IGT PO3.1

What are the two types of journal bearings used on gas turbines?

• Elliptical and Three Lobes

• Flat and Tapered

• Hydrodynamic and Non-hydrodynamic

• Single and Double

What is the primary function of thrust bearings in gas turbines?

• To support radial loads

• To reduce friction

• To maintain rotor-to-stator axial position

• To provide lubrication

What is the purpose of the oil film in journal bearings?

• To cool the bearings

• To support the shaft and prevent metal-to-metal contact

• To increase friction

• To lubricate the rotor

How many thrust bearings are typically required in a gas turbine?

• One

• Two

• Three

• Four

What type of thrust bearing is capable of handling shaft and housing misalignment?

• Tapered Land

• Tilting Pad Non-Equalizing

• Flat Land

• Tilting Pad Self-Equalizing

What is a common issue that can cause scratches or scores on bearings?

• Low temperature

• Excessive lubrication

• High viscosity oil

• Lack of lubrication

What is the main construction material for bearing housing?

• Cast iron or cast steel

• Plastic

• Aluminum

• Copper

What type of thrust bearing is used for inactive applications?

• Tilting Pad Self-Equalizing

• Tilting Pad Non-Equalizing

• Tapered Land

• Flat Land

What is the purpose of the oil grooves in tapered land thrust bearings?

• To prevent overheating

• To support the rotor

• To increase friction

• To divide the bearing surface into pads

What can cause uneven wear on bearings?

• High lubrication temperature

• Vibration from misalignment

• Low shaft speed

• Excessive oil pressure