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Paper- III (PISTON ENGINE)OCT- 2012 SESSION

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2012

Aviation World

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PISTON ENGINEOCT2012

1. When viewing engine from left & right side then from where we wil seea. Propeller end b. rear end c. accessory end d. both 2 & 3

2. Purpose of compressor ringa. To prevent oil from entering C.C.b. To prevent combustion gassesc. To prevent escape out of gassesd. All

3. Purpose of oil control ringa. Located above piston pin boss

4. Hydraulic valve tapet inspected ata. AT the time of overhaul

5. MTCS about Hydraulic valve tapet-a. Dont lubricate at the time of installation.

6. Hydraulic valve liftersa. Eleminate adjusting of clearences.

7. Aviation gasoline are identified by

a. Heat rangeb. Lead content TELc. Colourd. Both b & c

8. MTCSCounterweight used for static balancing.

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9. Spark plug used in yellow painted cylindera. Long reach (ENGINES WITH LONG REACH SPARK PLUGS ARE IDENTIFIED

BY YELLOW PAINT ON THE CYLINDER FINS BETWEEN THE SPARK PLUG HOLEAND THE ROCKER COVERS. ENGINES WITH SHORT REACH SPARK PLUGS

HAVE NO IDENTIFYING COLOR.)

b. Short reach

10.Cylinder head is made bya. Mg. alloyb. Al. alloy

11.

Sun gear is used ina. Spur planetaryb. Bevel planetaryc. Spur & piniond. Both 2 & 3

12.Cylinder fires inA. Every two revolution of crankshaftB. Every four revolution of crankshaft

13.Diagram of valveSemi tulip valve (FAA 12 A pn 21)

14.Flange type propeller shafta. Low powerb. High powerc. Medium powerd. Both a & c

15.Break Horse Power meansa. Actual power delivered to propeller

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16.Gasket asbestos used inAns Crankcase

17.Fuel or Liquid fires area. Class Bb. Class Ac. Class C

18.Purpose of waste gateAns To control volume of exhaust gases delivered to turbine

19.Cylinder wall is lubricated byA. Spray lubricated through connecting rod.

20.Other purpose of piston ringAns Transmit heat to cylinder wall

21.Altitude increases then what will be the effect on Fuel/Air mixturea. Richb. Leanc. No effect

22. Mixture control colourAns Red

23.Centrifugal force on fly weight is opposed bya. Oil pressureb. Mechanical linkagec. Aerodynamic force

24.Centrifugal force on propeller blade opposed bya. Thrust bending forceb. Torque bending force

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c. Aerodynamic twisting force

25.Thrust & radial loads are taken bya.

Plain bearingb. Ball bearing

c. Roller bearingd. Both 2 & 3

26.Greater capacity are taken bya. Plain bearingb. Taper bearingc. Roller bearing

27.Explosion of fuel/ air mixture causesa. Burningb. After burningc. Detonation

28.Carburetor heat operation on ground causesa. Pre ignitionb. Detonation

29.Which valve not used in basic fuel control unita. Idle needle valveb. Power enrichment valvec. Fuel regulating valved. Check valve

30.Viscosity is affected byAns Temperature

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31.Which units control the volume of airflowa. Throttle valveb. Butterfly valvec. Venturi

32.In idling systema. Air taken from main air bleedb. Air is not necessaryc. A separate air bleed is taken as a part of idling systemd. As in (a) & same as. (FAA 12 A pn120)

33.Engine rough run idlea. Air filter dirtyb. Restricted inletc. Hole in intake pipe

34.Mostly filter is usedAns Full flow type

35.When turn off the switcha. Secondary lead grounded firstb.

P lead grounded first

36.Visual inspection of Detonation is indicated bya. Cylinder base nut looseb. Discoloration

37. Thermocouple is installed ata. Exhaustb. Cockpitc. Hottest cylinder

38.Camshaft & crankshaft is connecteda. By gearing system

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b. Directly

39.Economy ignition is indicated byAns EGT40.Oil consumption is high reasona. Piston ring worn outb. Piston pin breakc. nta

41.Rocker arm is lubricated bya. Push rodb. Inner oil lines in cylinderc. Push rod housingd. All

42.Uneven compression is indicated bya. High CHTb. Rough idle speedc. Detonationd. Both a & c

43.Dirt in moisture causeAns Oil contamination (Delcrane)

44.Electrical tachometer hasa. Synchronous motorb. 3 phase synchronous motor

45.Oil temp. Bulb locateda. Crank caseb. Oil sumpc. Oil screen (in wet sump after oil cooler )

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46.Fire extinguisher suitable isAns Co

47.Direct cranking electrical starter usesa. Series wound motorb. Shunt wound motorc. Direct current series wound motor

48.Direct cranking electrical starterAns at rotor of synchronous motor

49.Pump used in piston enginea. Grotor pumpb. Positive displacement pump

50.To prevent Spark plug fouling & preignition which oil is useda. Vegatable oilb. A-D oil

51.Purpose of Automatic mixture controlAns. Keep fuel air mixture ratio as altitude changes

52.In normal aspirated engine manifold pressure isa. More than Barometric pressureb. Equal to Barometric pressurec. Not more than Barometric pressure

53.Piston pin boss is measured bya. DTIb. Telescoping gaugec. Telescoping gauge & micrometer

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54.Metal particles in oil found, indication ofAns. Internal failure of engine

55.Shorten V/v clearancea. Shorten V/v overlapb. Longer V/v overlapc. Insufficient v/v clearance

56.Manifold Pressure gauge indicatesa. Pressure at carburetorb. Pressure at intake manifold

57. Manifold pressure is the pressurea. After cylinderb. Combustion chamberc. Before cylinder

58.Manifold pressure measuresAns Absolute pressure

59.How are the teeth of the gears in the accessory section of engine normally lubricatedAns By splash or sprayed lubrication

60.Oil cooler is locatedAns Between scavenge pump & oil tank

61.Supercharger purposea. Increase the weight of airb. Increase the wt. of fuel/air charge

62.Induction viberator

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Ans Dc into pulsating ac

63.In diaphragm type pressure relief valve Oil warm P Increase Oil cold P decreaseAns. Oil tank vent clogged

64.Cooling in piston engine is done bya. Cowlingb. Bafflesc. d. All

65.Torque is measured bya. Prony brakeb. Dynamo meterc. Both

66.In ON- SPEED condition,governer flyweight is in which positiona. Outwardb. Inwardc. Neutral

67.Rated power meansAns operation at all apeeds

68.Same as 6769.Specific wt. of engine is

a. Wt. of engine/bhpb. Wt. of engine/thp

70.Two types of magneto timing area. Internal & externalb. Internal & to the engine

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c. External & to the engine

71.Magnetos are timed bya.

To the engineb. By C.B. operation

c. Both

72.Carbon fouling bya. Lean or rich mixtureb. Lead deposit excessivec. Excessive thread lubricantd. All

73.Fast rpm dropa. Faulty spark plugb. Fouled spark plugc. Both a & b

74.Internal combustion enginea. Changes heat energy to mechanicalb. Changes heat energy to kinetic energyc. Changes mechanical to heat energy

75.Thrust on propeller bladea. Perpendicular to plane of rotationb. Product of powerc. Parallel to plane of rotationd. Both b & c

76.Sludge chamber is associated witha. Camshaftb. Crankshaftc. Engine

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d. Propeller

77.Oil temp. bulb in dry sump lubrication system locateda. Engine side & internal lubrication systemb. Scavenge systemc. Inlet & engine side of the engine

78. Governer maintainsa. propeller rpm constantb. engine rpm constant

79.variable pitch propeller maintaina. engine speed constantb. propeller rpm constant

80.Stagered ignition is done fora. Dilution of fuel air mixture at exhaustb. To reduce vibration

81.In staggered ignition which spark plug fires firsta. First exhaust sideb. Both sidec. First intake side

82.

Idle cut off occurs,slight rise in rpm is indicatesa. Rich mixtureb. Lean mixturec. Normal mixture

83.Enrichment system is set for

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Ans delivery of rich mixture & maintain lean mix. At high altitude

84.Crack on cylinder head is indicated bya. Florescentb. Mpic. Magnifying glass 10X

85.Primary engine instrumenta. Tachometerb. Torquemeterc. CHT

86.Tachometer takes drive froma. Accessory sectionb. Crankshaft drive

87.Engine not attaining full power, failure ofAns. Leak in induction system

88.Valve operating mechanism of opposed engine is operated bya. Camshaftb. Camring

89.In diaphragm type pressure relief valve, as altitude increases P increases, as decreases Pdecreases then what will be the reason

Ans. Pressure relief valve not adjusted properly

90.Gear rotation of camshafta. Twice of crankshaft rotationb. Same as crackshaft

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91.E gap altereda. Ignition timing altered/changedb. No sparkc. Weak spark

92.Spark plug fouled resultsa. Engine stopb. Engine vibration

93.To increase engine powera. Volume of cylinderb. Combustion pressurec. Engine speedd. All

94.Propeller reduction gear systema. Increase powerb. Limit the propeller rpmc. Increase thrustd. Both a & b

95.Compression ratio isa. Ratio of BDC to TDCb. Ratio of TDC to BDC

96.Oil line separates thena. Oil is spills to overboardb. Oil is spills to enginec. Return to the tank or scavenge.

97.Thrust forcea. Bend the propeller blade outsideb. Bend the propeller blade forward

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98.Impulse coupling becomes straight after engine starting bya. Spring forceb. Centrifugal forcec. Both a & b

99.In opposed engine during startinga. Induction viberator is usedb. Impulse coupling is used

100. Cooling is done bya. Full rich mixtureb. Full lean mixture

cp- oct'12

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