DGCA Module 06

DGCA Module 06 Materials and Hardware 4th Session 2018 exam is focused on aircraft construction materials, including metals, alloys and composites. It explains corrosion prevention, heat treatment, identification of fasteners, bearings, locking devices and safety wiring practices necessary for safe and effective aircraft maintenance.

3rd Session of 2018

1. The most common aircraft cable used is.

A) 1×7 & 7×19

B) 7×7 & 7×19

C) 1×6 & 6×19

2. The extra flexible cable used in aircraft.

A) Used in primary control

B) As in (A) & not adjusted frequently

C) As in (B) & 7×19

3. When copper wire is replaced by Al wire.

A) Copper wire 2 times larger than Al wire

B) Copper wire 6 times larger than Al wire

C) Al wire is 2 times larger than copper wire

4. Bolt and bushing are fitted in aircraft.

A) Loosely

B) Tightly

C) Snugly

5. MTCS — 16 gauge.

A) Blue

B) Red

C) Yellow

6. MTCS — The wire is displayed in yellow when the gauge number is from.

A) 10 to 15

B) 18 to 22

C) 16 to 18

7. Type of damage and defect in composite.

A) Crack

B) Cosmetic

C) Impact

D) Holes

8. The direction of fabric that run along the length (lengthwise).

A) Warp

B) Weft

C) Salvage

9. Minimum taper ratio of wood grain in the main wing spar.

A) 8:1

B) 10:1

C) 12:1

D) 14:1

10. In compound gear train.

A) It is a series of gears with two of internally gear mounted on the same shaft

B) As in (A) and rotate at same speed

C) As in (B) having at least 4 gears

D) As in (C) having at least 6 gears

11. In four digit of index system of Al & Al alloy, the second digit indicates.

A) Alloy type

B) Special modification

C) Percentage of middle carbon range

12. The strength of which cannot increase by heat treatment.

A) Beryllium copper

B) Aluminum bronze

C) Muntz metal

D) Monel

13. Cast Al pronges having copper.

A) 89%

B) 90%

C) 80%

D) 85%

14. Which type of ray is used in radiography.

A) Alpha ray

B) Beta ray

C) Gamma ray

15. A file test is a method of determining the hardness of.

A) A piece of material by trying to cut into it with the corners of a file

B) A piece of material by trying to cut into it without the corners of a file

C) Both

16. In needle bearing.

A) The length of the roller is equal to the dia of the roller

B) The length of roller is many times longer than dia

C) The dia of the roller is 2 times larger than roller

17. A corroding action will take place if metal contacts with metal in the presence of moisture.

A) 2117 & 2017

B) 3003 & 5052

C) 6053 & 7075

18. Which rivet are used in the interior of the aircraft where clearance is not required.

A) Round head rivet

B) Brazier head rivet

C) Universal head rivet

19. Which screw are used for attaching removable parts such as name plate to casting & parts in which screw cut in own threads.

A) Self tapping screw

B) Drive screw

C) Machine screw

20. When great strength is required, used.

A) Screw

B) Bolt

C) Rivet

21. The type of corrosion which requires disassembly and inspection.

A) Intergranular corrosion

B) Surface corrosion

C) Dissimilar metal corrosion

22. The elastic stop nut is not installed where the temperature.

A) Not exceed 120°F

B) Not exceed 250°F

C) Not exceed 260°F

23. The plastic cannot be reshaped once being cored by heat.

A) Thermoplastic

B) Monolithic

C) Thermosetting

24. Which lock bolt are used mainly in aircraft primary and secondary structure.

A) Stump type

B) Pull type

C) Blind type

25. The use where the desired tightness can be obtained with the finger and where the assembly is frequently removed.

A) Plane check nut AN 316

B) The light hex nut AN 340 & AN 345

C) The wing nut AN 350

26. The type of self-locking nut currently in use are.

A) Boot self-locking nut

B) Elastic stop nut

C) Both

27. Muntz metal is a brass composed of.

A) 60% copper, 40% zinc

B) 40% copper, 60% zinc

C) 70% copper, 30% zinc

28. MTCS – Corrosion color.

A) A surface of Al alloy is white powdery deposit.

B) Magnesium – gray.

C) Copper – red.

29. Barcol method requires the voltages.

A) Voltage between 4 & 6 volt.

B) Voltage between 8 to 12 volt.

C) Voltage 230 volt.

30. The thickness of cadmium plating deposit is dependent upon.

A) Voltage & current.

B) Time & voltage.

C) Time & current density.

31. Simple gear train consists of two or more gears mounted on separate shaft.

A) As in (a) & even number of gears rotate same direction.

B) As in (a) & odd number of gears rotate opposite direction.

C) As in (a) & all gears rotate opposite direction.

D) As in (a) even number of gears rotate opposite direction.

32. Miter gears is.

A) It is mating the bevel gears.

B) It mating the worm gears.

C) When meshed with gear used to change rotary motion to reciprocating motion.

D) Gear pinion.

33. MTCS — Class 1 fit can easily be turned with fingers.

A) True.

B) False.

C) None.

34. The most common rotating beam or rotating cantilever test of the material.

A) Torsion test.

B) Fatigue test.

C) Impact test.

35. Aircraft flaring tool must have flaring angle of.

A) 40–47 degree.

B) 35–37 degree.

C) 45–47 degree.

36. In aircraft fluid lines fitting flaring angle is used.

A) 35°.

B) 37°.

C) Both a & b.

37. The spring which is formed by the layers of spring.

A) Torsion.

B) Leaf spring.

C) Helical compression.

38. The nut in which desired tightness can be obtained with the fingers.

A) Hex head nut

B) Plain check nut

C) Wing nut

39. Class 2 fit is.

A) Free fit.

B) Close fit.

C) Loose fit.

40. Inconel is.

A) Nickel–chromium steel alloy.

B) Nickel–chromium iron alloy.

C) Copper and zinc alloy.

41. —- is high in hardness, strength, and corrosion resistant properties.

A) high carbon steel

B) nickel steel

C) chrome–nickel

D) chromium steel

42. Aircraft bolt screws & nuts are threaded in.

A) NF threads

B) as in (a) + aircraft threads

C) as in (b) + UNF thread

D) as in (c) + UNC threads

43. Rivets used for riveting nickel steel alloy.

A) mild steel rivet

B) CRS rivet

C) monel rivet

44. Helical shape formed by wire & strands called.

A) core strand

B) pitch

C) lay

C) pitch

45. 7 × 9 cable means.

A) nineteen strands for seven wire each

B) seven strands of nineteen wire each

C) both

46. For which of the corrosion treatment as structural repair manual (SRM) is needed.

A) corrosion repairable by patching

B) as in (a) + repairable by inspection

C) corrosion with negligible damage

47. Process of forming a produce by hammering or pressing.

A) forging

B) casting

C) both

48. Which is formed by layers of flat spring.

A) spiral spring

B) leaf spring

C) helical spring

49. Lubrication of bearing :- No lubricant area of rubbing contact between element & cage.

A) protection from corrosion

B) dissipate heat

C) ATA

50. NAS.

A) national aircraft standard

B) national aviation standard

C) navigational aircraft standard

51. What is type rivet use in interior structure.

A) universal

B) round head

C) braizer head

52. Melting point of steel.

A) 2600 F

B) 1100 F

C) 1300–1600 F

53. Nickel contain steel is.

A) hardness

B) tensile strength

C) both

D) ductility

54. Ability of a material to resist abrasion penetration and cutting action.

A) Strength

B) Hardness

C) Ductility

55. Common cable.

A) 7×7 and 7×19

B) 7×9 and 1×19

C) 1×19 and 1×7

56. Turnbuckle is.

A) Two threaded terminal and barrel

B) Two threaded terminal

C) One threaded terminal and other barrel

57. 7 × 9 cable means.

A) nineteen strands for seven wire each

B) seven strands of nineteen wire each

C) both

58. Cable inspection.

A) process, inspect cables for corrosion by hand cleaning of short sections with solvent soaked cloths.

B) As in A and external corrosion is evident, relieve tension and check the cable for internal corrosion.

59. Phosphate ester base fluid which type hose use.

A) Neo prene

B) Buna N

C) Butyl

D) All

60. Hydraulic pressure test for hose.

A) 1.5 time operating pressure

B) 3 time operating pressure

C) both

61. Steel tubing identify by.

A) factory and manufacture trade name

B) SAE Number

C) Containing toxic material

D) All

62. Chromium vanadium made for.

A) 18% Cr

B) 1% Cr

C) 18% vanadium and 1% Cr

63. Allowance.

A) intentional difference in dimension of mating part or minimum clearance that can be allowed between mating parts.

B) Unintentional error in machining of parts.

C) Tolerance allowed for surface finish only.

64. Clearance.

A) difference in size between mating part s where the outside dimension of smaller than inside dimension of the other.

B) Difference in size where the outside dimension is larger than the inside dimension.

C) Intentional error provided for interference fit

65. Disadvantage of cable link.

A) not flexible

B) frequent adjustment of cable

C) high weight

66. Melting point of steel.

A) 2600 F

B) 1100 F

C) 1300–1600 F

67. How many require gear in compound train.

A) 1

B) 2

C) 3

D) 4

68. Hacksaw blade teeth are.

A) 12 to 14 TPI

B) 14 to 32 TPI

C) 14 to 42 TPI

69. Factors affecting corrosion.

A) Climate

B) Dust oil

C) Foreign material

D) All

70. Nitriding.

A) Heat treatment process

B) Case hardening

C) Annealing

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