WorksheetsIGT PO3.1
Total questions: 17
Worksheet time: 16mins
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
What is the main function of bearing housing?
To reduce weight
To increase friction
To incorporate oil baffles
To provide support for the rotor
What type of bearing is used to support the turbine rotor weight?
Thrust Bearing
Tapered Land Bearing
Journal Bearing
Flat Land Bearing
What happens to the oil film pressure as the shaft speed increases?
It becomes unstable
It increases
It remains constant
It decreases
What is a common cause of discoloration and cracking of bearing surfaces?
Low lubrication temperature
High lubricating temperature
Excessive oil viscosity
Insufficient oil supply
What is the primary advantage of using hydrodynamic bearings in gas turbines?
Lower cost
Higher load capacity
Reduced friction
Increased wear resistance
What is the effect of oil viscosity on bearing performance?
Higher viscosity improves lubrication
Lower viscosity increases friction
Viscosity has no effect
Higher viscosity can lead to overheating
What maintenance practice is essential for prolonging bearing life?
Regular oil changes
Frequent cleaning of the housing
Monitoring temperature
All of the above
