Set-12 , dated 5/10/2015

1. In an A.c. circuit, inductance causes current to:a) Logs the voltageb) Lead the voltagec) 180 out of phased) phase with voltage

2. A wire of resistance 4 stretches to twice its original length, resistance is:a) 8b) 4c) 2d) 16

3. 7 resister connected to 20 each in parallel voltage 2v ammeter connected across the circuit measure:a) 7/10 ampb) 1/10 ampc) 2/10 ampd) 20/10 amp

4. Speed of light energy in 3 lakhs k.m & frequency is 100 Mhz, its wave length is:a) 3 meters or 9.27 ft.b) 2.5 meters or 8 ftc) 2 meters or 7ft

5. Convert 296 into binarya) 100101000b) 110010100c) 010101010d) 101110000

6. To prevent corrosion Al. alloy sheets how they are stored:a) Only the coat of linced/oil is sufficientb) Use of plastic cover without oil coatingc) Use of oil coating in addition to plastic cover

7. What causes-de-lamination of composite layer:a) In adequate application of heat on pressure during processb) Improper resin/catalystc) Inadequate amount of pressure or heat during the cure cycled) All

8. How the composites are electrical bonding:a) Al. metal is bonded to the composite to the adjacent metal to dissipate chargesb) Fine Al. screen may be laminated under the top layerc) Al . may be flame sparayedd) All

9. The triode grid purpose is:a) Reduce space chargeb) Is also known as control gridc) As in a & also known as screen gridd) Both a & b

10. Zener diode acts as a voltage regulator:a) To control the over voltage in transistorize voltage regulatorb) Some times called as breakdown diodesc) Both a & b

11. When PN junction start conducting:a) When the plate is more +ve than the cathodeb) When the cathode is more +ve than platec) When the cathode & plate is at same potential

12. P-N junction can not used as:a) Rectifierb) Amplifierc) Transistor

13. The I.R of a battery:a) OCV-CCV/Ib) CCV-OCV/Ic) None

14. MTCS in cause of bearing:a) Taper roller bearing take simultaneously radial & axial load in one directionb) Ball roller bearing take simultaneously radial & axial load in one directionc) Deep groove roller bearing take simultaneously radial & axial load in one direction

15. MUNTZ metal is:a) It is brass & made for manufacturing or bolts & nuts and excellent resistant to saline waterb) Muntz metal is a brass composed of 60 percent copperand 40 percent zincc) Both

16. Speed of computer is calculated by:a) Nano second 10-9b) Micro secondsc) Pico seconds

17. Brinelling is:a) Indentation framed during a brinell hardness testb) Damage caused by fretting or corrosionc) Defects in plastic

18. Elastomer in bearing is:a) Layers of rubber impregnated in layers of metalb) Used in helicopters rotor assemblyc) Used in oscillatory loadsd) All

19. Algorithm:a) Has infinite (finite) inputs but definite o/pb) is a sequence of unambiguous instructionsc) Both

20. Computer can process at a time:a) One instructionb) Two instructionc) Several instructions

21. In case of hydraulic seals colour indicates:a) Green colour for skydrol fluidb) Green color for mineral base fluidc) Green color for vegetable base fluid

22. To thickness of electroplating is checked:a) By eddy current methodb) By BFD testc) By measuring with caliper

23. Magnetic particle inspection circular magnetization show:a) Lateral crackb) Longitudinal crackc) 45 crackd) both (b) & (c)

24. The magnetic field around current currying conductor is:a) Concentric circle of magnetic field around conductorb) Is colockwise in directionc) Is anticlockwise in directiond) All

25. In dye penetrate process developers function is:a) React with penetrate to show cracksb) As the developer dries, bright redindications will appear where there are surfacedefectsc) As the developer dries, bright white indications will appear where there are surfacedefectsd) Both a & b

26. In dye penetrate process how the parts are cleaned before process:a) Petroleum base processb) Kerosenec) Water & volatile solvent

27. In modern a/c & jet a/c titanium is used for:a) High strength to weight ratio, heat resistance corrosion resistance, very high ftigue resistanceb) Low strength to weight ratio, heat resistance corrosion resistance, very hard ftigue resistancec) Low strength to weight ratio, less heat resistance corrosion resistance, very hard ftigue resistance

28. How the fatigue failure is indicted:a) 45 to the crack propagationb) May be found on gears and coupling teethc) Both

29. Millibars is the units of borometric Pre. Then standard pressure is shown by:a) 14.7 inches of mercuryb) 1 barc) Both

30. Theory of wt. & balance, the distance between fulcrum & the object is:a) Lever armb) C.G armc) Datum

31. Which material the magnetic lines of force can pass very easily:a) Soft ironb) Alc) Cu

32. For drilling holes in flexi glass:a) Standard twist drills are usedb)

33. To prevent corrosion interior should be cleared by:a) Vacuum pressure

34. Grey colour corrosion product is form in:a) Al. or Mg. alloyb) Copper alloyc) Steel alloy

35. Fully charged lead acid battery have:a) 30% acid & 70% water by volumeb) 30% acid & 70% water by weightc) 70% acid & 30% water by volume

36. For demagnetization:a) Ac decreasing current is used gradually zerob) subjecting the part to a magnetizing force that is continually reversing in direction and, at the same time, gradually decreasing in strengthc) Both

37. Range of ammeter can be increased by:a) Shunt resistanceb) Series resistancec) Multiplierd) None

38. Pure semiconductor diode at 0C has:a) Resistance decrease with temperature increasesb) Resistance increase with temperature increasesc) Infinite resistance at 0C

39. Machine screw should never used in:a) Stressed areab) These screws are used as cap screws where great strength is requiredc) All

40. To locate the sub surface defect:a) Eddy current & X-ray is usedb) MPIc) All

41. Which metal render steel brittle at rolling or forging temperature:a) Sulphurb) Manganesec) Phosporous

42. The drawing in which objects are shown as top view, front view, bottom view:a) Orthographic drawingb) Isometricc) Obliqued) sectoional

43. In isometric drawing lines are drawn:a) Vertical lines are drawn vertical & horizontal line parallel to center lineb) This provides the observer with a three-dimensional view of the objectc) lines in an isometric drawing are parallel and dimensioned as they are in an orthographic projection.

44. Fuselage station is:a) The distance to a given point is measured in inches parallel to center line extending through the a/c from the noise through the center of the tail coneb) Fuselage station 185 indicates a location that is 185 inches from the datum of the aircraftc) Fuselage station 185 indicates a location that is 185 inches from the nose of the aircraftd) Both a & b

45. MTCS in (Light emitting diode):a) It emits more light with increase in temperatureb) The crystal emits lights with increase in temperaturec) Light remains constant with increase in temperature

46. Which view is used to show the location of object as an angle to the plane:a) Sectional viewb) Plan viewc) Elevation viewd) Auxiliary view

47. 100 LL, AVGAS:a) Low lead with dye3d blue colourb) Low head with dyed red colourc) High lead, blue in colourd) High lead, red in colour

48. Additives are added to:a) To prevent microbiological growthb) To act as an antifreezec) To avoid detonationd) Both (a) & (b) are correct

49. For bending tubes of small diameter:a) Low melting point, fusible alloy & sand is usedb) Can be simply bended by bandc) Cannot be bended

50. When securing steel bolts in soft alloys:a) Zinc coating is usedb) Chromium coating is usedc) Cadmium plating is usedd) Nickel plating is used

51. Core of aluminum is used in electrical cables:a) Low resistivityb) Weight savingc) Temperature compensation

52. Self plugging rivets can:a) Replace solid rivet of same diameterb) Replace solid rivet, but one size largerc) Replace hollow rivetd) Cannot replace

53. Corrosion on Mg is cleaned by:a) Hydrochloric acid solutionb) Sulphuric acid solutionc) 10% by wt. of chromic acid + .1% H2SO4

54. What is difference between aluminum oxide & iron oxide:a) Iron oxide is porousb) Aluminum oxide is porousc) Aluminum oxide is non-porousd) As in (c) & it prevent further corrosion, once formed

55. Interior cleaning of a/c can be done by:a) Detergent & shop solutionb) Phosphoric acidc) Vacuum cleaner

56. Channel, angles & T-sections are:a) Extrudingb) Forgingc) Cold working

57. Heat treatment of Ti is done to:a) Relief of stressesb) To provide max ductility for subsequent cold workingc) Thermal hardeningd) All

58. If there is a lag between soaking & quenching:a) Repreapitation will occurb) Improve corrosion resistantc) Strengthens it

59. Temperature inside furnace is measured by:a) Pyrometerb) Thermocouplec) Thermometer

60. Boiling point varies:a) Directly with volumeb) Indirectly with pressurec) Directly with pressured) Indirectly with volume

61. If volume is doubled keeping temperature constant new pressure will be:a) Same as initialb) Twice of initialc) Half of initiald) Not affected

62. Forces acting on a/c are:a) Compression & gravityb) Lift, drag, gravity, brustc) Thrust, drag

63. Lift on can aerofoil varies with:a) Directly with area of surfaceb) Indirectly with area of surfacec) Not affected

64. If length of wire of heater is reduced its wattage rating will be:a) Remain sameb) Decreasesc) Increasesd) Unaffected

65. If n cells are connected in series with EMF E & internal surface P then voltage across N cells shown on voltmeter is:a) NEb) (N 1) Ec) ( N 1) / NE

66. Mark the correct statement:a) Rheostat has three terminalb) Potentiometer has three terminalc) As in (b) & has low resistance valued) Rheostat has two terminal & has low resistance value

67. Vicious cycle is related to:a) Generatorb) Motorc) Battery

68. If a/c Ni-Cd battery is to be stored for longer time:a) It should be fully charged & electrolyte is drainedb) It should be fully charged & discharged at 1 hr. ratec) As in (a) and terminals are cleaned properly

69. Which safely device take overload for a certain period:a) Fuseb) Current limiterc) Circuit breakerd) Thermal protector

70. Best suited meter for checking discontinuity is:a) Ammeterb) Voltmeterc) Ohmmeterd) Bonding tester

71. Ohms law is applicable to a.c. circuit for:a) Maximum voltage & currentb) Effective voltage & currentc) Instantaneous voltage & current

72. If an alternator has 4 poles, and 1800 rpm. frequency is:a) 60 cpsb) 120 cpsc) 100 cps

73. In an inductor circuit, current:a) Lag voltge by pie/2b) Lead voltage by pie/2c) Not affected

74. Charge stored in capacitor varies with:a) Directly with area & voltageb) Inversely with distance between platesc) Both

75. Capacitance is measured in:a) Farad & varies directly with areab) Microplaran & varies directly with dielectric strength of mediac) Picofarad & universally proportional to distance between platesd) All

76. If frequency of a transformer is charged from 50 to 60, voltage is secondary winding:a) Increases in ratio of 60/50b) Decreases in ratio of 50/60c) Unaffected

77. In a parallel inductor, capacitor resonant circuit:a) No current flowsb) Max. current flowc) Voltage is smalld) Zero resistance

78. For full power, full wave rectification:a) Two diode are usedb) 4 diodes are used in bridge circuitc) Either 2 or 4 diodes can be used

79. Which defect is not defected by radiography is composite material:a) Porosityb) Wide crackc) 11 to beamd) Defect perpendicular to beam

80. Structural grade kevlar is:a) Kevlar 49b) Kevlar 29c) Kevlar 129

81. For greater tensile & compressive load:a) Fibre glass sheet is usedb) Sandwitched structure with nomex skinc) Sandwitched structure with graphite skind) All

82. Oil & grease contamination on composite as detected by:a) Water break testb) Coin tap testc) Radiography

83. In silver brazing temperature is:a) 200C 400Cb) 350C 500Cc) 1000C 1200Cd) 500C 800C

84. In which type of brazing, localized heating is used:a) Resistance brazingb) Furnace brazingc) Induction brazing

85. Welding of crack is considered as:a) Butt jointb) Lap jointc) T joint86. Mark the correct statement:a) Spot welding is done by using 2 copper electrodesb) Seam welding is done by using copper rollersc) (a) & (b) & seam welding is continuous used

87. Flux is used in soft soldering:a) To prevent effect of oxidationb) To remove oxidec) To increase strengthd) All

88. Aluminum is welded using:a) Neutral & slightly carburizingb) Oxidizingc) Neutrald) Carburizing

89. Ultrasonic welding is used in:a) Ironb) Cotinc) Aluminumd) Honeycomb

90. In reciprocating engine, engine fires at:a) Every solutionb) Every second revolutionc) 360 rotation of crankshaft rotation

91. In tail wheel a/c, when nose is in direction of wind:a) Elevator is uplockedb) Elevator is locked in down positionc) Elevator is locked in neutral positiond) Any of above

92. Screw driver (common) must full the slot at least:a) 75%b) 25%c) 50%d) 100%

93. During hack sawing, speed of hack sawing should be:a) 50 60 strokesb) 100 120 strokesc) 80 90 strokesd) Any desired speed

94. While drilling:a) Hard metal should be drilled firstb) Soft metal should be drilled firstc) Any can be drilled firstd) As in (a) to prevent formation of egg beater first

95. All head less set screw should be tightened by using:a) Allen wrenchb) Box and wrenchc) Open and wrench

96. Least count of vernier is:a) One division of vernier divided by total vernier divisionb) One main scale division, length by total vernier divisionc) One division of main scale by total main scale divisiond) None

97. Back-last error is vernier micrometer:a) Manufacturing defectb) Wear between screw & nutc) Slippage between screw & nutd) All

98. Aviation snip is used for cutting:a) Heat treatable aluminum alloy & stainless steelb) Heavy sheetc) Mild steeld) All

99. Yellow is:a) Straight aviation snipb) Left hand snipc) Right hand snip

100. Hole to be reamed should be drilled:a) 0.003 0.007 undersizeb) 0.009 0.012 undersizec) 0.015 0.018 undersize