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.
DGCA Module 06
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
Answer
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
Answer
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
Answer
4. Bolt and bushing are fitted in aircraft.
A) Loosely
B) Tightly
C) Snugly
Answer
5. MTCS — 16 gauge.
A) Blue
B) Red
C) Yellow
Answer
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
Answer
7. Type of damage and defect in composite.
A) Crack
B) Cosmetic
C) Impact
D) Holes
Answer
8. The direction of fabric that run along the length (lengthwise).
A) Warp
B) Weft
C) Salvage
Answer
9. Minimum taper ratio of wood grain in the main wing spar.
A) 8:1
B) 10:1
C) 12:1
D) 14:1
Answer
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
Answer
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
Answer
12. The strength of which cannot increase by heat treatment.
A) Beryllium copper
B) Aluminum bronze
C) Muntz metal
D) Monel
Answer
13. Cast Al pronges having copper.
A) 89%
B) 90%
C) 80%
D) 85%
Answer
14. Which type of ray is used in radiography.
A) Alpha ray
B) Beta ray
C) Gamma ray
Answer
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
Answer
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
Answer
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
Answer
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
Answer
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
Answer
20. When great strength is required, used.
A) Screw
B) Bolt
C) Rivet
Answer
21. The type of corrosion which requires disassembly and inspection.
A) Intergranular corrosion
B) Surface corrosion
C) Dissimilar metal corrosion
Answer
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
Answer
23. The plastic cannot be reshaped once being cured by heat.
A) Thermoplastic
B) Monolithic
C) Thermosetting
Answer
24. Which lock bolt are used mainly in aircraft primary and secondary structure.
A) Stump type
B) Pull type
C) Blind type
Answer
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) Light hex nut AN 340 & AN 345
C) Wing nut AN 350
Answer
26. The type of self-locking nut currently in use are.
A) Boot self-locking nut
B) Elastic stop nut
C) Both
Answer
27. Muntz metal is a brass composed of.
A) 60% copper, 40% zinc
B) 40% copper, 60% zinc
C) 70% copper, 30% zinc
Answer
28. MTCS – Corrosion color.
A) A surface of Al alloy is white powdery deposit.
B) Magnesium – gray.
C) Copper – red.
Answer
29. Barcol method requires the voltages.
A) Voltage between 4 & 6 volt.
B) Voltage between 8 to 12 volt.
C) Voltage 230 volt.
Answer
30. The thickness of cadmium plating deposit is dependent upon.
A) Voltage & current.
B) Time & voltage.
C) Time & current density.
Answer
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.
Answer
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.
Answer
33. MTCS — Class 1 fit can easily be turned with fingers.
A) True.
B) False.
C) None.
Answer
34. The most common rotating beam or rotating cantilever test of the material.
A) Torsion test.
B) Fatigue test.
C) Impact test.
Answer
35. Aircraft flaring tool must have flaring angle of.
A) 40–47 degree.
B) 35–37 degree.
C) 45–47 degree.
Answer
36. In aircraft fluid lines fitting flaring angle is used.
A) 35°.
B) 37°.
C) Both a & b.
Answer
37. The spring which is formed by the layers of spring.
A) Torsion.
B) Leaf spring.
C) Helical compression.
Answer
38. The nut in which desired tightness can be obtained with the fingers.
A) Hex head nut
B) Plain check nut
C) Wing nut
Answer
39. Class 2 fit is.
A) Free fit.
B) Close fit.
C) Loose fit.
Answer
40. Inconel is.
A) Nickel–chromium steel alloy.
B) Nickel–chromium iron alloy.
C) Copper and zinc alloy.
Answer
41. —- is high in hardness, strength, and corrosion resistant properties.
A) High carbon steel
B) Nickel steel
C) Chrome–nickel
D) Chromium steel
Answer
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
Answer
43. Rivets used for riveting nickel steel alloy.
A) Mild steel rivet
B) CRS rivet
C) Monel rivet
Answer
44. Helical shape formed by wire & strands called.
A) Core strand
B) Pitch
C) Lay
Answer
45. 7 × 9 cable means.
A) Nineteen strands for seven wire each
B) Seven strands of nineteen wire each
C) Both
Answer
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
Answer
47. Process of forming a product by hammering or pressing.
A) Forging
B) Casting
C) Both
Answer
48. Which is formed by layers of flat spring.
A) Spiral spring
B) Leaf spring
C) Helical spring
Answer
49. Lubrication of bearing :- No lubricant area of rubbing contact between element & cage.
A) Protection from corrosion
B) Dissipate heat
C) ATA
Answer
50. NAS.
A) National aircraft standard
B) National aviation standard
C) Navigational aircraft standard
Answer
51. What is type rivet use in interior structure.
A) universal
B) round head
C) braizer head
Answer
52. Melting point of steel.
A) 2600 F
B) 1100 F
C) 1300–1600 F
Answer
53. Nickel contain steel is.
A) hardness
B) tensile strength
C) both
D) ductility
Answer
54. Ability of a material to resist abrasion penetration and cutting action.
A) Strength
B) Hardness
C) Ductility
Answer
55. Common cable.
A) 7×7 and 7×19
B) 7×9 and 1×19
C) 1×19 and 1×7
Answer
56. Turnbuckle is.
A) Two threaded terminal and barrel
B) Two threaded terminal
C) One threaded terminal and other barrel
Answer
57. 7 × 9 cable means.
A) nineteen strands for seven wire each
B) seven strands of nineteen wire each
C) both
Answer
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.
Answer
59. Phosphate ester base fluid which type hose use.
A) Neo prene
B) Buna N
C) Butyl
D) All
Answer
60. Hydraulic pressure test for hose.
A) 1.5 time operating pressure
B) 3 time operating pressure
C) both
Answer
61. Steel tubing identify by.
A) factory and manufacture trade name
B) SAE Number
C) Containing toxic material
D) All
Answer
62. Chromium vanadium made for.
A) 18% Cr
B) 1% Cr
C) 18% vanadium and 1% Cr
Answer
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.
Answer
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
Answer
65. Disadvantage of cable link.
A) not flexible
B) frequent adjustment of cable
C) high weight
Answer
66. Melting point of steel.
A) 2600 F
B) 1100 F
C) 1300–1600 F
Answer
67. How many require gear in compound train.
A) 1
B) 2
C) 3
D) 4
Answer
68. Hacksaw blade teeth are.
A) 12 to 14 TPI
B) 14 to 32 TPI
C) 14 to 42 TPI
Answer
69. Factors affecting corrosion.
A) Climate
B) Dust oil
C) Foreign material
D) All
Answer
70. Nitriding.
A) Heat treatment process
B) Case hardening
C) Annealing