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! ! ! Set-1

Lubrication Systems

QuestionAnswer
1.In a reciprocating engine, oil is directed from the pressure relief valve to the inlet side of the a. pressure pump. b. scavenger pump. c. oil temperature regulator. a
2.The oil used in reciprocating engines has a relatively high viscosity due to a. the reduced ability of thin oils to maintain adequate film strength at altitude (reduced atmospheric pressure). b. large clearances and high operating temperatures. c. the relatively high rotational speeds. b
3.The time in seconds required for exactly 60 cubic centimeters of oil to flow through an accurately calibrated orifice at a specific temperature is recorded as a measurement of the oil's a. specific gravity. b. flash point. c. viscosity. c
4.What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine? a. Exhaust valves. b. Piston c. Crankshaft main bearings. b
5.Where is the oil temperature bulb located on a dry sump reciprocating engine? a. Oil cooler. b. Oil inlet line. c. Oil outlet line. b
6.Some larger reciprocating engines use a compensating oil pressure relief valve to a. compensate for changes in atmospheric pressure that accompany altitude changes. b. provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warms up. c. automatically keep oil pressure nearly the same whether the oil is warm or cold. b
7.In addition to lubricating (reducing friction between moving parts), engine oil performs what functions? 1. Cools. 2. Seals. 3. Cleans. 4. Prevents corrosion. 5. Cushions impact (shock) loads. a. 1, 2, 3, 4, 5. b. 1, 2, 3, 4. c. 1, 3, 4. a
8.Compared to reciprocating engine oils, the types of oils used in turbine engines a. are required to carry and disperse a higher level of combustion by-products. b. have less tendency to produce lacquer or coke. c. may permit a somewhat higher level of carbon formation in the engine. b
9.Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of a. mercury at a specific temperature. b. distilled water at a specific temperature. c. oil at a specific temperature. b
10.(1) Gas turbine and reciprocating engine oils can be mixed or used interchangeably. (2) Most gas turbine engine oils are Smei-synthetic.Regarding the above statements, a. neither No. 1 nor No. 2 is true. b. both No. 1 and No. 2 are true. c. only No. 2 is true. a
11.The oil dampened main bearing utilized in some turbine engines is used to a. dampen surges in oil pressure to the bearings. b. provide lubrication of bearings from the beginning of starting rotation until normal oil pressure is established. c. provide an oil film between the outer race and the bearing housing in order to reduce vibration tendencies in the rotor system, and to allow for slight misalignment. c
12.What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates? a. Oil will accumulate in the engine. b. The return oil will be pumped overboard. c. The scavenger return line check valve will close and force the oil to bypass directly to the intake side of the pressure pump. b
13.If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication? a. An oil that combines high viscosity and low demulsibility. b. An oil that combines a low viscosity index and a high neutralization number. c. The thinnest oil that will stay in place and maintain a reasonable film strength. c
14.The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits a. the oil tank to be vented through the normal engine vent. b. oil vapors from the engine to be condensed and drained into the oil supply tank. c. pressurization of the oil supply to prevent cavitation of the oil supply pump. a
15.Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their presence by a. disturbing the magnetic lines of flux around the detector tip. b. bridging the gap between the detector center (positive) electrode and the ground electrode. c. generating a small electric current that is caused by the particles being in contact with the dissimilar metal of the detector tip. b
16.Which of these characteristics is desirable in turbine engine oil? a. Low flash point. b. High volatility. c. High flash point. c
17.The valve assemblies of opposed reciprocating engines are lubricated by means of a a. pressure system. b. gravity feed system. c. splash and spray system. a
18.How are the teeth of the gears in the accessory section of an engine normally lubricated? a. By splashed or sprayed oil. b. By submerging the load-bearing portions in oil. c. By surrounding the load-bearing portions with baffles or housings within which oil pressure can be maintained. a
19.The viscosity of a liquid is a measure of its a. resistance to flow. b. weight, or density. c. rate of change of internal friction with change in temperature. a
20.Upon what quality or characteristic of a lubricating oil is its viscosity index based? a. Its resistance to flow at a standard temperature as compared to high grade paraffin-base oil at the same temperature. b. Its rate of change in viscosity with temperature change. c. Its rate of flow through an orifice at a standard temperature. b
21.How are the piston pins of most aircraft engines lubricated? a. By oil which is sprayed or thrown by the master or connecting rods. b. By the action of the oil control ring and the series of holes drilled in the ring groove directing oil to the pin and piston pin boss. c. By pressure oil through a drilled passageway in the heavy web portion of the connecting rod. a
22.Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to a. help dilute and neutralize any contaminants that may already be present in the engine's oil system. b. provide a better indication of any oil leaks in the system. c. prevent over-servicing. c
23.Which of the following is a function of the fuel-oil heat exchanger on a turbojet engine? a. Aerates the fuel. b. Emulsifies the oil. c. Increases fuel temperature. c.
24.What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines? a. Chemical stability. b. Friction resistance. c. Cooling ability. a
25.In a jet engine which uses a fuel-oil heat exchanger, the oil temperature is controlled by a thermostatic valve that regulates the flow of a. both fuel and oil through the heat exchanger. b. fuel through the heat exchanger. c. oil through the heat exchanger. c
Created by: sampizzuto
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