum practical angle through which the gas flow can be turned during thrust reversal? Report

50^o

135^o

180^o

6) A supersonic duct is Report

convergent then divergent along its length

divergent then convergent along its length

a convergent duct that is choked at the largest end at mach 1

7) Noise from the jet wake when untreated by suppression is Report

high frequency, high decibel

low frequency, low decibel

low frequency, high decibel

8) Hot spots on the tail cone of a turbine engine are possible indicators of a malfunctioning fuel nozzle or Report

a faulty igniter plug

a faulty combustion chamber

an improperly positioned tail cone

9) An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to Report

increase and the velocity to decrease

decrease and the velocity to increase

increase and the velocity to increase

10) A convergent-divergent nozzle Report

requires the aircraft to be travelling at supersonic speeds

makes maximum use of pressure thrust

produces a type of thrust known as kinetic thrust

11) The velocity of supersonic air as it flows through a divergent nozzle Report

decreases

increases

is inversely proportional to the temperature

12) The Jet Pipe of a gas turbine engine Report

protects the airframe from heat damage

has an inner cone to protect the rear turbine disc

is convergent in shape to increase the velocity as much as possible

13) For what purpose is the propelling nozzle of a gas turbine engine designed? Report

To increase the velocity and decrease the pressure of the gas stream leaving the nozzle

To decrease the velocity and increase the pressure of the gas stream leaving the nozzle

To increase the velocity and pressure of the gas stream leaving the nozzle

14) If the exit area of the nozzle was too large, the effect is Report

exit velocity lower causing loss of thrust

will choke at a lower gas temperature

exit velocity lower, negligible effect on thrust

15) A choked nozzle Report

increases thrust

decreases thrust

has no effect on the thrust

16) The exhaust section is designed to Report

increase temperature, therefore increasing velocity

decrease temperature, therefore decreasing pressure

impart a high exit velocity to the exhaust gases

17) Reverse thrust can only be selected when the throttle is Report

closed

open

75% power position

18) A Convergent-Divergent nozzle Report

Makes maximum use of Pressure thrust

Produces a type of thrust known as kinetic thrust

Requires the aircraft to be travelling at supersonic speeds

19) On front fan engines, to obtain thrust reversal, the Report

hot stream is reversed

cold stream is reversed

hot and cold streams are reversed

20) Exhaust noise can be reduced by Report

lowering the vibration frequency

increasing the mixing rate

increasing the jet velocity

EASA Questions Mod 15: Gas Turbine Engine Set 7: Engine Exhaust

Set 1: Fundamentals

Set 2: Engine Performance

Set 3: Engine Inlet

Set 4: Eng. compressors

Set 5: Combustion Section

Set 6: Turbine Section

Set 7: Engine Exhaust

Set 8: Bearing and Seals

Set 9: Lubricants and Fuel

Set 10: Lubrication system

Set 11: Fuel Systems

Set 12: Air Systems

Set 13: Ignition Systems

Set 14: Engine Indication

Set 15: Power Augmentation

Set 16:Turboprop engines

Set 17: Turboshaft

Set 18: APU

Set 19:Powerplant Installation

Set 20: Fire Protection

Set 21:Engine Monitoring

Set 22: Engine Storage