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DGCA PAPER-2 JUNE 2011
1. If the input of half wave rectifier is 240 V and transformer has a step down ratio of 8:1, what is the output peak value?
Ans: 42.2 V
2. Yellow color stands for
Ans: Lubrication
3. Corrosion along grain boundaries is called
Ans: Intergranular corrosion
4. We can get vastly superior product than iron If carbon is added to iron, in percentages ranging up to
Ans: approximately 1 percent.
5. A metal which can be hammered, rolled, or pressed into various shapes without cracking, breaking, or leaving some other detrimental effect, is said to be
Ans: Malleable
6.While selecting a capacitor check for
Ans: How much voltage it can withstand
7.Illustrated parts catalog shows which drawing
Ans: Exploded view diagram
8.Which of them is a 5 layer device
Ans: Triac
9. Convert octal code 3574 to binary
Ans: 011 101 111 100
10.Demultiplexer is
Ans: o/p is same as i/p of multiplexer
11.Metal tubings are sized by
Ans: Outside diameter in increment of 1/16 inch
12.Stringers, bulkhead, skin, rivet and extruded section are made from
Ans: Wrought aluminum alloy
13.Two input bubbled AND gate is
Ans: NOR gate
14.If the peak value is 100 volts then at an angle of 30° what is the instantaneous value
Ans: 50 V
15.Wrenches are made of
Ans: Chrome vanadium steel
16.medium threads is
Ans: class 3
17.which bolt is used only in shear never in tension
Ans: Clevis
18.EICAS
Ans: Engine indicating and crew alerting system
19 . RMS value in half wave is 10 amp, what will be the rms value if it is full wave rectified
Ans: 14.14 amp
20. Kirchof current law applicable only for
Ans: Junction network
21. 8085 microprocessor operand depends on data adressing
Ans: Direct register
22.In star connection
Ans: IL=IP
23.General purpose solders
Ans: Tin, lead and antimony
24. ATA chapter -21
Ans: Air Conditioning
25. What happen when LA battery temp increases?
Ans: internal resistance reduces
26. when current flown b/w two conductor in same direction
Ans: Field strength decreases and it attract each other
27.In four stroke engine spark plug fires in
Ans: 2 revolutions of crank shaft
28.Frequencies used in ultrasonic are in the frequency range of
Ans: 500 KHz to 10 MHz
29. Electro static is dangerous if above
Ans: 1000 V
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30. In the circuit shown in the figure, calculate the value of value of unknown resistor R when the current in branch OC is zero.
Ans: 6 V
31. 240 on capacitor indicates
Ans: 240 picof
32. cable of medium flexibility and is used for trim tab controls, engine controls, and indicator controls is
Ans:7 X 7
33. SCR consists of
Ans: 3 terminals and middle one is forward biased
34. Convert C5F2 to binary
Ans: 1100 0101 1111 0010
35. Current in inductor
Ans: Lags voltage by ?/2
36. Which is an excellent material to use with phosphate ester base hydraulic fluid.
Ans: Butyl
37. 33xx indicates in wrought aluminum indicates
Ans: Manganese
38. Soft brazing temperature is
Ans: 600°c to 850°c
39. Files used for filing internal angles, clearing out corners, and filing taps and cutters
Ans: Triangular and three square
40. Leveling of aircraft is carried out by
Ans: Placing a plumb bob
41. If rf and af is present, it can be filtered using
Ans: LPF&HPF
42. Highest tensile strength is of which composite
Ans: Aramid
43. In transistor when both junctions are reversed biased it is in a state of
Ans: Cut off & Vce=Vcc
44. Mark correct statement regarding control cable
Ans: Cable linkage has the disadvantage that tension must be adjusted frequently due to stretching and temperature changes.
45. In five numeral designation of alloy steels according to sae the 1st 2 digits indicates
Ans: Type of steel
46. accuracy of micrometer can be checked by
Ans: gauge block
47. In correct sequence – 5 events of a piston engines
Ans: Intake, compression, ignition, power, exhausts
48.Temperature at stratosphere becomes constant at
Ans: -57*F
49.Camber shape increases when deflecting the flap
Ans: fowler flap
50.If test indicates that the metal is non magnetic
Ans: Monel
51.Magnesium alloys are treated to improve UTS,ductility,shock resistance by
Ans: solution heat treatment
52.The rivet used for riveting Mg alloy structures
Ans: 5056
53.One lug anchor nut
Ans: Identify the diagram
54.MTCS regarding turnbuckle
Ans: Brass barrel with both left hand &right hand threads
55.Radiographic inspection depends on
Ans: Thickness,density,size of the object
56.
Ans: Extension bar
57.MTCS regarding micrometer
Ans: Barrel and anvil are fixed parts and thimble is moving part
58.Wattmeter errors are caused by
Ans: NOTA
59.Roller bearings(could not paste image) are used for
Ans: Radial loads only
60.Pitch diameter of a spur gear
Ans: Addendum x No.of teeth
61.Triangle inside the circular ring of a bolt indicates
Ans: Close tolerance bolt
62.Al sheet with 2mm thickness can be welded by
Ans: Oxy-acetylene welding
63.Basic computer where data can be stored but can not be transformed?
64.Conversion of galvanometer into voltmeter is by
Ans: connecting a high resistance in parallel with the component
65.An aerodyne which not uses propeller power and flights by aerodynamic reactions
Ans: Glider
66.The voltage gain of a CE configuration increases
Ans: By decrease in load resistance
67. Al is doped with fabric
Ans: Used to protect against UV ray’s from sunlight
68.If two conductors placed parallel and current flowing in same direction hungs
Ans: Attract each other
69.MTCS regarding Drilling
Ans: Make a centre punch, drill on centre punch etc
70.A gear rack is used to
Ans: Transform reciprocating into rotary motion
71.Hydraulic colour is indicated by
Ans: Yellow bluish colour
72.V-I characteristics (could not show diagram)
Ans: Diode
73.Find resistance and current in the ckt(could not show diagram)
Ans: 12ohm and 5 ampere
74.Combination of two or more reinforced fibres
Ans: Hybrid composite
75.If electrolyte from a Pb-acid battery is spilled in battery compartment
Ans: Use Na2Co3 solution
76.CB’s(could not show diagram)
Ans: Automatic,push reset,push reset pull off
77.Piezo electric effect causes vibration
Ans: voltage is induced when pressure applied and frequency depends on thickness
78.The stress which is developed when two sheets are riveted together
Ans: Shear stress
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