1) Main bearing oil seals used with turbine engines are usually what type(s)? Report

Teflon and synthetic rubber

Labyrinth and/or carbon rubbing

Labyrinth and/or silicone rubber

2) If, during inspection at engine overhaul, ball or roller bearings are found to have magnetism but otherwise have no defects, they Report

are in an acceptable service condition

must be degaussed before use

cannot be used again

3) A carbon seal has which type of sealing arrangement? Report

Full contact with race

Full contact with casing

Full contact with labyrinth

4) The highest turbine bearing temperature takes place Report

at start-up

at shut-down

all the time

5) Indentations on bearing races caused by high static loads are known as Report

galling

fretting

brinelling

6) The function of a labyrinth seal is to create Report

a restricted leakage of air between fixed and rotating components

an airtight seal between fixed and rotation components

an airtight seal between fixed adjacent casing surfaces

7) The bearings of a compressor rotor are usually Report

plain

sintered

ball and roller

8) Bearing seal failure would most probably cause Report

high oil temperature

high oil consumption

low oil pressure

9) Why are oil seals pressurised?. Report

To ensure minimum oil loss

To ensure oil is forced into the bearings

To ensure that the oil is prevented from leaving the bearing housing

10) What bearing is used to take axial loads on a main rotation shaft of a gas turbine engine? Report

Plain bearing

Roller bearing

Ball bearing

11) Seals on a gas turbine engine restrict leakage of oil by Report

spring pressure

air pressure

closely tolerated contacting components

12) An abradable lining in the fan case Report

prevents fan blade tip rub

provides acoustic medium

produces less leakage at tips for anti-ice

13) Squeeze film bearings are usually found on Report

H.P compressor section

LP compressor section

the turbine section

14) Taper roller bearings accept loads in which direction?. Report

Axial loads only

Radial and axial in both directions

Radial and axial in one direction only

15) Some labyrinth seals Report

control the outflow of air at the turbine

are self lubricating

are spring loaded

16) The purpose of 'squeeze film' type bearing is to Report

increase the flow of oil to the rolling element

minimise the effect of vibration

improve outer race cooling

17) In a jet engine the rotating assembly oil seals are maintained oil tight by means of Report

a garter seal

air pressure

an annular expander ring

EASA Questions Mod 15: Gas Turbine Engine Set 8: Bearing And Seals

Set 1: Fundamentals

Set 2: Engine Performance

Set 3: Engine Inlet

Set 4: Eng. compressors

Set 5: Combustion Section

Set 6: Turbine Section

Set 7: Engine Exhaust

Set 8: Bearing and Seals

Set 9: Lubricants and Fuel

Set 10: Lubrication system

Set 11: Fuel Systems

Set 12: Air Systems

Set 13: Ignition Systems

Set 14: Engine Indication

Set 15: Power Augmentation

Set 16:Turboprop engines

Set 17: Turboshaft

Set 18: APU

Set 19:Powerplant Installation

Set 20: Fire Protection

Set 21:Engine Monitoring

Set 22: Engine Storage