DGFCA AME EXAM

PAPER 3 [PISTON ENGINE] (JUNE-2013)

1. Power recovery turbine in reciprocating engine is coupled to the engine crankshaft througha) Mechanical couplingb) Slip couplingc) Fluid couplingd) Both b & c

2. The mass of air flowing through the carburetor is controlled by a) throttle valveb) venturec) metering jet

3. The propellers of aircraft powered by reciprocating engine accelerate a) a large mass of air through a small velocity changeb) A small mass of air through a large velocity change.c) Both a & b

4. Specific weight of an engine is the ratio of weight of an engine pera) Brake horse powerb) Thrust horse powerc) Indicated horse power

5. Specific weight of an engine is the ratio of weight of an engine pera) Brake horse powerb) Thrust horse powerc) Indicated horse power

6. Operating flexibility is the ability of an engine to run smoothly and give desired performance at all speeds froma) Idlingb) Idling to full powerc) Full power only

7. Slip stream effect of an propeller can be minimized bya) Increase in wash in on left sideb) Increase in wash out on right side

c) Off setting the fin d) All of the above

8. In plain type connecting rod at the crank pin end a) Single piece bushing is usedb) Two piece bushing is usedc) Bearing is used

9. Piston pin bore diameter is used by using a) Micrometerb) Telescoping gauge and micrometerc) DTI

10. In some reciprocating engine recess may be provided in the piston heada) To increase compressionb) For coolingc) To prevent interference with the valved) All of the above

11. Honing process is related with which component in piston enginea) Pistonb) Cylinderc) Valved) Crankshaft

12. Chrome plated cylinders are identified by a) Orange paintb) Blue paint

13. The clearance between the rocker arm face and the tip of the valve stem tip when the piston is on top dead centre of the power stroke and rocker arm is pressed against the push rod is called ( dale crane AMT 32)a) Valve lashb) Valve leadc) Valve lag

14. Hydraulic valve lifters used in reciprocating engine

a) Provides better lubrication to valve operating mechanismb) Requires the clearance adjustmentc) Eliminate the necessity of clearance adjustmentd) All of the above

15. V - 1710 indicatesa) V type engine use superchargingb) V type engine having 1710 piston displacement in cubic

inchesc) V type engine having 1710 piston displacement in cubic

centimeter

16. Plain bearings are generally used for thea) Cam ringb) Cam shaftc) Accessory drive shaftd) All of the above

17. When greater reduction in speed requires piston engine usea) Normal planetary reduction gearb) Reverse planetary reduction gearc) Both a & b d) None

18. In four stroke cycle five events are occurs in sequencea) Intake, compression, power, exhaustb) Intake, compression, ignition, power, exhaustc) Intake, exhaust, power, ignition, compression

19. The energy release cycle used by reciprocating engines is constant (Dale crane AMT 20 Q no. 2 on page-40)

a) Pressure cycleb) Volume cyclec) Temperature cycle

20. MTCS

a) Valve tappet converts the rotating motion of the crankshaft into the reciprocating motion of connecting rod.

b) Valve tappet convert the reciprocating motion of the piston into the rotating motion of crankshaft

c) Valve tappet convert the rotary motion of crankshaft into the reciprocating motion of camshaft

21. In four stroke cycle valve overlap occurs at the end of --------- and at the begging of ----------.

a) Exhaust, intakeb) Intake exhaustc) Intake compression

22. The piston displacement is obtained by multiplying total distance piston moves in a stroke to the

a) Area of cross section of cylinder boreb) Area of cross section of piston headc) Area of cross section of piston

23. T 310 T indicatea) Turbochargedb) Turbo-superchargedc) Tempered

24. Thermal efficiency isa) The ratio of heat energy of fuel it uses to the useful work done

by an engineb) The ratio of useful work done by an engine to the heat

energy of fuel it usesc) The ratio of break horse power to the indicated horse power

25. Mechanical efficiency is the ratio of break horse power to the a) Indicated horse powerb) Thrust horse powerc) Friction horse power

26. Air entering in the reciprocating engine is directed by a) Air inlateb) Carburetor

c) Throttled) Mixture control

27. The compression of intake air or fuel air mixture by the use of exhaust gases is known as

a) Superchargingb) Turbo superchargingc) Turbo chargers

28. The leaking intake pipes, restricted intake duct, and propeller unbalance will causes

a) Engine rough runsb) Low powerc) Engine vibrationd) All of the above

29. MTCSa) Waste gate collects and directs the exhaust gases on the

turbine wheelb) If the waste gate is fully closed all the exhaust gases are

directed outboardc) Waste gate controls the volume of exhaust gases

directed onto the turbine wheeld) All of the above

30. Engine surges due toa) Bootstrappingb) Waste gate malfunctionc) Controller malfunctiond) All of the above

31. The vapor lock in fuel is reduced by the use of a) Baffles in the tankb) Booster pumpc) Temp reducingd) All of the above

32. Mtcsa) High pressure fuel into low temperature fuelb) High temperature fuel into low pressure fuel

c) Both a & b d) None

33. MTCSa) A measure of economical use of fuel is called specific fuel

consumptionb) c)

34. The basic operating principle of most carburetors depends on the differential pressure between venture throat and

a) Out sideb) Insidec) Carburetor d) Air inlet

35. The power compensator system automatically increase the richness of mixture during

a) High power operationb) Sudden accelerationc) Idlingd) All speed above idling

36. In direct fuel injection system the fuel strainer used in which sectiona) Fuel injector sectionb) Fuel metering sectionc) Regulator section

37. Check and adjust the throttle control linkages so that spring back on the throttle quadrant in the aircraft is equal in both

a) Full openb) Full closedc) Both a & bd) Full rich and lean

38. In the magneto the one end winding is electrically grounded and the other connected to distributor block is called magneto winding

a) Primaryb) Secondaryc) Ground

d) P lead

39. The distributor rotates at what speed of the crankshafta) Halfb) One and halfc) Twice

40. Dual type magnetos are a) Base mounted b) Flange mountedc) Both a & b

41. Which type of magneto ignition system use transformera) Low tension b) High tensionc) Both a & bd) None

42. Which type of auxiliary ignition system change the DC of battery into pulsating DC

a) Impulse couplingb) Induction vibratorc) Booster coil

43. Impulse coupling mostly used in a) Radial engineb) Six cylinder opposed enginec) High power rated engined) Both b & c

44. MTCSa) Hot spark plugs will have short heat transfer pathb) Cold spark plug will have long heat transfer pathc) The choice of spark plugs to be used in a specific aircraft

is determined by the engine manufacturer.d) All of the above

45. Timing lights are used to determine the exact instant that the a) Magneto points are open b) Primary is grounded

c) Secondary is grounded

46. The internal timing of the magneto is a) Timing the magneto to the engineb) The adjustment of the breaker points of the magnetoc) Both a &b

47. Bench timing of the magneto usesa) Impulse couplingb) Induction vibratorc) Booster coil

48. When using the fuel of high tetraethyl lead content the fouling on sparkplug will be

a) Black in colourb) Green in colourc) Gray in colour

49. To avoid damage to the cylinder head spark plug openings are fitted with

(Dale crane AMT 57)a) Heli-coil bushingb) Heli-coil insertc) Bushing

50. Scavenge pump locationa) b) c)

51. Spar gear pump is a form of ( dale crane AMT 109)a) Variable delivery pumpb) Constant displacement pumpc)

52. Surge protection valve is associated with which system

a) Induction systemb) Lubrication systemc) Instrument systemd) Both a & b

53. Cylinder walls are lubricated bya) Splash oil by the connecting rodb) Sprayed oil by the crankshaft bearing holec) Both

54. MTCSa) Dry sump are suitable for inverted flightb) Wet sump engine having separate tankc)

55. When checking the low unmetered fuel pressure, the engine is operated at its

(Dale crane AMT 179 Q no. 93 page 181)a) Idle rpmb) Take off rpmc) Cruise rpm

56. Mostly used filtration system is (dale crane AMT 112)a) Full flowb) Partially flowc) Bypass flow

57. Detonation isa) Explosive burning of fuel air mixtureb) c)

58. The practical limit to the compression ratio an engine can tolerate is determined by which characteristics of fuel (dale crane AMT 41 Q no. 20)a) Flash pointb) Detonationc)

59. Cylinder cooling a) Fins b) Baffles c) cowlingd) All of the above

60. Thrust bending force is the thrust load tends to bend the blade in a) Opposite directionb) Forward directionc) Increased angle of attack positiond) Decreased angle of attack position

61. Aerodynamic unbalance of propeller blades is results when a) Thrust of blades is unequalb) Propeller blade elements not follow the same plane of rotationc) Center of gravity of the propeller does not coincide with the axis

of rotation

62. If the metal particles are found in oil a) Indication of engine failureb) Normal operationc) d)

63. A series of deep scratches caused by foreign particles between moving parts is calleda) Peeningb) Scoringc) Scratches

64. The greatest wear in the cylinder is a) At the top of the cylinderb) Near the top of the cylinderc) At the bottom of the cylinderd) None

65. Valve stretch a) Radius gaugeb) Micrometerc) Filler gauge

66. The difference between the angles the valve seat and the valve face are ground is (dale crane AMT 59)a) Interference angleb) Reference angle

c) Lapping angle

67. Creep marking is in between a) Glass and the caseb) Glass and the dezel c) d)

68. Fuel flow meter

a) Type of pressure gauge b) Measure the amount of fuel delivered to the carburetorc) Measure the pressure drop at the discharge nozzled) All of the above

69. In manifold pressure indicator the bellowsa) Expands at groundb) c) d)

70. Engine power is increased by increasinga) Cylinder volumeb) Engine powerc) Combustion pressure d) All of the above

71. Fast RPM drop is usually result of a) Faulty spark plugb) Incorrect ignition timingc) Both a & bd) None

72. Back firinga) Too lean mixtureb) Too lean mixture c) High idle RPMd) Low idle RPM

73. Auxiliary ignition system used in engine having

a) High tension ignitionb) Low tension ignition c) Both a & bd) none

74. Service bulletins

a) b) c) d) All of the above

75. Ignition off after

a) Idle cut offb) Fuel shut off valve offc) Engine being to be stopped d) All of the above

76. In fig show Ans - compression stroke

77. Oil control ring

78. Hot position

79. Bendix drive pinion

80. Long reach spark plug

81. NACA stands for (dale crane AMT 43)a) National aviation committee for aeronauticsb) National advisory committee for aeronauticsc) National American committee for aeronautics

82. On ground the position of the alternate air valve isa) Hotb) In betweenc) Cold

83. Engine mounting bolts in addition to weight of the engine are also subjected to

a) Tensionb) compressionc) Torsiond) Bending

84. MTCSa) Power stroke in four stroke engine occurs at every two

revolution of crankshaftb) Power stroke in four stroke engine occurs at every revolution

of crankshaftc) Power stroke in four stroke engine occurs twice a revolution of

crankshaftd) none

85. Icing tendency of carburetor is due to a) Discharge fuel at low pressure, the discharge nozzle

must be located at venture, and the throttle valve must be on engine side of the discharge nozzle

b) c)

86. MTCSa) When the waste gate is fully open all exhaust gases are

directed to turbine wheelb) When the waste gate is fully open all exhaust gases are

directed to overboard through tail pipec) Bothe a & b d) None

87. When a compression check is performed, a hissing sound at the breather is an indication air is leaking past the

a) Exhaust valveb) Intake valvec) Piston rings

88. When the carburetor heat valve is in cold position, the air that enters the engine is

a) Filtered b) Unfilteredc) Both a & bd) None

89. Throttle in a float type carburetor a) Regulates air flow to the engineb) Controls power outputc) Placed between venture and engined) All of the above

90. Which system is used during starting to produce a sparka) Primary ignition systemb) Secondary ignition systemc) Auxiliary ignition system

91. If the e-gap position is altered what will be the resulta) Weak sparkb) Timing order is changedc) No sparkd) All of the above

92.