10 Feb 2014

Jet Engine (Fed 2003 Session)




1. If jet velocity is 1288ft sec & airflow is 125lb what will be thrust produced?
(a)    4000 lb
(b)   6000 lb
(c)    5000 lb
(d)   3500 lb

2. If atmospheric temperature change but EGT remains unchanged during ground run but every define high power cruise flight then snag/fault is in
(a)    CIT
(b)   CDP
(c)    FCU
(d)   FCU altitude adjuster

3. In a turbo fan engine airflow is 60 lb in both fan and core engine exhaust and velocities are sec & -------- ft / sec what will be thrust produced?
(a)    1433 lb
(b)   --------lb
(c)    5433 lb
(d)   --------lb

4. CIT indicator in turbojet engine is
(a)    Copper constraint
(b)   Nickel platinum
(c)    Chromel alumel
(d)   All of the above

5. FACDEC means
(a)    Full authorized digital electronic control
(b)   Full authorized digital electronic control

6. Synchronous motor type fuel quantity gage measures
(a)    Fuel volume flow
(b)   Fuel mass flow
(c)    Its same of vane type indicator
(d)   As 02 & 03

7. In water injection system EGT is increased water injected at
(a)    Inlet
(b)   Diffuser
(c)    Nozzle
(d)   Simultaneous inlet & diffuser



8. If water injection is ON then
(a)    N1 spool shifts towards stall margin
(b)   N1 spool shifts away stall margin
(c)    N2 spool shift away stall margin
(d)   N1 & N2 shift away stall margin

9. High power to weight ratio is
(a)    Starter motor
(b)   Starter generator
(c)    Air turbine starter
(d)   Rachet & pawl

10. During installation of thermocouple length of sensor is increased then
(a)    Under read
(b)   Over read
(c)    Equal read
(d)   None of the above

11. During feathering of the propeller
(a)    Pitch angle fine
(b)   Pitch angle course more
(c)    Pitch angle negative
(d)   As 1 & 2

12. Aluminum propeller is cleaned by
(a)    Acid
(b)   A caustic solution
(c)    None of the above

13. Due to fatigue stress in turbine blade
(a)    Change of shape
(b)   Cracks in the trailing & leading edge perpendicular to length
(c)    Length will grow
(d)   All of the above

14. Due to fatigue stressing turbine blade
(a)    Change of shape
(b)   Cracks in the trailing & leading edge perpendicular to length
(c)    Length will grow
(d)   All of the above

Answers: 1 – c, 2 – a, 3 -  , 4 – b,c, 5 – b,c, 6 – b, 7 – a, 8 -  , 9 – c, 10 – a, 11 – a,
12 – c, 13 – d.



15. In which engine air speed kinetic energy at inlet is not changed in the static energy
(a)    Turbofan
(b)   Turbojet
(c)    Turbo shaft
(d)   Turbo prop

16. Synchronous system in propeller is used in
(a)    Single engine to equal the blade angle
(b)   Multiengine to allow same speed of engines
(c)    As 1 & reduce vibration
(d)   All the above

17. During flight which fault is not monitored by performance monitoring
(a)    EPR, EGT, PRM
(b)   EPR, EGT max, CIT
(c)    CIT, CDP, EGT max
(d)   CIT, CDP. EGT, RPM

18. If oil is found in exhaust
(a)    Replace engine
(b)   Seal leakage at bearing shaft
(c)    Carbon seal leakage in turbine shaft
(d)   Scavenge pump failure

19. Mark the correct statement
(a)    Pressure pump capacity is greater than scavenge pump capacity
(b)   Scavenge pump capacity is greater than pressure pump
(c)    Both pump capacity are same
(d)   --------------------------------------

 20. Gas velocity is high at
(a)    Inlet
(b)   Compressor
(c)    Turbine
(d)   Diffuser

21. Mark correct statement
(a)    Supervisory EEC develops command top actuate FCU
(b)   Supervisory EEC directly controls FCU
(c)    Supervisory EEC and sigma Hydro-mechanical fuel control unit
(d)   All of above





22. Mark correct statement
(a)    ACC controls tips clearance by cooling turbine case
(b)   --------------------------------------------------------------
(c)    --------------------------------------------------------------
(d)   --------------------------------------------------------------

23. Mark the correct statement
(a)    Turbo jet engine has lowest TSFC
(b)   Turbo fun has better hot day performance
(c)    Turbo fan has lowest TSFC up to 400 mile / hour
(d)   All of the above

24. Mark correct statement
(a)    Actual power output of engine as compared to the horsepower in fuel is thermal efficiency
(b)   Propulsive efficiency is the thermal efficiency

  
25.What is the effect of combustion emissions?
(a)    Populates surrounded area
(b)     
(c)     
(d)    

26. EPNAB means effective perceived noise decibel
(a)    Sound is dissipated at distance
(b)   __________________
(c)    It is standard measure of the loudness (Sound or) combined with frequency and duration of sound and is used specify for a/c noise in hemisphere
(d)   Soap  - spectrographic oil analysis port – spectrum tric oil analysis program

27. Mark the correct statement
(a)    In the flight CDP failure cause to run engine in idle
(b)   During starting CDP failure cause huy start
(c)    During ground CDP failure will cause to run engine idle
(d)   Any time CDP failure to run engine higher rpm

28. Polished shaft is used for which bearing
(a)    Carbon bearing
(b)   Labyrinth bearing
(c)    Nylon bearing
(d)   All of the above


29. Trimmer coil add in ignition system is
(a)    Convert AD to DC
(b)   Convert DC to AC
(c)     
(d)    

30. Difference between hi voltage of 10-voltage ignition
(a)    Hi voltages have high energy than 10 voltages
(b)   Hi
(c)     
(d)    

31. During oil analysis mg is gived Hi then a practice gear of problem in gearbox


Answer: 
 1 – c, 2 – a, 3 -  , 4 – b,c, 5 – b,c, 6 – b, 7 – a, 8 -  , 9 – c, 10 – a, 11 – a,
12 – c, 13 – d.
14 – d, 15 – c, 16 – b, 17 – c, 18 – b, 19 – b, 20 – c, 21 – c, 22 – a, 23 – c,
 24 – a.
25 -  , 26 -  , 27 – b, 28 – a, 29 – b, 30 – a, 31 -