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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
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