DGCA Module 06 Material and Hardware Exam, 1st Session of 2017, tested in dgca exam including materials, fasteners, seals, bearings, and corrosion control, essential for ensuring structural integrity and maintenance safety in aviation.
DGCA Module 06
1st Session of 2017
1. Internal wrenching bolt takes load.
A) Compression load
B) Tension load
C) Both tension and shear load
Answer
2. In MS flareless fitting specification, letter ‘d’ indicates which material.
A) Aluminium alloy
B) Steel
C) Copper
Answer
3. In number ‘an3dd5a’, the number 5 indicates.
A) 5/16 inch length of the bolt
B) 5/8 inch length of the bolt
C) 5/16 inch diameter of the bolt
Answer
4. The number an441 indicates which type of rivet head.
A) Round head rivet
B) Flat head rivet
C) Universal head rivet
Answer
5. Fla cordage complying with bs f35 or braided nylon cord (coreless) complying with.
A) Eyeleted fuselage webbing
B) Stringing
C) Tapes
Answer
6. Fatigue limit is.
A) 0.2x ultimate tensile strength
B) 0.5x ultimate tensile strength
C) 0.9x ultimate tensile strength
D) Simultaneously equal to U.T.S.
Answer
7. ‘Drop of beam method’ is used to determine.
A) Hardness
B) Yield point
C) Aluminium
Answer
8. 7000 has the main alloying element.
A) Mg
B) Mg-Si
C) Zinc
Answer
9. Compressor disks, spacer ring, compressor blades & vanes are fabricated from.
A) Chrome vanadium
B) Titanium
C) Nickel steel
Answer
10. Bolts, terminals, keys, clevises & pins are made of.
A) SAE2330
B) SAE1095
C) SAE1050
Answer
11. Tensile strength of beryllium copper is increased by.
A) Increasing the copper
B) Decreasing the copper
C) Heat treatment
D) Cold rolling
Answer
12. Hardest structure of the steel is.
A) Austenite
B) Cementite
C) Martensite
Answer
13. The hardness testing of non-ferrous metal is tested by.
A) By filing
B) To check the material
C) Barcol tester
Answer
14. Titanium is heated for the following purpose.
A) Relief of stresses set up during cold rolling, forming or machining
B) Annealing after hot working & cold working
C) Thermal hardening to improve strength
D) All
Answer
15. Rockwell tester is used for the.
A) Hard materials
B) Soft materials
C) Soft & hard of all shapes
Answer
16. While direct sunlight does not harm acrylic plastic, it will cause drying & hardening of the masking adhesive. To remove the hardened masking paper use.
A) MEK
B) By softening the adhesive
C) By softening the adhesive with aromatic naptha
Answer
17. Which has a low water absorption rate, good resistance, and works in low temperature.
A) Natural rubber
B) Butyl rubber
C) Buna-k
Answer
18. MTCS.
A) Bolts & screws are two types of fastening devices which give required security of attachment & rigidity
B) As in ‘A’ & both used where high strength is required
C) As in ‘A’ + threaded end of the bolt is always blunt while that of a screw may be blunt or pointed
D) As in ‘A’ + bolt is usually fitted in female receptacle
Answer
19. Which is the correct statement.
A) Class 1 fit can easily turn with the finger
B) As in ‘A’ & bolts and screws are used where great strength is required
C) As in ‘B’ + bolt is manufactured in class 4 fit
Answer
20. A triangle marking on head of bolt identifies.
A) AN standard bolt
B) Close tolerance bolt
C) MS bolt
Answer
21. Self locking nuts are.
A) Boots self locking nut
B) Stainless steel self locking nut
C) Elastic stop nut
D) All
Answer
22. A hi-shear fastener is mainly used where.
A) Low strength is required
B) High shear strength and light weight are required
C) Only temporary fastening is needed
Answer
23. Clad aluminium sheets are used in aircraft structure to improve.
A) Magnetic properties
B) Corrosion resistance
C) Electrical insulation
Answer
24. The grip length of a bolt should be equal to.
A) Thickness of the material being fastened
B) Diameter of the bolt head
C) Total thread length
Answer
25. Which material is generally used for aircraft control cables.
A) Mild steel
B) Corrosion-resistant steel
C) Brass
Answer
26. The purpose of a turnbuckle in a control cable system is to.
A) Reduce vibration
B) Adjust cable tension
C) Increase cable diameter
Answer
27. A cherrymax rivet is identified by.
A) Plastic head
B) Self-locking stem
C) Square shank
Answer
28. Titanium becomes difficult to machine because of its.
A) Low strength
B) Poor heat conductivity
C) Soft surface
Answer
29. A plain washer is primarily used to.
A) Lock the nut in place
B) Distribute the load over a larger area
C) Increase thread friction
Answer
30. Elastic stop nut may be used or re-used.
A) If nut can be turned with finger
B) Nut should be free from burrs around holes and collars
C) Fibre collar is slightly brittle
Answer
31. Which washer is used in places subjected to vibration.
A) Special washer
B) Shakeproof washer
C) Lock washer
Answer
32. A fastener which has no clearly defined grip length.
A) Rivet
B) Screw
C) Bolt
Answer
33. A corroding action will take place if in contact with each other in presence of moisture.
A) 1100 and 3003
B) 2017 and 2124
C) 5052 and 2124
Answer
34. A corroding action will take place in contact with each other in presence of moisture.
A) 7075 and 2117
B) 6053 and 5052
C) 2117 and 2124
D) 6053 and 7075
Answer
35. MTCS.
A) Riveted coated with zinc chromate is yellow
B) Metal spray is silver gray
C) Anodized has pearl gray
D) All
Answer
36. The most common aircraft cable is.
A) 7×7 and 7×79
B) 7×1 and 7×18
C) 7×19 and 7×18
D) 7×18 and 7×14
Answer
37. Disadvantage of cable linkage is.
A) Not flexible
B) Frequent adjustment of cable
C) High weight
Answer
38. MTCS.
A) Taper pins are used to carry shear load
B) Flat head pin is used with rod terminals & secondary control
C) Roll pin is tubular shape & seated in the full length of tube
D) All
Answer
39. Which determines the selection of wire in the electrical system.
A) Voltage drop
B) Current carrying capacity
C) Both
Answer
40. To avoid magnetic interference around wire, which is used.
A) Shielded wire
B) Standard aircraft wire
C) None
Answer
41. MTCS about control cable.
A) 3/32 inch – copper brass
B) 1/16 inch – copper brass
C) 3/32 inch – stainless steel
Answer
42. Galvanic action takes place in.
A) Intergranular corrosion
B) Surface corrosion
C) Dissimilar metal corrosion
Answer
43. The attack penetrates into the core of the material along the boundaries of the metal grain.
A) Pitting
B) Intergranular corrosion
C) Stress corrosion
Answer
44. The part of the surface of thread which connects adjacent flanks at the top of the ridge.
A) Root
B) Lead
C) Crest
Answer
45. Scratches, abrasion or minor corrosion on the outside of the fluid lines may be considered negligible & can be smoothened with.
A) Aluminium wool or burnishing tool
B) Brushing tool or emery paper
C) Aluminium wool or hand burnishing
Answer
46. Rigid fluid lines used for fittings are.
A) Flare, flareless, swaged
B) Flare or flareless
C) Bead & clamp or flareless
Answer
47. In which gear teeth are cut so they radiate from the apex of a cone & lie on the conical surface.
A) Bevel gear
B) Spur gear
C) Helical gear
Answer
48. Which gear transfers the motion between two shafts which intersect each other at an angle.
A) Spur gear
B) Bevel gear
C) Helical gear
Answer
49. MTCA.
A) Large gear is called gear and smaller gear is called pinion
B) As in ‘A’ + large gear will always be driver and small gear will always be driven
C) As in ‘A’ + either large gear or small gear may be driver or driven
Answer
50. In a simple gear train.
A) At least two or more gears rotate on different shafts
B) As in ‘A’ + even number of gears rotate in same direction
C) As in ‘B’ + odd number of gears rotate in opposite direction
D) As in ‘A’ + even number of gears rotate in opposite direction
Answer
51. MTCS (Wire gauge color code).
A) 10 gauge – blue
B) 15 gauge – red
C) 11 gauge – yellow
D) All
Answer
52. Forms of corrosion which occur in airframe structure.
A) Surface and filiform
B) Stress corrosion and intergranular
C) Dissimilar metal corrosion & intergranular
D) All
Answer
53. Type of damage & defect in composite.
A) Crack
B) As in ‘A’ and cosmetic
C) As in ‘B’ and impact
D) As in ‘C’ and holes
Answer
54. Taper ratio of the wood grain.
A) 8:1
B) 10:1
C) 12:1
D) 14:1
Answer
55. Spring which has excellent resistance to corrosion.
A) Stainless steel
B) Chrome vanadium steel
C) (No option listed)
Answer
56. In ultrasonic testing of composite.
A) Use high frequency waves
B) As in ‘A’ and the waves pass through the composite structure
C) As in ‘B’ and record the time for returning waves
Answer
57. Size, diameter & material of spring is selected for.
A) Load carrying capacity
B) Corrosion resistance
Answer
58. Rigid tubings of fluid lines.
A) Mostly made of stainless steel
B) Made of 5052-O aluminium alloy
C) As in ‘B’ and made of stainless steel in case of high pressure application
Answer
59. MTCS in addition to repair of composite material.
A) Bolted the material
B) As in ‘A’ and a new ply lamination to the surface
C) As in ‘B’
D) As in ‘C’
Answer
60. The function of a cotter pin in aircraft assembly is to.
A) Provide torque to the bolt
B) Lock a castellated nut in place
C) Reduce vibration
D) Prevent thread stripping
Answer
61. Which material is most commonly used for aircraft structural tubing.
A) Copper
B) Stainless steel
C) 2024-T3 aluminium alloy
D) Magnesium alloy
Answer
62. Anodizing of aluminium alloy provides.
A) Increased strength
B) Corrosion resistance
C) Thermal insulation
D) Electrical conductivity
Answer
63. A shear pin is designed to.
A) Provide rotational motion
B) Break under specific load conditions
C) Withstand tensile loads only
D) Increase fatigue life
Answer
64. Which metal is most prone to galvanic corrosion when in contact with stainless steel in moist environment.
A) Titanium
B) Aluminium
C) Brass
D) Bronze
Answer
65. Safety wire is used in aircraft maintenance to.
A) Strengthen rivets
B) Secure fasteners from loosening
C) Increase flexibility
D) Measure wire tension
Answer
66. When torqueing a bolt, the most important factor is.
A) The color of the bolt
B) Length of the bolt
C) Torque value specified by the manufacturer
D) Material type
Answer
67. Which type of composite damage is invisible to the naked eye but affects internal layers.
A) Cosmetic damage
B) Surface scratch
C) Delamination
D) Pitting
Answer
68. A corrosion-resistant alloy used extensively in jet engine components is.
A) Duralumin
B) Incoloy
C) Copper
D) Brass
Answer
69. The thread pitch of a screw refers to.
A) The number of flutes
B) The distance between adjacent threads
C) The depth of the head
D) The diameter of the screw
Answer
70. A bushing in an aircraft assembly is used to.
A) Replace a bolt
B) Reduce wear between moving parts
C) Conduct electricity
D) Hold rivets in place
Answer
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