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Paper II1. A new piece of tube cut 10% longer for

1. Bending. 2. Minor vibration in bending 3. Coupling. 4. None2. The marking of solid shank rivet head indicates

1. Size of rivet 2. Material of rivet. 3. Head style 4. None3. Helicoids are precision formed screw thread coils made up of

1.18-8 stainless steel. 2. As in 1 have a circular cross section

3. As in2 &provide protection to the thread cut into casting made of soft metal4. As in 3 & to be installed in the field when thread in casting are stripped out4. Grip length of bolt is the

1. Total length of bolt. 2. Length of the threaded portion3. Length of the unthreaded portion with head. 4. None is correct

5. Chief reason for replacement of cupper tubing by aluminum alloy or CRS tubing is due to1. Low fatigue factor of copper tube. 2. High fatigue factor of copper tube3. High aging factor of copper tube

6. External brake lines should be always made of 1. Monel metal. 2. Annealed CRS. 3. 7075 alloy. 4. 6053 alloy

7. The useful load of an a/c consist of the

1. Crew, Fuel, Passenger, and cargo. 2. Crew, fuel, oil, and fixed equipments3. Crew, Passenger, fuel, oil, cargo, and fixed equipments,4. Crew, power plant, fuel, oil, cargo, and passenger

8. In the theory of weight & balance what is the name of distance from the fulcrum to an object1. Lever arm. 2. Beam length. 3. Balance arm. 4. Fulcrum arm.

9. The empty weight of an airplane is determined by1. Adding the gross weight on each weighing points and multiplying by the measured distance

to the datum.2. Adding the net weight of each weighing point and multiplying the measured distance to the datum3. Subtracting the tare weight from the scale reading and adding the weight of each weighing point4. Multiplying the measure distance from each weighing point to the datum times the sum of scale

reading less the tare weight.10. When dealing with weight and balance of an a/c, the term maximum weight is interpreted to meanthe minimum

1. Weight of the empty a/c. 2. Weight of the useful load. 3. Authorised weight of a/c and its contents4. Weight of all optional or special equipment that can be installed in the a/c.

11. The most important reason for a/c weight and balance control in today a/c is1. Efficiency in-flight. 2. To reduce noise level. 3. Safety. 4. To increase pay loads.

12. The amount of fuel for computing empty weight and corresponding CG is1. Empty fuel tanks. 2. Unuseable fuel. 3. Full fuel tanks. 4. The amount of fuel necessary for an hour of operation.

13. A fuel that vaporize too readily may cause

1. Hard starting. 2. Detonation. 3. Slow warm up. 4. Vapour lock.14. Characteristics of aviation gasoline are1. High heat value, high volatility. 2. High heat value, low volatility.3. Low heat value, high volatility. 4. Low heat value, low volatility.

15. Which of the metal has the most tendencies to oxidize?1. Magnesium. 2. Aluminum. 3. Cadmium. 4. Zinc.

16. Stress corrosion can be prevented by1. Painting the outer surface. 2. Shot peening. 3. Grit blasting. 4. Electroplating.

17. Alodizing is a chemical treatment for aluminum alloy to improve their paint bonding quality and to1. Relieve internal stress. 2. Increase corrosion resistance. 3. Decrease corrosion resistance

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4. Making the surface slightly anodic.18. A chemical treatment to ferrous metal which convert the surface to non metallic oil absorptive phosphate

coating to reduce wear 1. Bondersing. 2. Colesterising. 3. Granodising. 4. None.

19. Rivet smoking is related to which type of corrosion1. Fill form. 2. Fretting. 3. Stress. 4. Exfoliation.

20. Which type of corrosion occurs in stainless steel when it is welded?1. Fretting. 2. Surface. 3. Intergranular. 4. Both 2 & 3 are correct.

21. What is the advantage of a double flare on aluminum tubing?1. It is less concentric than a single flare. 2. Ease of construction3. It is less resistant to the shearing effect of torque.4. It is more resistant to the shearing effect of torque.

22. The maximum distance between end fittings to which a straight hose assembly is to be connected is 50inches .The minimum hose length to make such a connection should be1. 54.5 inches. 2. 50-3/4 inch 3. 51 inches. 4. 52-1/2 inches

23. A scratch or nick in aluminum alloy tubing can be repaired by burnishing provided the scratch or nick doesnot

1. Exceed 5% of tube diameter. 2. Appear in the heel of a bend in the tube.3. Exceed 20% of the wall thickness of the tube. 4. Exceed 10 % of the tube dia.

24. If too much time is allowed to elapse during the transfer of 2017 & 2024 aluminums alloyfrom the heat treatment medium to the quench tank ,it may result in1. Case hardening. 2. A dull stained or streaked surface.3. Retarded age hardening. 4. Impaired corrosion resistance

25. Nitriding is a process in which1. Forms a hard case on apart to resist wear. 2. Decrease the size of the grain structure3. Toughens steel to increase its tensile strength. 4. Increase bearing heat resistance

26. Which type of steel is best suited for case hardening1. Low carbon, low alloy. 2. High carbon, low alloy.3. Low carbon high alloy. 4. High carbon, high alloy

27. Aircraft bolts with across or asterisk marked on the bolt head are

1. Made of stainless steel. 2. Made of aluminum alloy.3. Close tolerance bolt. 4. Standard steel bolt.

28. A fiber type self locking nut must never be used on an a/c if the bolt is1. Under shear loading. 2. Under tension loading3. Subject to rotation. 4. To be removed in a vertical position.

29. What is used to remove corrosion from highly stressed steel surface1. Steel wire brushes. 2. Fine grit aluminum oxide.3. High speed wire buffing. 4. Medium grit carborundam paper

30. The interior surface of sealed structural steel tubing is best protected against corrosion by1. Purging the interior with dry air before sealing. 2. A coating of hot linseed oil.3. Evacuating the tubing before sealing.

31. In SAE numbering system 2 indicates1. Nickle steel. 2. Chromium steel. 3. Nickle chromium. 4. Molybdenum steel.

32. The brinell is the1. Load in kilogram divided by area of the spherical surface of the impression in square inch.2. Load in pound divided by area of the spherical surface of the impression in square inch.3. Load in kilogram divided by the area of the spherical surface of the impression in square mm.4. Load in pounds multiplied by the area of the spherical surface of the impression in millimeter.

33. Penetration hardness is possessed by1. Manganese. 2. Nickle. 3. Chromium. 4. Both 1 & 3 are correct

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34. In aluminum annealed condition is designated by1.O. 2. A. 3. H. 4.T.

35. Alclad consists of 1. Pure aluminum coated with an aluminum alloy. 2. Aluminum alloy coated with pure aluminum.3. Pure aluminum coated with magnesium alloy. 4. Magnesium alloy coated with pure aluminum.

36. Hardness is obtained by1. Slow cooling. 2. Slow heating. 3. Rapid heating. 4. Rapid cooling.

37. Cutting tools retain hardness at dull redness because of presence of 1. Titanium. 2. Cobalt. 3. Tungsten. 4. Molybdenum.

38. While tempering the hardened chisel, the colour of the cutting edge at which it is to be dipped in water 1. Purple brown. 2. Blue. 3. Brown. 4. Yellow.

39. Anti corrosion treatment given to aluminum alloy is1. Chromating. 2. Nitriding. 3. Galvanising. 4. Anodising.

40. A double flare should be used on1. Steel alloy. 2. 2024 al-alloy. 3. 5052 O al-alloy. 4. None of these.

41. Hi shear rivets has same shear strength1. Nuts of equal dia. 2. Bolts of equal dia. 3. Both 1 &2. 4. None

42. Hi-shear rivet are classified as1. Blind rivet. 2. Self plugging. 3. Mechanical lock rivet. 4. None of the above.

43. The material of the Rivnut is1. 5053 Al.-alloy. 2. 6063. Al-alloy. 3. 7075 Al- alloy. 4. 1100 Al-alloy.

44. AN 950 washer is1. Lock washer. 2. Shake proof washer. 3. Ball socket & seat washer. 4. Plain washer

45. If a tube burst or cracks, it is generally the result of successive1. Vibration. 2. Improper installation. 3. Collision. 4. All

46. During maintenance of cable in control system.1. Clean cable by suitable solvent. 2. Clean cable by any type of solvent.3. Clean cable with wet cloth. 4. Cable should be cleaned with dry cloth.

47. The diameter of DZUS fastener is measure by1. 16 th of an inch. 2. 100 th of an inch.

3. As in 2 and the length of the stud is the distance from the head of the stud to the bottom of the spring hole.

4. As in 1 & quarter clockwise turn is require to fastened the member.48. S peed nut are used

1. with self-tapping screw. 2. With machine screw. 3. in non structural location4. None of the above

49. Re-usable flexible hose fitting uses1. Swaged fittings. 2. Socket, nut & nipple. 3. Beaded end fitting. 4. All are correct.

50. The term aircraft plumbing refer 1. Hose. 2. Tubing. 3. Fitting. 4. All the above.

51. In magnetic test, which material is non- magnetic

1. Monel. 2. Nickel steel. 3. Pure nickel. 4. None of these.52. The color code of 3003 al-alloy tubing

1. White. 2. Green. 3. Gray. 4. Red53. Which type of rubber is an excellent material to used with phosphate ester based hydraulic fluid

(skydrol)1. Buna-N. 2. Buna-S. 3. But. 4. Neoprene.

54. When safety-wiring closely spaced bolts1. A group of three should be the maximum in series.2. Number that can be safety-wired by a 24 length of wire is the maximum in a series.3. A group of five should be the maximum in a series.

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4. There is no such restriction in safety wiring.55. Grub screw

1. Is a headless screw. 2. Has round head. 3. Flat head4. As in 1 and used with self locking nut

56. Which nut should not be used when temp is more than 250 0C1. Elastic stop nut. 2. Sheet spring nut. 3. Boots self locking nut.

57. Shake proof lock washer are1. Round washer. 2. As in (1) and designed with tabs3. As in (2) and tap is bent upwards. 4. As in (3) and tab is bent downwards.

58. The materials of studs of dzus fasteners1. Steel and cadmium plated. 2. Steel and chromium plated.3. As in (1) and designed in 3 head style. 4. As in (2) and designed in 3 head style.

59. A/C control cables are fabricated from1. Carbon steel. 2. Stainless steel. 3. Both 1and 2 are correct.4. None.

60. The contamination of water in aviation Fuel is permitted upto1. 30 PPM. 2. 20 PPM. 3. 7 PPM.

61. What is the purpose of Lump Valve1. To jettison the fuel. 2. To transfer fuel from one tank to other.

3. To dump the fuel after emergency.62. The special washer used with Internal wrenching bolt is

1. NAS 143 & 143C. 2. MS 20002 & MS 20002C. 3. Both 1 and 2 are correct.4. NAS 143 & MS 20002.

63. The bolt head is marked with either recessed or raised triangle, the bolt is1. NAS close tolerance bolt. 2. Close tolerance bolt. 3. Std bolt. 4.CAS bolt.

64. The length of clevis bolt is measured in1. 16 th of an inch. 2. 8 th of an inch. 3. 32 nd of an inch.

65. Incase of V rings the open end of V should always be1. Face the pressure. 2. Away from the pressure. 3. Anyway can be put.

66. Wipers are

1. Static seals. 2. Used to clean exposed portion of piston shafts3. As in (2) also prevents dirt entering the system. 4. As in (3) & made of Neoprene.

67. Anodising is a chemical treatment1. For all Al alloys. 2. Only clad surface. 3. Only Non-clad surfaces.4. As per situation it demands.

68. What is to be used to clean surfaces oil, hyd fluid, grease from a/c tyre1. Aliphatic Naptha. 2. Aromatic Naptha. 3. Mild soap solution. 4. Water.

69. MS 20470 is a1. Flat head rivet. 2. CSK head rivets. 3. Brazier head. 4. Universal head rivets.

70. If a rivets is marked with recessed double dots on its head, the rivets is1. Monel. 2. Aluminium. 3. Brass. 4. Titanium.

71. The letter F indicates that rivets materials is1. CRS. 2. Carbon steel. 3. Inconel. 4. None.

72. Tank lining for aromatic aviation gasoline is made of 1. Buna. 2. Neoprene. 3. Thikol. 4. Butyl rubber.

73. Magnesium alloy casting are solution heat treated1. To lower tensile & ductility. 2. As in (1) & also shock resistance.3. As in (1) & also shock resistance. 4. All are correct.

74. Most widely used alloy in a/c construction are hardened by1. Heat treatment. 2. Cold worked. 3. Hot worked. 4. None

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75. Which of the following is having lowest fusing temperature1. Eutectoid. 2. Hypo-eutectoid. 3. Hyper-eutectoid. 4. Pearlite.

76. Black pitting & reddish brown corrosion occurs on1. CRS. 2. Cast Iron. 3. Magnesium. 4. Aluminium.

77. AN 545 is a1. Machine screw nut. 2. Slotted engine nut. 3. Wing nut. 4. Shear castle nut.

78. Type of rivet to be installed on an aerodynamically smooth surface or if clearance of an assembly is needed1. CSK rivets. 2. Round head. 3. Flat head. 4. Brazier head.

79. Alclad surfaces1. Are to be left unpainted. 2. As in (1) & require no anodic treatment. 3. Both statements are wrong.

80. Solvent & Emulsion type cleaner are1. Heavy duty cleaner. 2. Light duty cleaner. 3. Medium duty cleaner. 4. All the above.