a. To increase mechanical strength and tackiness
b. To reduce mechanical strength and tackiness
c. To increase the mechanical strength and reduce tackiness
d. To reduce the mechanical strength and increase tackiness
2. Which type of Synthetic rubber will be the first choice for manufacturing of aircraft tubeless tyre
a. Butyl rubber b. Neoprene rubber c. BUNA-N d. thiokol
3. Which synthetic rubber is chiefly used in aircraft hot air duct as sealing ring and wire insulation
a. Silicon rubber b. Polymethane rubber c. BUNA-S d. BUNA-N
4. „ Highest resistance to deterioration but lowest physical property‟ – is the characteristic of which kind of synthetic rubber.
a. GR – I b. GR – S c. GR – P d. GR – A
5. To valcanise thiokol rubber, which element to be added
a. Sulfur b. Sulfur oxide c. Zinc d. Zinc oxide
6. Which material is used for manufacturing of hydraulic booster piston seal
a. Styrene butadiene seal b. Nitrile rubber
c. Flexon rubber d. Fluoro carbon rubber
7. Natural rubber attains fibrous structure when
a. It under goes at low temperature b. It is frozen
c. It is heated to 1300C d. It undergoes continues stress at normal temperature
8. The grade of Kevlar fiber is used for aircraft structure
a. Kevlar – 49 b. Kevlar – 149 c. Kevlar – 29 d. Kevlar – 129
9. The composition for E – glass is
a. Magnesia-alumina-silicate glass b. Lime-alumina borosilicate glass
c. Soda borosilicate glass d. None of the above
10. Truly outstanding properties of strength competes with stronger steel is kind of fiber
a. S – glass b. Hollow fibre glass c. A – glass d. Carbon – glass
11. Which composit material is difficult to cut or drill
a. Glass fibre b. Aramid c. Carbon / Graphite d. None of above
12. Mark the wrong statement for carbon / graphite fibre
a. Is used to fabricate primary structure b. It has high strength and high rigidity
c. It takes compressive load d. It is ductile in nature
13. Corrosion control techniques are employed when corbon fibre is in contact to aluminium
a. A layer of fiber glass is used as a barrie
b. Aluminium is anodized, primed and painted prior to assembly
c. Both (a) and (b) will be applied together
d. None of the above
14. Which composite material is useful for making aircraft parts that are subject to high stress and vibration
a. Fibergalss b. Aramid c. Carbon / Graphite d. None of these
15. Mark the correct statement
a. Carbon fiber are electrically non conductive
b. Carbon fibers have high thermal expansion
c. Carbon fibers have high fatigue resistance
16. Boron fibers are made by sintering the boron elements on a thin film of material
a. Titanium b. Tin c. Tungsten d. All above
17. Which fiber material bears all tension, compression and bending stresses
a. Ceramic fiber b. Boron fiber c. Fiber glass d. Graphite fiber
18. Mark the correct statement in Fiber Orientation
a. Warp direction is designated at 900
b. Weft is designated at 00
c. Bias is at 450 angle of fill threads
d. None of the above
19. For repairing of fabric, which weave to be used
a. Plain weave b. Basket weave c. Satin weave d. All of these
20. Find out the wrong answer: Hybrids of composite material used in Aviation field are
a. Kevlar with carbon / graphite b. Kevlar with fiber glass
c. Carbon / graphite with fiber glass d. None of these
21. In fiber science, which acts as a curing agent
a. Resin b. Matrix c. Catalyst d. All of these
22. Plexiglass is
a. Thermoplastic b. Thermoset c. Laminated d. None of these
23. Mark the correct answer:
Apart from strongest adhesive characteristics of epoxy resin, it has other advantages
a. Useful at very high temperature b. It withstand bending stress
c. Reasonable rigidity and flexibility d. All of these
24. Mark the correct answer:
The advantages of fillers to add to resins are
a. To control viscosity and weight b. To increase pot life and strength
c. Both (a) and (b) d. None of these
25. Nomex is a
a. Filler material b. Matrix c. Reinforced fiber d. Core material
26. Tapered roller bearing support
a. Radial load b. Thrust load c. Both (a) and (b)
27. Bearing used on high powered aircraft engine is
a. Ball bearing b. Roller bearing c. Plain bearing d. Both (a) and (c)
28. Plain bearings are used for
a. Connecting rods b. Crank shaft c. Cam shaft d. All of these
29. Bearings are used to take
a. Thrust load b. Radial load c. Side load d. Both (a) and (b)
30. Bearing used where high compressive pressure, is generally made of
a. Babitt b. Bronze c. Siliver bronze d. All of these
31. Bearing which offer more friction is made of
a. Bronze b. Babitt c. Silicon d. None of these
32. The amount of electricity a capacitor can store is directly proportional to
a. Distance between the plate and inversely proportional to the plate area
b. Plate area and is not affected by the distance between the plate.
c. Plate area and inversely proportional to the distance between the plate
d. None of these
33. The correct way to connect a test volt meter in a circuit is
a. In series with a unit b. Between the source voltage and the load
c. In parallel with unit d. Both (a) and (c) are correct
34. Typical application of Zener diode is as
a. Full wave rectifiers b. Half wave rectifier
c. Voltage regulator d. Amplifier
35. The method used to rapidly charge a Nickel Cadmium battery utilizes
a. Constant current and constant voltage b. constant current and varying voltage
c. Constant voltage and varying current
d. Varying voltage and varying current
36. What tasks are completed prior to weighing an aircraft to determine its empty weight
a. Remove all items except those on aircraft equipment list, drain fuel and hydraulic fluids
b. Remove all items on the aircraft equipment list, drain fuel, compute oil and hydraulic fluid weight
c. Remove all items except those on the aircraft equipment list, drain fuel and fill hydraulic reservoir
d. All of these
37. Useful load of an aircraft is the
a. Difference between the maximum gross weight and empty weight
b. Difference between the net weight and total weight
c. Some of the empty weight and the max. gross weight
d. Weight of the fuel
38. Certain amount of slacks must be left in flexible hose during installation because when under pressure it
a. Expand in length and diameter
b. Expand in length and contracts in diameter
c. Contracts in length and expands in diameter
d. Contracts in length and diameter
39. Excessive stress on fluid or pneumatic metal tubing caused by expansion or contraction due to temperature change can best be avoided by
a. Using short, straight sections of tubing between fixed parts of aircraft
b. Not projecting the aircraft to sudden change in temperature
c. Providing bends in the tubing
d. None of the above
40. Which heat treating process of metal produces a hard, wear resistance surface over strong, tough core
a. Case hardening b. Annealing c. Tempering d. Hardening
41. Which of the following hose materials are compatible with phosphate-ester base hydraulic fluids
a. Butyl b. Buna-N c. Neoprene d. Buna-S
42. In a metal tubing installation
a. Rigid straight line runs are preferable
b. Tension is undesirable because pressurisation will cause is to expand and shift
c. A tube may be pulled in if the nut will start on the threaded coupling
d. None of the above
43. Magnetic particles inspection is used primarily to detect
a. Distortion b. Deep surface flaw
c. Flaws on or near the surface d. Flaws in plastic material
44. Which material cannot be heat treated repeatedly without harmful effects
a. Unclad aluminium alloys in sheet forms
b. 6061- T9 Stainless steel
c. Clad aluminium alloy
d. Carbon steel
45. What is generally used in the construction of aircraft engine fire walls
a. Stainless steel b. Chromium Molybdenum alloy steel
c. Magnesium Titanium alloy steel d. Wrought iron
46. A fiber type self locking nut must never be used on an aircraft if the bolt is
a. Under shear loading b. Under tension loading
c. Subject to rotation d. All of these
47. Aircraft bolts are usually manufactured with a
a. Class-I fit for the thread b. Class-II fit for the thread
c. Class-III fit for the thread d. Class-IV fit for the thread
48. Hose and a few projecting globules are found in a weld. What action should be taken
a. Re-weld the defective portions
b. Remove all the old weld and re-weld the joint
c. Grind the rough surface smooth, inspect and re-weld all gaps / holes
d. Can be used in the same way
49. Which condition indicate a part has cooled too quickly after being welded
a. Cracking adjacent to the weld
b. Discoloration of the base metal
c. Gas pockets and porosity
d. Slag inclusion
50. Which tool is used to measure the clearance between the surface plates and a relatively narrow surface being checked for flatness.
a. Depth gauge b. Thickness gauge c. Dial indicator d. Vernier Caliper
51. Which tool is used to find the center of a shaft or other cylinder work
a. Combination set b. Dial indicator c. Micrometer caliper d. Set square
52. What tool is generally used to calibrate a micrometer or check its accuracy
a. Gauge block b. Dial indicator c. Machinist scale d. None of these
53. When approaching the front of an idling jet engine the hazard area extends forward of the engine approximately
a. 10 feet b. 15 feet c. 25 feet d. 35 feet
54. Which of the following is the most satisfactory extinguishing agent for use on a carburetor or intake fire
a. Dry chemical b. A fine water mist c. Carbon dioxide
d. Form
55. When approaching the rear of an idling turbo jet engine the hazard area extends aft of the engine approximately
a. 200 feet b. 100 feet c. 50 feet d. 25 feet
56. When towing a large aircraft
a. A person should be in the cockpit to watch the obstruction
b. Person should be stationed at the nose
c. Person should be positioned each wing tip and the empennage
d. A person should be in the cockpit to operate brakes
57. A fuel that vaporizes too readily may cause
a. Hard starting b. Detonation c. Vapor lock d. None of these
58. The main difference between grades 100 and 100LL fuel are
a. Volatility and lead content b. Volatility, lead content and colour
c. Lead content and colour d. All of these
59. Tetra ethyl lead is added to aviation gasoline to
a. Retard the formation of corrosive
b. Improve the gasoline performance in the engine
c. Dissolve the moisture in the gasoline
d. None of these
60. If the temperature of a confined liquid is held constant and its pressure is trippled, the volume will
a. Triple
b. Reduced to one third its original volume
c. Remains same
d. Multiply by a fixed factor
Answers:
1 c 2 a 3 a 4 c 5 d
6 b 7 b 8 a 9 b 10 d
11 b 12 d 13 c 14 b 15 c
16 c 17 b 18 d 19 c 20 d
21 c 22 a 23 d 24 c 25 c
26 c 27 b 28 d 29 d 30 b
31 a 32 c 33 c 34 c 35 c
36 c 37 a 38 c 39 c 40 a
41 a 42 b 43 c 44 c 45 a
46 c 47 c 48 b 49 a 50 b
51 a 52 a 53 c 54 c 55 b
56 d 57 c 58 c 59 b 60 b