Heavy Aircraft Question Bank

H.A.

QUESTIONS:

1. If excessive fogging is found in a/c cabin, what are its probable cause & remedial action to be taken?

2. Draw the schematic diagram of emergency L/G retraction system by using standly hydraulic power?

3. Draw the schematic diagram of nitrogen charging trolley & name the parts. what is the purpose of pressure reducing valve of regulator valve?

4. Write a note on cutting & drilling plastic material?5. What type of a/c are low thickness aerofoil? Explain with reasons?6. What are the special precautions on AME should takes before releasing the a/c in rainy season?7. How is the L/G warning system tested on ground?8. What are the inspection to be carried out on hose assemblies? What are the precautions to be taken

during installation?9. What are the different materials used one core materials in composites? Write a few defects in

composites which can be classified as minor & a/c released for flight with special precautions?10. How is the level of fluid in a sock stout checked?11. What is wing body heating system? Explain its operation?12. Write the procedure of fuel transfer from LH wing tank to RH wing tank?13. Write the construction of wind screen. What is the purpose of heating it?14. Write a note on Mach trim & speed trim?15. Draw the diagram of shinning damper & explain its working?16. What is the purpose of negative pressure relief valve & safety pressure valve?

OBJECTIVE QUESTIONS:

1. Static margin is the distance betweena) aerodynamic center & neutral pointb) aerodynamic center & center of gravityc) center of pressure & center of gravityd) neutral point and center of gravity

2. During nidder maintenancea) chord line should be parallel to horizontal b) hose over condition is called over balancec) hose down condition is called over balanced) as in a & c

3. Loft does not depend ona) aerofoil designb) amount of using dehedralc) density of air & velocityd) wing surface area

4. Which of the following should also be checked in addition to hard landing inspection items, when the a/c makes hard landing

a) wing center sectionb) arcing of propellerc) balancing of control surfacesd) none

5. Artificial feel is used ina) aileron control systemb) elevator control system c) rudder systemd) all

6. Which of the following takes the structural loads in the wheel bay?

a) keel beamb) transverse beamc) box beamd) all

7. Structural fusea) prevents primary structure damageb) previcts shear loadsc) prevents overflow of current in the circuitd) as in a & c

8. Color coding of ‘O’ rings indicatesa) ageb) tempc) vapour compatibilityd) all

9. The angle of attack where lift/drag ratio is maximum is calleda) ditedralb) anhedralc) incidenced) washin

10. Mark the correct statement a) stall speed with c.g forward movementb) stall speed with backward movementc) stall speed does not change with c.g movement

11.Station 185 indicatesa) 183 mm back of the nose or reference datumb) 183 inch back of the reference datumc) 183 cm back of the nose or reference datumd) 18.30 inch back of the nose or reference datum

12. ‘Out of freezer’ life is associated witha) epoxy resinb) catalystc) prepegd) thermosetting

13. Amount of roll dies not depend ona) Angle of pitchb) Angle of bankc) Angle of turnd) As in a & c

14. Damage of rivets around the head is usually a) greyb) whitec) brownd) as in a & c

15. The a/c is about to land, the fowler flap is extended, it will cause:a) in liftb) in dragc) lift with nose drag movementd) normal

16. When the temperature is more than standard value, the TAS will be

a) higherb) lowerc) first & then remains with effectedd) remains inaffected

17. Strain is measured bya) original length divided by change in lengthb) force by areac) pressure multiplied with change in lengthd) unit distortion of body

18. How selection providesa) 250v ACb) 218 v AC & 121v respectivelyc) 218v, 400 Hz AC d) none

19. Adverse load distribution requiresa) gross weight inspectionb) aft adverse loading checkc) forward adverse loading checkd) all the above

20. Which pressurization system component prevents cabin altitude being more than the a/c altitude a) safety relief valveb) negative pressure relief valvec) compressor inlet sentor

21. A solid metallic sound in coin tap test of honeycomb structure indicates:a) core damage b) facing damagec) facing & core damaged) separation of layers in honeycomb constructions

22. Smoke clearance system is used witha) pneumatic systemsb) fire protection systemc) as in b and a pre-set temperature

23. Emergency exit devices located/associated witha) cabin entry doorsb) passenger entry doorsc) cargo entrance

24. To avoid tip stalling & making the aileron effective for complete flight, wing is provided with was out, wash out means

a) incidence is angle is greater at wing tip than wing rootb) incidence angle is greater at wing root than wing tipc) wing tip is a located ahead when componed to wing root

25. Under inflation is indicated bya) shoulder wear out in the tyreb) more tread wearc) high brake heat

26. Tail skid preventsa) tail section damageb) rotation of a/cc) as in a & c

27. Static discharge damage is identified by

a) pits on the surfaceb) wing tips & trailing edges are damagedc) round holes on the surfaced) usually found at wing tips, trailing edges & antennas

28. When proper jigs are not available, the smoothness of center of the a/c wing is measured bya) applying Vaseline & cellulose paperb) using a thin cord along the leading edge to trailing edge parallel to the line of flightc) veins a thin cord long the lending edge to trailing edge parallel to the lateral axisd) both a & b

29. Boundary layer thickness is minimum wherea) airflow gets zero to max velocity changeb) airflow velocity is maximumc) –d) –

30. At high altitudes, presence of foam in hydraulic fluid is caused by a) defective pressurization systemb) no hydraulic fluid in the system c) low pr in the system

31. Purpose of surge tank isa) it protects tank structure damageb) it allows fuel to flow into the tank which is at a laterally lower level c) it collects over flowing fueld) as in b & c

32. With in airspeeda) induced drag more than parasite dragb) parasite drag more than induced dragc) induced & parasite drag will be samed) induced & parasite drag will not be affected

33. Surface hardness of steela) with of carbon contentb) only upto a certain point with of carbon contentc) max for wrought irond) depends on the process involved

34. Parts which are cold worked should not be a) weldedb) kept in room with high our tempc) kept in air conditioned roomd) –

35. Corrosion on spot welding seam is detected bya) X-rayb) Ultrasonicc) Straight edged) Point peeling off

36. Mark the correct statementa) spoilers are used with ailerons for lateral stability about longitudinal axisb) flaps & spoilers are auxiliary control surfaces used for lateral stabilityc) –d) all the above

37. Contamination of hydraulic fluid is found bya) viscosityb) flash point

c) moisture contentd) all the above

38. Mark the correct statementa) damage of nose cone does not affect flt of an a/cb) damage to secondary structure like wing tip & nose cone does not affect the flt of a/cc) damage to seat & seat supporting structure affect flightd) none of the above

39. Mark the correct statement regarding reynold’s numbera) if the Rey’s no is high then kinematic velocity is highb) higher the Rey’s No., higher the kinematic viscosityc) higher the Rey’s No, smaller the kinematic viscosityd) higher the Rey’s No. smaller the kinematic viscosity & velocity

40. Vortex generators are aerofoils installed on wing upper surface becausea) laminar flow is more difficult to separate than turbulent flowb) turbulent flow is more difficult to separate than laminar flowc) –d) –

41. Balance panels are operateda) hydraulically b) manuallyc) only in turbulent weatherd) to balance the ailesins

42. Mark the correct statementa) steel & magnesium is used for secondary structural membersb) fiberglass & magnesium is used for secondary structural membersc) Al honey comb & fiberglass honey comb structure is used for secondary structural memberd) Al is used for a particular type of lead only

43. Mark the correct statementa) if one rivet is tripped, then the adjacent rivets are also tripped in the same directionb) bearing failure occurs at rivet shankc) shearing failure occurs at rivet hole

44. Turn & slip indicator measurea) the amount of tumb) the rate of tumc) in slip the amount of tum is too lowd) in skid the amount of tum is too high

45. The acceptable deviation in magnetic compass due to local effects the aircraft is a) 1b) 2c) 3d) 5

46. Mark the correct statementa) phosphating on steels prevents corrosionb) chromatizing is done on aluminium as a protective treatment against corrosionc) cadmium plating on aluminium penetrates into the base metal there by giving corrosion resistanced) all the above

47. In the operation of VSIa) diaphragm expands in climbingb) diaphragm shrinks in climbingc) diaphragm expands & shrinks in level fltd) both b & c

1. Fail safe concept – if one members fails other takes the concept

2. Flexible hose installation is secured in 12” inches

3. Permissible elongation to chains in% - 2%

4. Spongy operation of the brakes may be caused by air in the system

5. Grabing of brakesa) wearing the brake linersb) mster cylinder return spregec) brake rod return mechanism may be week

6. Changing direction of controla) pulleys b) fail lead

7. MIL-D-7850 fungeside for collulose accratic hydralic the fungiside designated in this specification isa) copper sulphateb) zinc dimethyl dith carbonate

8. FLT is placed ina) as far as aftb) frontc) as per manufacturers

9. Flap co-efficient of lift 1234a) slotted, fowler, plates, spletb) fowler, slotted, splet, plates

10. Rudder horn materiala) magnesiumb) Al alloy cartc) Al alloy

11. Trikloven cleaning is used ona) titaniumb) titanium alloyc) Ald) Al alloy

12. OR compass returns to normal positiona) dead beatb) liquid swinelling

13. Nicad battery spillage is cleaned bya) dilute acetic acid

14. Which marker is used on exhaust drillsa) lead pencil (uncarbondied pencil)b) blue

15. A/c oxygen system should not be service whena) leakageb) contaminated fitting

16. Squeezing brakes – because of brake pads worn out & rivets touching the metal

17. Draging of brakesa) wearing of brake liningsb) master cylinder returns spring weak

c) brake return spring is weakd) bubble in the flux

18. Material of 4350 -

19. Material used for the a/c skina) 2024b) 6056c) 9014d) 5056

20. Densily & alectudea) high altitude high density a/c moves fastb) high altitude low density a/c moves fast

21. British manufactured a/c, when L/G retracted & locks what light comes ona) amberb) no lightc) greend) blue

22. In connect acrylic a/c wind shield. After tightening & the screw is loosened bya) one turnb) half turnc) one & half turnd) two turn

23. After heavy landing, which of the following are motiona) wrinkles on upper surface of the wingb) bent L/G stint

24. A suction gage must be installed in cockpit if the a/c fitted with what type of gagea) manifold pressure gageb) artificial horizonc) altimeterd) VSI

25. Which type of snow is mostly useda) 2024b) 2014c) 2117

26. Turn & slip indicator works on which axisa) Yaw axisb) Lateral axisc) Longitudinal axis

27. Tab on leading edge is toa) to stall lines position first than outer portionb) to reduce stalling speedc) to reduce angle of lock

28. Rigging is done for the purpose ofa) to respond the control surface properly with lock pit controls

29. Quadrants are used toa) change the direction

30. Load factora) ratio of the wing load to a/c operating weightb) ratio of the wing load to a/c empty weight

31. which is most easily & widely useda) control cableb) push pull rodsc) control rods

32. If cable is to deflect 3a) fan leads are usedb) pressure seals

33. What control system is used in the operation of pull a) Drum

34. Direct conal stabilitya) dorsal fin is usedb) wingsc) dihedral

35. In V.S.Ia) capsule has an accurately measured holeb) capsule is encapsulated in or causec) pressure lagsd) b & c are correct

36. Drag created other than on lifting surfacesa) induced dragb) profile dragc) parasite & induced

37. As the C.G moves forwarda) max load on nose landing gear

38. On wing skin is sinoted toa) sparsb) -c) ribsd) all the above

39. Tapered wing

40. Fall safea) complex structure one member falls other member takes the load

41. Welding neutral flame is used ona) steelb) Alc) Magnesium

42. Para static tube installationa) where turbulent air lessb) wing edgesc) front of the a/cd) a & c are correct

43. Acrylic wind shield cracka) radial crack

44. In which actuator spring chamber is useda) single actingb) double actingc) 3 way actuated) b & c are correct

45. Paint on a swaged joint is to disclosea) loosening of cable

46. – failure of wooden structure

47. The members used across longeronsa) stringersb) bulk heads

48. Fretting corrosion on bolted joints on Ala) blackb) whitec) brownd) green

49. Galvanic corrosion ona) piano hinges

50. Dope thicknessa) thickness of the lopeb) No of coats of lope

51. Pitot testing the pressure is applied and leak should not be more than

52. What is the free air temp in respect to a/c instrumenta) air temp over the wingb) air flowing around the fluidc) air which is compressed just before the a/cd) air just before reaches the a/c

JET ENGINE

1. Duplex ball bearings takesa) axial and radial axis efficientlyb) axial load onlyc) fail safe loadingd) –

2. The fig shows a modern turbofan engine, the purpose at the vertex device isa) to dissipate the heat from the fan cowlb) to streamline the airflow over the wing surfacec) to reduce the turbulance of airflow over the wind during low speeds of flightd) to reduce the turbulance of airflow over the wind during high speeds of flight

3. A modern turbotantengine fitted a/c flying from Delhi to Madras. The temperature at Delhi is 15C, while in Madrasis 28C. to achieve the same power at Madras.

a) throttle should be adjusted fwd when approaching at Madrasb) throttle should be retarded when approaching madrasc) no adjustment is necessary throughout the flightd) throttle can be adjusted either fwd or retarded to keep the Ni rpm constant

4. Match the following:a) X-40 steelb) Rene 84 Coc) 6-2-42 Nid) A286 Ti

5. Fig.a) pressure is high in tube Ab) pressure is high in tube Bc) pressure is same throughd) there will be rise in pressure in tube B due to turbulance

6. In flight CSD oil temp light comes ‘ON’ and the pilot disconnected the CSD. Then it can be connected back

a) only on groundb) only in flightc) either on ground or in flightd) automatically connected after oil temp is reduced

7. Starter has two holes, fora) alignmentb) breather sump ventc) –d) –

8. For the same torque, starter is heavier than starter generator,a) starter generator has two separate windings

9. In Bryton Cycie DE shows…Figa) Expansion thru’ nozzle

10. Ni-metalic sensing is fitted ona) pressure regulating valveb) FCOC (fuel control oil cooler)c) Min flow valved) –

11. A) In FCU, variation in temperatures is compensated by Bi-mettalic disc (or)

12. If the metal found in the chip detector gives white light while burning, it confirms the presence of

a) steelb) Mgc) Crd) –

13. Exhaust nozzle area is changed due to heat after long operation, it will causea) the thrust to reduce for the amount of fuel flowb) the thrust will increase with the increase in EGTc) no appriciable change in thrust or EGT as the area is same for that temperatured) the thrust will increase due to increase of fuel flow due to more airflow through inlet

14. CODEP meansa) cobalt coatingb) coating given to LPT bladesc) coating given to improve the corrosion resistance in elevated temp of turbine bladesd) fuel additive

15. Mark the correct statementa) compressors are loaded in front stagesb) compressors are loaded more at rear stagesc) compressor are equally loadedd) –

16. Kevlar is used in fan casing fabrication. Al foil presence in kevlara) prevent stressb) acts as a lightening arresterc) used in light frequency operationd) –

17. BSI of HPT is done thorough the holes given. During insp the HPT shaft is rotated bya) remove starter and rotate through the starter engagement gearsb) drive pad is given for this purpose in the AGB section of these enginesc) after removing the combustion chamber only, BSI can be doned) 7/8” socket and spanner attached in the hand cracking pad

18. During water methanol injection at which place will increase the temperaturea) compressor inletb) diffuserc) compressor and diffuserd) –

19. Pressurising valve setting at low spring tension causes (or) adjustment of P&D valve on FCU is lower than the normal then..

a) hot start b) hung startc) –

20. Fog. Of Thrust reverser…identify the component a) blocker doorb) drag platec) T/R unlock pop-out indicator

21. Fig… Identify the bolt used in Hot Sectiona) A is used in hot sectionb) B is used in hot sectionc) B or C are used in hot sectiond) None of the above

22. Fig. Impeller tip speed of centrifugal compressor limits the performance of the compressor, this is because..

a) tip speed reaching mach nob) excessive compression

c) –

23. Fig. Of Magnetic seaa) A is magnetic ringb) B is magnetic ringc) C is magnetic ring

24. Mark the correct statement regarding usage of the Helical gears used in Turbo Prop gear boxa) helical gears are easy to manufacture and economicalb) helical gears takes more loads because they are straight

25. Dilution of air/fucl mix takes place ina) ?b) inner swril vanesc) outer swril vanes

26. If electronic control box is not fitted on APU, then..a) load control valve can be adjusted after shutdown of APUb) surge bleed valve operates on when no load control valvec) –

27. APU event marker indicatesa) No of APU shutdownb) No of APU startsc) Over temperatured) Starting including hung start

28. The purpose of feedback cable used in Thrust Reverser isa) to prevent fwd thrust selection, if they are in deployed conditionb) to bring back the thrust lever to idle in case, the doors move opposition to selection in either fwd

or reversec) both a & b are correctd) –

29. In Hyd. Mechanical Torquemeter torque is senced and transmitted bya) –b) –

30. FCU M.S.B.V. (?) high pressure symbol causes…?a) –b) –

31. For subsonic jet the inlet must have…a) –b) –

32. Fire extinguisher test provides…a) –b) –

33. Compressor fitted with layer turbot in…a) –b) –

34. Compressor blade dia…a) –b) –

35. Thermal efficiency of piston engine is higher than the jet engine is due to…a) –b) –

36. JPT crosses limits due toa) –b) –

37. Inlet of the hyd pump is blocked, then…a) –b) –

38. Efficient combustion cooling is…a) –b) –

39. Trimmer resister on EGT indication system ensuresa) a constant resistance valueb) increase / decrease in resistancec) adjust BPT as per requirements

40. In turbo shaft engine above 400 knots of speed increases (25000 ft altitude??)a) before sonic compression is lowb) compress ratio increases above sonic velocityc) –

41. Back up to NTSa) TSSb) Prop brakec) Safety coupling

42. Fig. Identify the componenta) Fuel pumpb) Oil pump

43. Fig. Identify the correct cockpit indication diagram.a) –b) –

44. Fig. Find out the stall angle…a) –b) –

45. Match the following:a) torque cam Turbine rotorb) torque hange compressorc) snoub turbine statord) lock taps combustion chamber

46. After the engine tight up, starter did not cuts off. The probable cause will bea) starter cut off circuit is faultyb) starter drive spring is weakc) starter bleed valve did not closed) either a or b is correct

47. Rotary air-oil separator is used ina) MGB to drain the oil pack sumpb) AGB to drain the oil back to sumpc) Bearing sump to remove air from the oil drainedd) Located in the MGB near the vent outlet, throws the oil outward to drain back in to the sump and

allow pressurizing air.

48. Hot shift and cold shift of modern engine is determined bya) CIT sensor probe condition

b) TIT sensor probe conditionc) Throttle lever angle and its position in conjunction with MECd) ITI sensor and CIT sensor condition.

49. Engine anti-icing system consists of ducting anda) heats up fwd and rearward simultanieouslyb) heats up fwd and rearward in cyclic operationc) consists of dual butterfly valve, which regulates the hot bleet air in relation with a timer circuit.d) Can be used both flight and ground operation.

50. LOP fight illuminated during flight. What are the other parameters in connection with it, the pilot has to check inside the cockpit indicators.

a) EGT and RPM indicator for the engine malfunctions.b) Ni rpm gauge and oil temperature gauge.c) Filter clogging light and EGTd) No indicator to check, but to cut off the engine

51. Igniter, plugs should not be touched with bare hand becausea) high radioactive material are used and it will cause radiation through the bodyb) tips are made up of tungsten carbid and it will get damagedc) –d) –

H.A. FEB-2002

1. a) What are the emergency/alternative L/G lowering systems? Explain the agency hydraulic system with diagram.b) What are the gauges & indication used for proper operation of a/c fuel system?c) What are the advantages & disadvantages of liquid O2 system in a/c? how is O2 bottle identified in a/c?

2. a) What are the inspections to be carried out on a/c pulley?b) Explain the performance of out servo airfoil with the neat diagram of its characteristic curve.c) What are the advantages of auto brake system? What are the components of the system? Draw its diagram.

3. a) What are the inspection carried out on control cables?b) What are the advantages of swept back wings?c) What is the purpose of safety relief valve in a/c pressurization system?d) Which are the types of rescovers used in a/c hydraulic system?

4. a) Write stepwise repair of the damaged skin where the core of the honey comb material has also been damaged?b) What are the safety features incorporated in air conditioning system of the a/c?c) Explain the smoke detection system used in cargo compartment. Describe with a neat diagram?

5. a) How will you detect leak in internal fuel system?b) What is mach trim system & how it functions?c) What are the precautions taken before operating flap system?d) What safety features are incorporated in a/c flap system?

6. a) Where external leaks are found in hydraulic system & here they are rectified?b) How stall warning is fold in the cockpit?c) What is ‘Q’ feed in a/c control system? How is it sensed? What are the used of ‘Q’ feel in a/c?

MCQ

1. Composite with high compressive strength - boron2. L/G lateral load taken by – Side strut3. Before fuel tank welding – purge with steam4. Composite for core – PVC & urathene5. ‘Flag Out’ goes out of view – when PWR is out6. Primary structures – Frame & longeron7. Wing heating due to engine location – will accelerate transition8. Flap over load valve – Retract flaps to prevent damage.9. Velocity increases – induced drag decreases10. L/G down causes – parasite drag11. Principle of AOA indicting system – not parallel to the true AOA of a/c12. Definition – wing bitt line13. Roof skin thickness is – less14. Stressed skin metal sing subjected to velocity – a group of rivet lead dipping15. Damage on wing tip & radame – will not affect a/c safety16. Static pr line disconnected inside pressurized cabin – ASI & altimeter read low17. L/G down enabling by orifice check valve18. Brake creeping – contamination of brake linings / glazing19. To check shock strut fluid level – release air & remove valve20. Cricket bull seam, rough surface – high Reynolds number, lift 21. T/Reverser principle – Newton’s law22. Fast erection of gyro hampered by –23. At the time of installation accelerometer should read + 1G24. Wind shield made of thermosetting plastic25. L.E flap made of – Al casting26. Intergranular corrosion – grain boundaries27. Sherordizing process – Dipped in molten Zn28. In a/c, air enter – reheater to turbine29. Gyros – terrain clearance30. Spoiler – Assist in roll control31. Remissible deviation in magnetic compass32. Compass caliberation, coefficient A is33. Compass compensation – divide by 834. If O2 system pr kept law – moisture accumulating35. Smoke clearance is part of – A/c system36. If peak temp goes high – temp control valve modulate close37. Purpose of fuel tank venting – to prevent damage, collapse suction38. A stripe mark rim to side wall of tyre. Slippage (creep) identification39. Annealing makes st. steel – removal stresses, soft machinative40. Gear type hyd pump is +ve displacement pump because – transfers uniform rol of fluid in each turn41. Resistance type temp indicator used – wheel stone bridge circuit42. Shear between layer takes place – within boundary layer43. A/C nose tip – stagnation pt, highest pr44. Plain flap on deflection - effective AOA

1. What are the hydraulic rivets pressurized upward?2. What are the GPWS operation modes?3. What are some of the l/p & o/p of Air Data Computer (ADC)?4. What will happen when a metal strip comes under L/G?5. How does a flap asymmetry system work?6. How is the L/G selected up & down?7. Explain the purpose & principle of operation of a shimmy damper?8. How the tyres will be removed if both the tyres of one side are worm out?9. Explain the process of jacking are side main L/G?10. How the shock strut lower pt is rigged?

HA (OCT-2000)

1. Air conditioning distribution system for modem a/c?2. a) Yaw damperb) Flap overload3. a) Induced drag b) Dynamic stability4. Hydraulic steering system with a neat sketch.5. Types of fire & smoke detector & explain phart electric cells with a sketch?6. Explain the operating principles of dilutes demand regulator?7. Tyre burst incident insp?8. a) Fuel vent system b) Fuel leak classification9. a) During normal operation what are the corrosion under which hydraulic low quantity indication occur?b) What is the purpose of L/G transit cylinder & when it comes to operation?10. Name the instrument which works in gyro & explain any one of them with principle & operation?

HA (OCT-2001)

1. What is dihedral angle & how its affects the a/c stability?2. How is operational check of L/G warning s/w carried out?3. What are the pressurization modes in a modern a/c? How is manual control carried out?4. Write the names of the eqpa/system which receive Air baler computer o/p?5. When are operational checks of Antiskid system carried out?6. What is the function of coalscent lag in air conditioning system?7. What is the manual reversal of flt control? Explain with an example?8. With a neat diagram explain the cabin temp regulation system?9. With a figure write the purpose of an adjustable tab?10. What is the purpose of a sequence valve in hydraulically operated L/G system?11. What is wing loading & how it diffects the landing speed of an a/c?12. How is air vent provided to the fuel tank? Give a diagram of vent in modem a/c fuel tanks?13. Why are hydraulic reservoirs pressurized & what are the sources for its presurisation?14. What are the precaution taken while working on oxygen system?15. What are the anti icing processes applied on modem a/c?16. What are the safely features involved in design of a horizontal stabilizer of a modem a/c?17. Why is surface coating applied on a re-in forced fabric component?18. How is delamination check carried out on a honey comb material used in a/c construction?

Paper-II September -1993

1. Alloy used for stringer is (a) 7075-T 76

(b) 7075-T 6(c) 7075-T 36(d) 7075-T 36&7075-T 73.

2. A+ Aerodynamics center the potching moment Co-efficient is (a) dependent upon co-efficient of lift (CL)(b) dependent upon co-efficient of lift & CP(c) constant and independent of CL(d) Dependent upon CL& center.

3. Mark the incorrect statement.(a) For minimum drag the lift co-efficient is equal to its lift dependent drag Co-efficient.(b) At higher incendents lift arises from difference between reductions on

upper & lower surface of wing.(c) For thin aerofoil of infinite aspect ratio in super sonic flow the aeroplynic center is at

50% of chord.(d) Activity factor is measured on power absorption of Air serves.

4. Location of c.p is a function of –Ref page automotive flight construction.

(a) Camber (b) CL (c) Camber & CL varies with angle of attack(d) Camber varies with angle of attack

5. The angle of attack at which fail moment is equal to using movement(a) Neutral point (b) Trim point (c) Stick fixed point (d) Stick free point @ s/p.

6. Degree of longitudinal stability is effected by relative position of both

(a) Center of pr & aerodynamic center (b) CP & CG(c) Aerodynamic center & C.G (d) Aerodynamic center & angle of attack 95/F.

7. Static Margin is the distance of 95/F(a) Aerodynamics center to neutral point(b) C.P is neutral point (c) CP&C.G(c) CG to neutral point

8. Tab used at high speed

(a) Servo tab(b) Balance tab (c) Spring tab (d) Trim tab 95/F

STRUCTURE

9. The station number is distance in enhance from(a) A yew reference point forward of fuselage(b) Reference point on the nose tip(c) Reference point at wing of empty a/c.(d) Reference point at the most forwarded C.G point of empty a/c

10. The languorous are(a) Rolled HAT section (b) Extracted z sections(c) Rolled & extracted z sections(d) Rolled & forged z sections.

11.Extensive use of metal biding in a/c constructions(a) Fatigue resistance only (b) Corrosion resistance of only power

(c) Fatigue & corrosion resistance (d) corrosion resistance wire

12. Inboard & king of taper rolled provide(a) Max thickness area of heavy loading(b) Min thickness area of reduced loading (c) Thickness skin at root and across fuselage.(d) Thickness at high tort ional loads

13. Plate between front and rear span(a) Has thickness tapered(b) Is butt spliced(c) Has tapered thickness and is but spliced(d) Has tapered thickness with flush fastness

14. Alloys use in a/c are hardened by(a) Cold working (b) Aging (c) Heat treatment(d) Chemical treatment.

INSTRUMENTS

15.In sensitive ASI the scale can be made liner by (a) Introducing banana shaped slat in the toothed wheel, which meshes with pointer percon (b) using turning spring (c) Keeping capsule in mathematically curved shape

(e) All the above.

16.Max safe airspeed criclicator(a) Does not require true temperature compensation(b) Require true max safe and total Airspeed(c) Has a subsidiary scales which can be set to max speed of given a/c and structure(d) None above is correct17. Mark the correct statement (a) There is no apparent wander of gyro at equator(b) If gyro is moved from north pole to south pole around earth surface than the apparent wonder would

change from counter clock wise to clock wise(c) Error due to apparent wonder at any point is to 15Lat/hr (latitude in degree)(d) All the above are correct.

18. In ratio meter type instrument(a) Coil carring stranger current moves in stronger part of it (b) No effect of flucations of input voltage(c) Controlling force provided by spring is quit stronger and has to counter balance

19. Artificial Horizon (a) Has a complete freedom 360 in roll and 85 freedom input is hat it is difficult But not impossible topple the horizon (b) Has a wonder rate of gyro less than 15 per hour(c) Has a gyro axis titled forward about 15 to compensate to rate of turning(d) All the above are correct.

20. If a/c alternates on easterly heading the compass will indicate(a) Apparent turn towards north(b) Apparent turn towards south(c) Doping of compass(d) None of the above.

21. Hear spring is a instrument (a) Is provided to negative back lash and statement(b) Serves as controlling force against reflecting force (c) Is strip of Nl, Fe alloy to sensitive to allows

greater amount of flux between the pole to pole temperature when temp increases + statement (d) None of the above

22. Air speed indicator measures(a) Dynamic pr (b) Dynamic-static pr(c) Dynamic+static pr (d) Staticpressure

23. Cabin altitude indicator is(a) An alternator calibrated to some pr latitude test as a normal altimeter(b) A bounden type pr gauge(c) Contains siphon open carbon(d) None of the above

24. Rate of climb indicator is(a) A different pr gauge to indicate rate of altitude change(b) Not a pr gauge sime operation depends upon static programme(c) Having, is most cases, a logarithmic scale as it is advantageous in start & statement(d) Effected by position error

25. Rate of climb indicator(a) Has two springs for selling range, which bears on stem connected to center piece.(b) With range setting spring to extent force of capsule to achieve relation between capsule pr deflection

characteristic(c) Has spring screws the upper row of screws to upper row of spring control rate of decent calibration (d) All above the are correct

26. Dip magnetic compass(a) Is caused by the horizontal component of earths magnetic field(b) Is called by vertical component of earth magnetic field(c) Is max at equator & min at poles(d) Both a & b are correct

27.If pilot tube is blocked airspeed indicator reading while sending will(a) Decrease (b) Increase (c) under speed (d) over head

28.ASI indicator can be modified to read(a) Equivalent air speed (b) Mach numbers (c) True air speed(e) All the above

AERO POLIT

29. In two phase induction motor type of serve motor of an auto pilot the reference phase is supplied by(a) 26v 50 Hz (b) 115v, 400Hz (c) 240v, 400Hz (d) 220v, 50

30.When automatic control is selected in electro HYDRAULIC auto pilot system(a) The engage com is out of detent(b) Engage signal is fed to the 5.0 volts(c) a & b(d) Pilot control valve is operated

31. The component different between position control servomechanism and speed control mechanism is(a) Serve motor (b) Techno generator (c) Potentiono meter (d) error detector

32.Mark the correct statement(a) Yaw damper will not oppose pedal movement of pilot (b) The speed monitor identifies speed a/c for application of control(c) In disengage condition of electro prumatic Autopilot the lines and pistons are retracted.(d) Under normal condition of load, the torque applied to input member by servo meter is transmitted

to intermediate member.

33. When control wheel is released in control wheel sterling the automatic control

(a) Holds a/c at originally selected altitude(b) Is provided by a pilot & Roll forces simultaneously pilot through force transactions(c) Holds the a/c a newly established altitude(d) Both b& c correct.

34.Wing leading edge using control achieved by(a) PrerumaticThermal & thermal system(b) Thermal & electrical system(c) Electrical & Alcohol system(d) All the above

35. Thix tropic Agent (a) Decreases stress(b) Decreases temp sensitivity(c) Increases stress(d) Increases temp sensitivity

36. Expansion slot in rotary brake discus assembly(a) Prevents excessive heat description(b) Prevents warping from heat(c) Enhance heat disruption(d) Increases efficiency of brakes system when brakes area

37. Mark the correct statement (a) Pr demand type of regulator is used for both crews(b) Pr demand type of regulator is used only for crew

38. Upper & lower bearing in main L/G shock strat programme(a) Only sliding surface between inner Souter cylinder(b) Only air seal between inner & outer cylinder(c) Only sliding surface with minimum friction(d) Sliding surface and air seal between inner souter cylinder

39. In HYD main L/G system the rate of gear extension is slowed by

(a) In build snubber design

(b) Check valve is upline

(c) Orifice check valve in down line

(d) Orifice check valve in upline

40. What prevents L/G from being retracted after has lowered

(a) Lock strut (b) Down lock & Lock strut (c) Down lock (d) Down lock & weight of the a/c

41. Some relief valves provide an overflow features to

(a) To provide pr lock (b) Prevents cavitations (c) Test reverse flow chalk valve

(e) Compensate for temperature variation

42. Mark incorrect statement

(a) HYD fuse is device to seal broken HYD line

(b) Follow up selector valves are used in L/G system

(c) Pr relief valves are priority valve

(d) Sequence valves are sprout type and by pass check valves

43. In angular type HYD pump the angle between cylinder block axis and drive shaft axis can be varied by

(a) Pr control unit

(b) Spring unit

(c) Contrail cylinder

(d) Swivel yoker

44.When sprout type hydraulic pr regulator is in KIKKED” in piston the directional sprout is in a position to direct pr to

(a) The pilot valve to keep it open

(b) The unloading valve to keep it closed.

(c) The unloading valve to it open

(d) The pilot valve to keep it closed.

45.Fittings used to attach the MLG to wings are secured with

(a) Interference fit

(b) Closed tolerame fit

(c) Both a & b

(d) Permanent type

46. Antiskid system

(a) Can use mechanical fly wheel type of skid detector

(b) Can use electrical & selectronic type skid detector

(c) Provides optimum braking and avoids dragging of wheel

(d) All the above are correct

47. Co lour Hyd system tabbing is

(a) Yellow, blue, Yellow

(b) White, blue, white.

(c) Blue, green, blue

(d) Light blue, Yellow, Colorless.

PRESSURISATION

48. A line from isobaric control valve to the throat of ambient venture

(a) A low pr reference to manual controller

(b) A low pr reference to auto controller

(c) A high pr reference to manual controller

(d) A high pr reference to auto controller

49. The rate of selection of pressurization system regulates rate of air flow between

(a) Control chamber & venture

(b) Rate chamber & venture

(c) Controller chamber & rate chamber

(d) Rate chamber & manual controller

50. Mark the correct statement

(a) Vacuum relief system provides automatic control signals only

(b) Vacuum relief system provides both auto & manual continue signals only

(c) Positive pr. Relief valve is built in to the flow valve

(d) Cabin barometric selector control landing field altitude

51. The purpose of negative pr relief valve is to

(a) Select pressurization at stations when aerodrome elevation below sea level

(b) Allow out –side air to enter fuselage when out side pr is greater than inside pressure

(c) Allow out flow to open when inside pr greater than ambient

(d) Half differential pr. Relief valve in case ambient pr become less than pr inside airplane

52.Turbine engine air is used for air conditioning & pressurization cooled

(a) Compressed air (b) Ram air (c) Conditioned air (d) Bleed-Air.

53. How the cabin of an a/c usually controlled

(a) By pressure automatic out flow that dumps all pressure excess of the amount for which it is

(b) By pr- sensitive valve that consents output of pressurization pump.

54. Cooling device in planes consist of

(a) Fam air, Ram air actuator, ACM

(b) Primary H.E., secondary H.E., and Fam air

(c) ACM, primary H.E., Fam air

(d) ACM, primary H.E., 7 secondary H.E.,

55. Air in pack is at lowest temperature at

(a) Out let of primary H.E.,

(b) Out let of secondary H.E.,

(c) Inlet of compressor

(d) Out let of turbine

56. Out flow valve is for

(a) A./c system only

(b) Pressurization systems only

(c) A/c & pressurization systems only

(d) A/c & recirculation only

57. In the event of pressurization failure protection by

(a) Positive pr. Relief valve

(b) Negative pr. Relief valve

(c) Servo valve

(d) Check valve

58.In pressurization system mode selection switch on ground

(a) For recirculation

(b) For ground operation

(c) For controlling cabin temp on ground

(d) For ground operation of ventilation systems

59. A small orifice in manual control pressurization valve provides

(a) High pr reference for manual controller

(b) High pr reference for auto controller

(c) A low pr reference for manual controller

(d) A low pr reference for auto controller

1. Centre of pressure is the point From which total lift four outs.2. The Static margin is The CG location which produce neutral statics3. If an a/c has directional static custability, displosure in YAW will cause – Directional devergenic4. The purpose of primary stups in flight controls system is to – Restrict the moment of the control to their current range5. If a gyroscope positional at a latitude has an opp drift of 15 sin its input axis would be alighned – local component of earth rate.6. The effect of an ocillation or wobbling of a gyrosonic spin axis is known as – nutation7. In connection with command signal processing, the function of adapting control system response to an a/c handling qualities known as – gain programming.8. In order to derive D.C. control signal having phase relationship as an A.C. signal, it is accurate for signals to be - demodulated9. In terms of pressure ratio, mach no is equivalent – P-s/s10. Heading hold signal from auto flight control system are supplied to the – roll channel11. AZIMUTH information during an ILS approach is provided by signals from – localiser transmitter.12. A parallel – connected servo motor is one which moves both appropriate flight control surfaces and pilots control.13. The to – from indicator of an HIS is in operates which only the VOR mode is selected.14. When failure data signals occurs, indication is given on EFIS display units by flags displayed in - yellow.15. Logic gates – ref page 275 auto flight