DGCA PAPER - II JUNE 2013
All Correct answers are given at the last of this document.
1. All submerged parts & hull of seaplane is sprayed with liquid lanoline upto height of _____________ above water line
(a) 1 Feet (b) 2 Feet (c) 1 meter (d) 2 meter
2. Mark the correct statements
a)Steel wool is used on Al-alloy for corrosion removal
b)Clad-Al can be cleaned by mechanical method
c)Trichloroethylene is used for removal of grease
d)All of the above
3. Evidence of surface corrosion and extent of pitting should be tested by
(a) Hardness testing (b) Impact testing (c) Probing with a fine needle (d) None of these
4. Exhaust of Aero-engine made of stainless formed ________________ due to high temperature
(a) Crevice corrosion (b) Electrolytic corrosion (c) Inter-granular corrosion (d) Stress corrosion
5. Which type of corrosion is occurred in mounting bolts of engine and wings ?
(a) Inter-granular corrosion (b) Stress corrosion (c) Concentrating cell corrosion (d) Fettling corrosion
6. Heated section checked with magnet for corrosion detection, basically that indicate their relative
(a) Conductivity of part (b) Permeability of part (c) both (a) and (b) (d) None of these
7. Which is most suitable condition for storage of Aircraft part?
(a) Less than 60% humidity (b) Equal to 60% humidity (c) More than 60% humidity (d) None of these
8. Paint stripper is removed with
(a) Steel wool (b) Emery cloth (c) Aluminium wool (d) Non-metallic material
9. Which type of stripper is used on plastic or windows parts?
(a) Water-miscible paint remover (b) Solvent-miscible paint remover
(c) Both (a) & (b)
(d) None of these
10. Anodic film can be removed by a solution of
a) 10% Sulphuric acid + 4% Potassium fluoride b) 20% Sulphuric acid + 10% Potassium fluoride c) 20% Sulphuric acid + 20% Potassium fluoride d) All of the above
11. Chromate film treatment is carried on __________ material
(a) Al-alloy (b) Mg-alloy (c) Steel-Alloy (d) Titanium
12. Cadmium plating can be removed by
(a) Mechanical cleaning (b) Chemical cleaning
(c) Both (a) & (b)
(d) None of these
13. Mark the correct statement regarding chemical cleaning of steel
a) Corrosion on steel can be removed by pickling solution
b) Phosphoric acid can also be used
c) As in (b), it dissolved oxide film and partly inhibit the steel surface
d) All of the above
14. Mark the correct statement regarding chemical cleaning of Al-alloys
a) Light corrosion can be removed by solvent b) Heavy deposits on clad Al-alloy can be removed chemically c) Heavy deposits on non-clad Al-alloy can be removed mechanically d) All of the above
15. Which of the following corrosion remover required a followed-up action of chromate bearing conversion coating treatment?
(a) Chromic-acid corrosion remover
(b) Phosphoric-acid corrosion remover
(c) Butyl alcohol + Isopropyl alcohol + water
(d) Nitric acid + water
Which acid is used for cleaning of Mg-alloy?
(a) Chromic acid (b) Phosphoric acid (c) Nitric acid (d) Sulphuric acid
16. Steel and Non-clad Al-alloy can be cleaned by
(a) Wet glass paper (b) Dry emery paper (c) Dry sand paper
(d) As in (a) & water acts as lubricants
17. Which type of scraper is used for corrosion removal on casting or forging parts?
(a) Steel carbide tipped (b) Plastic copped tip scraper (c) Abrasive tipped cap scraper (d) None of these
18. Mark the correct statement regarding battery component
a)Lead-acid battery compartment neutralized by bi-carbonate of soda
b) Ni-Cd battery compartment neutralized by acetic acid
c) The sump vent jar containing moist absorbent pad with neutralizing agent
d) All of these
19. Human wastes corrode the lavatory area, because it is ________ in nature
(a) Acidic (b) Caustic (c) Neutralizing agent (d) None of these
20. Grip length of the bolt is
(a) Total length of the bolt (b) Plain sank portion of the bolt (c) Length under the head of the bolt to the end of the bolt (d) None of these
21. In close tolerance bolt, force applied to drive in is
(a) 10 ounce hammer (b) 20 ounce hammer (c) 12 to 14 ounce hammer (d) Sledge hammer
22. AN 4-7 bolt shows
(a) 7/8” dia (b) ¼” length (c) 4”length (d) ¼”dia
23. Bolt of class 4 fit is
(a) Loose fit (b) Free fit (c) Close fit (d) Tight fit
24. Special washer AC 950 and AC 955 are used where
(a) Bolt is installed at angle to surface (b) Bolt is installed head down (c) It can be used any where (d) None of these
25. To prevent the crushing surface on wooden structure with nut and bolt, the washer used is
(a) AN 936 (b) AN 935 (c) AN 970 (d) AN 960
26. Where shear load is taken by the bolt, the nut used is
(a) Plain nut (b) Castle nut (c) Castellated shear nut (d) Self locking nut
27. In the patch repair of the Aircraft skin, the edge distance (distance from the centre of the rivet to the edge of the sheet) should be (d is diameter of rivet)
(a) 2d to 4d (b) 8d (c) 6d (d) 75% of the pitch
28. Pitch of the rivet should be
(a) 1½ d (b) 6d to 8d (c) 1½ x d (d) All of these
29. The amount of the length required to form the head of the rivet is
(a) 2 d (b) 4 d (c) 1½ x d (d) 8 d
30. Chamfering of the patch plate is done at the angle of
(a) 25 ° (b) 45 ° (c) 60 ° (d) 15 °
31. In patch repair, clearance between the rivet and hole should be
(a) 0.008” (b) 0.5” (c) 0.002” to 0.004” (d) 0.4”
32. A rivet with part no. AN 470 AD 3-5 is having a diameter of
(a) 3/32” (b) 5/32” (c) 3/16” (d) 5/16”
33. Seam welding is
(a) Pressure welding (b) Non-pressure welding
(c) Electric resistance (d) Both (a) & (c)
34. In which type of welding, the electrode is non-consumable
(a) TIG (b) MIG (c) Electric resistance (d) Oxyacetylene
35. Spot welding electrodes should be
(a) Good conductor of Electricity (b) Good conductor of heat (c) High strength & Hardness (d) Both (a) & (c)
36. In leftward welding
(a) Filler rod precedes torch (b) Torch precedes filler rod (c) A 60° V is prepared at the end of plate (d) Both (a) & (c)
37. The color of acetylene cylinder and oxygen cylinder is
(a) Maroon & Black (b) Black & Maroon (c) Yellow & Black (d) Black & Yellow
38. Bi-Planer block in Chain assembly is used for changing the plane of articulation through
(a) 120 ° (b) 90° (c) 180° (d) None
39. For Non-reversible chains, mark the correct statement
(e) Every third inner plate is extended in one direction
(f) Every second outer plate is extended in one direction
(g) Every fourth outer plate is extended in both direction
(h) All are wrong
40. If supply voltage = 30V, then working voltage of capacitor could be
a) 90V b) 45V c) 50V d) 55V
41. The useful load of an aircraft is
a) Difference between maximum gross weight and empty weight
b) Difference between maximum net weight and total weight
c) Sum of empty weight and gross weight
d) Weight of fuel
42. MTCS
a) CD-plated rivet should not be used in areas where temperature of 250o or more are likely to be encountered
b) If the thickness of the sheet is less, then half the diameter of the rivet is used
c) Failure of joint will depend on the bearing stress rather than shear stress in the rivet.
d) All of the above
43. Rivets are designed
a) Stronger in shear b) Stronger in tension c) Should not be subjected to excessive tension load
d) Both a) and c)
44. Zero fuel weight means
a) AUW menus weight of fuel
b) Weight of cargo, passenger and crew
c) Maximum allowable weight of loaded aircraft without fuel and statement b)
d) All of the above
45. I-beam is produced by
a) Rolling b) Casting c) Forging d) None
46. Caustic cleaning products used on Al-structure have the effect of producing
a) Passive oxidation b) Improved corrosion resistance c) Corrosion d) None
47. Fayed surface cause concern in chemical cleaning because of the danger of
a) Forming passive oxide b) Entrapping corrosive material c) Corrosion by embedded iron oxide d) All of the above
48. The rust or corrosion that occurs with most of the metal is the result of
a) A tendency for them to return their natural state
b) Blocking the flow of electrons in homogenous metals or between dissimilar metal
c) Electron flow in or between metal for cathode to anode area
d) All of the above
49. Which of the listed condition is not one of the requirements for corrosion to occur
a) Presence of electrolyte b) Electrical contact between an anodic area and a cathodic area c) Presence of passive oxide film
d) None of these
50. Inter-granular corrosion on Al-alloy part
a) May be detected by surface pitting, white powdery deposit b) Appears as thread like filament c) Cannot always be detected by surface indication d) All of the above
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51. When QNH is set on milibar scale, the altimeter reads
a) Altitude above mean sea level b) Height above the airport elevation
c) Both A and B d) None of the above
52. When QFE is set on milibar scale, altimeter reads
a) Altitude above mean sea level b) Height above the airport elevation c) Both A and B d) None of the above
53. Pitot head is mounted parallel to the
a) Latitudinal axis of aircraft b) Longitudinal axis of aircraft c) Both A and B
d) None of the above
54. All the altimeter
a) Are constructed on the principle of Aneroid barometer b) They have pressure responsive elements c) Aneroid mechanism d) All of the above
55. Hysterisis error in altimeter
a) Is induced by aircraft maintaining a given altitude for certain period of time and suddenly making a large altitude change
b) This error will eliminate itself with slow climbs and descends
c) After maintaining a new altitude for a reasonable period of time d) All of the above
56 Installation errors in altimeter mechanism is
a) Caused by change of alignment of static pressure port with the relation wind
b) Speed of aircraft and angle of attack of aircraft
c) By location of the static port in a disturbed pressure field
d) All of the above
57 An ROCI is connected to
a) Static pressure only b) Pitot pressure only c) Both A and B d) None of the above
58 In ROCI during dive of aircraft, the diaphragm
a) Contracts b) Expands c) Both a & b d) No effect
59 Any sudden or abrupt change in the aircraft altitude may cause erroneous indications of ROCI
a) Due to a sudden change of airflow over static port b) Sudden change of air flow over pitot head c) On both A and B
d) None of the above
60 An instantaneous ROCI is
a) Recent development b) Incorporates acceleration pumps c) Eliminates limitations associated with calibrated leak assembly d) All of the above
61. Which type of pipe wrench is designed with adjustable serrated jaws for gripping round pipes?
a) Warnok type b) Stillson type c) Super wrench tool d) Williams type
62. Vise grip pliers is also known as
a) Heavy pliers b) Lever jaw wrench c) Monkey pliers d) None
63. Punch holders are used to hold
a) Punches b) Chisels c) Both ‘a’ & ‘b’ are correct d) As in ‘a’, when a hard blow is required
64. Which pliers can be used for completing the safety wire operation?
a) Safety wire pliers b) Diagonals & duck bill pliers c) Both ‘a’ & ’b’ are correct d) As in ‘a’ & diagonals
65. Diagonals are used for
a) Cutting steel wires & rods b) Cutting bolt heads c) Both ‘a’ & ‘b’ are correct d) None
66. The shape of long nose pliers is
a) Round b) Half- round c) Square d) None
67. The jaws of vise grip pliers is released from locking by
a) A small lever at each handle b) A compound lever at both handles c) A small lever at one of the handles d) None
68. What action locks the jaws of a vise grip pliers?
a) Compound leverage action b) Lever action c) Toggle action d) None
69. Which thread is used where a great strength is required in one direction?
a) Acme b) Square c) Worm d) Buttress
70. In interlocking- joint pliers,
a) There are a number of holes at the hinge point b) There are two holes at the hinge point c) There are several curved grooves at the hinge point d) None
ANSWERS ................
1B 2C 3C 4C
5D 6B 7A 8D
9C 10A 11B 12C
13D 14D 15B 16A
17D 18A 19D 20A
21C 22A 23D 24C
25B 26C 27A 28A
29C 30C 31C 32A
33D 34D 35A 36D
37A 38A 39
40. b 41. a 42. d 43. d 44. c 45. a 46. c 47. b 48. a 49. c
50. c 51. a 52. b 53. b 54. d 55. d 56. d 57. a 58. b 59. a 60. d 61. b 62. b 63. c 64. c 65. d 66. b 67. c 68. c 69. d 70. c
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