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
B) 7×7 & 7×19
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
Answer
A) Used in primary control
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
C) Al wire is 2 times larger than copper wire
4. Bolt and bushing are fitted in aircraft.
A) Loosely
B) Tightly
C) Snugly
Answer
B) Tightly
5. MTCS — 16 gauge.
A) Blue
B) Red
C) Yellow
Answer
B) Red
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
C) 16 to 18
7. Type of damage and defect in composite.
A) Crack
B) Cosmetic
C) Impact
D) Holes
Answer
D) Holes
8. The direction of fabric that run along the length (lengthwise).
A) Warp
B) Weft
C) Salvage
Answer
A) Warp
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
B) 10:1
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
Answer
C) As in (B) having at least 4 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
Answer
B) Special modification
12. The strength of which cannot increase by heat treatment.
A) Beryllium copper
B) Aluminum bronze
C) Muntz metal
D) Monel
Answer
D) Monel
13. Cast Al pronges having copper.
A) 89%
B) 90%
C) 80%
D) 85%
Answer
A) 89%
14. Which type of ray is used in radiography.
A) Alpha ray
B) Beta ray
C) Gamma ray
Answer
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
Answer
A) A piece of material by trying to cut into it with the corners of a file
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
B) The length of roller is many times longer than dia
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
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
Answer
A) Round 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
Answer
A) Self tapping screw
20. When great strength is required, used.
A) Screw
B) Bolt
C) Rivet
Answer
B) Bolt
21. The type of corrosion which requires disassembly and inspection.
A) Intergranular corrosion
B) Surface corrosion
C) Dissimilar metal corrosion
Answer
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
Answer
B) Not exceed 250°F
23. The plastic cannot be reshaped once being cured by heat.
A) Thermoplastic
B) Monolithic
C) Thermosetting
Answer
C) Thermosetting
24. Which lock bolt are used mainly in aircraft primary and secondary structure.
A) Stump type
B) Pull type
C) Blind type
Answer
B) Pull 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) Light hex nut AN 340 & AN 345
C) Wing nut AN 350
Answer
C) 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
Answer
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
Answer
B) 40% copper, 60% zinc
28. MTCS – Corrosion color.
A) A surface of Al alloy is white powdery deposit.
B) Magnesium – gray.
C) Copper – red.
Answer
A) A surface of Al alloy is white powdery deposit.
29. Barcol method requires the voltages.
A) Voltage between 4 & 6 volt.
B) Voltage between 8 to 12 volt.
C) Voltage 230 volt.
Answer
B) Voltage between 8 to 12 volt.
30. The thickness of cadmium plating deposit is dependent upon.
A) Voltage & current.
B) Time & voltage.
C) Time & current density.
Answer
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.
Answer
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.
Answer
A) It is mating the bevel gears.
33. MTCS — Class 1 fit can easily be turned with fingers.
A) True.
B) False.
C) None.
Answer
A) True.
34. The most common rotating beam or rotating cantilever test of the material.
A) Torsion test.
B) Fatigue test.
C) Impact test.
Answer
B) Fatigue test.
35. Aircraft flaring tool must have flaring angle of.
A) 40–47 degree.
B) 35–37 degree.
C) 45–47 degree.
Answer
B) 35–37 degree.
36. In aircraft fluid lines fitting flaring angle is used.
A) 35°.
B) 37°.
C) Both a & b.
Answer
C) Both a & b.
37. The spring which is formed by the layers of spring.
A) Torsion.
B) Leaf spring.
C) Helical compression.
Answer
B) Leaf spring.
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
C) Wing nut
39. Class 2 fit is.
A) Free fit.
B) Close fit.
C) Loose fit.
Answer
A) Free fit.
40. Inconel is.
A) Nickel–chromium steel alloy.
B) Nickel–chromium iron alloy.
C) Copper and zinc alloy.
Answer
B) Nickel–chromium iron alloy.
41. —- is high in hardness, strength, and corrosion resistant properties.
A) High carbon steel
B) Nickel steel
C) Chrome–nickel
D) Chromium steel
Answer
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
Answer
D) as in (c) + UNC threads
43. Rivets used for riveting nickel steel alloy.
A) Mild steel rivet
B) CRS rivet
C) Monel rivet
Answer
C) Monel rivet
44. Helical shape formed by wire & strands called.
A) Core strand
B) Pitch
C) Lay
Answer
C) Lay
45. 7 × 9 cable means.
A) Nineteen strands for seven wire each
B) Seven strands of nineteen wire each
C) Both
Answer
B) Seven strands of nineteen wire each
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
B) As in (a) + repairable by inspection
47. Process of forming a product by hammering or pressing.
A) Forging
B) Casting
C) Both
Answer
A) Forging
48. Which is formed by layers of flat spring.
A) Spiral spring
B) Leaf spring
C) Helical spring
Answer
B) Leaf spring
49. Lubrication of bearing :- No lubricant area of rubbing contact between element & cage.
A) Protection from corrosion
B) Dissipate heat
C) ATA
Answer
A) Protection from corrosion
50. NAS.
A) National aircraft standard
B) National aviation standard
C) Navigational aircraft standard
Answer
A) National aircraft standard
51. What is type rivet use in interior structure.
A) universal
B) round head
C) braizer head
Answer
A) universal
52. Melting point of steel.
A) 2600 F
B) 1100 F
C) 1300–1600 F
Answer
C) 1300–1600 F
53. Nickel contain steel is.
A) hardness
B) tensile strength
C) both
D) ductility
Answer
C) both
54. Ability of a material to resist abrasion penetration and cutting action.
A) Strength
B) Hardness
C) Ductility
Answer
B) Hardness
55. Common cable.
A) 7×7 and 7×19
B) 7×9 and 1×19
C) 1×19 and 1×7
Answer
A) 7×7 and 7×19
56. Turnbuckle is.
A) Two threaded terminal and barrel
B) Two threaded terminal
C) One threaded terminal and other barrel
Answer
A) Two threaded terminal and barrel
57. 7 × 9 cable means.
A) nineteen strands for seven wire each
B) seven strands of nineteen wire each
C) both
Answer
B) seven strands of nineteen wire each
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
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
Answer
C) Butyl
60. Hydraulic pressure test for hose.
A) 1.5 time operating pressure
B) 3 time operating pressure
C) both
Answer
A) 1.5 time operating pressure
61. Steel tubing identify by.
A) factory and manufacture trade name
B) SAE Number
C) Containing toxic material
D) All
Answer
D) All
62. Chromium vanadium made for.
A) 18% Cr
B) 1% Cr
C) 18% vanadium and 1% Cr
Answer
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.
Answer
A) intentional difference in dimension of mating part or minimum clearance that can be allowed between mating parts.
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
A) difference in size between mating parts where outside dimension is smaller than inside dimension.
65. Disadvantage of cable link.
A) not flexible
B) frequent adjustment of cable
C) high weight
Answer
B) frequent adjustment of cable
66. Melting point of steel.
A) 2600 F
B) 1100 F
C) 1300–1600 F
Answer
A) 2600 F
67. How many require gear in compound train.
A) 1
B) 2
C) 3
D) 4
Answer
D) 4
68. Hacksaw blade teeth are.
A) 12 to 14 TPI
B) 14 to 32 TPI
C) 14 to 42 TPI
Answer
B) 14 to 32 TPI
69. Factors affecting corrosion.
A) Climate
B) Dust oil
C) Foreign material
D) All
Answer
D) All
70. Nitriding.
A) Heat treatment process
B) Case hardening
C) Annealing
Answer
