WorksheetsPPS SEMI FINAL QUIZ 3.2B-3.2C
Total questions: 20
Worksheet time: 10mins
What is the primary role of extraction controllers in a steam power plant?
Set alarm limits
Adjust turbine speed
Control steam extraction for processes
Control steam admission
Why is balancing supply and demand of steam important in the function of admission controllers?
To prevent overload and optimize performance
For manual control of steam flow
To decrease turbine efficiency
To increase steam temperature
What is the main purpose of minimum and maximum override controllers?
Set speed limits for the turbine
Prevent steam extraction and admission rates from falling below or exceeding safe thresholds
Alert operators to pressure drops
Reduce system stability
Why is calibration important for extraction and admission controllers?
It ensures accurate and responsive control
It allows for more frequent alarms
It increases system pressure
It is only used during troubleshooting
Which feature allows automatic controllers to continuously adjust system parameters based on real-time data?
Override control
Feedback mechanisms
Auto-manual switch
Local control panel
What is the function of alarm systems in automatic extraction/admission controllers?
To control steam extraction
To switch controllers to manual mode
To trigger alerts when parameters deviate from set thresholds
To increase steam flow
Which of the following is a benefit of using automatic extraction and admission controllers?
Enhanced system reliability through consistent steam management
Higher extraction rates
Reduced training requirements for operators
Increased need for manual intervention
What is the function of the auto-manual switch on an extraction valve auto-manual station?
It locks the extraction valve
It increases steam flow automatically
It allows operators to toggle between automatic and manual control
It triggers system alarms
Why is training on the operation of auto-manual stations essential?
To reduce system efficiency
To ensure personnel can effectively manage steam flow and system integrity
To increase extraction rates
For system shutdown procedures
What information can be typically viewed on a local control panel in extraction valve auto-manual stations?
Valve positions, operational status, and any active alarms
Steam purity levels
Fuel supply levels
Weather conditions
What is the main purpose of the lubricating oil pressure alarm?
To monitor oil temperature
To prevent bearing damage by ensuring sufficient oil pressure
To detect oil contamination
To control oil viscosity
What is a possible cause for a lubricating oil temperature alarm indicating high temperature?
Blocked oil lines
Cold oil supply
Malfunctioning oil coolers
Low turbine load
When is the lubricating oil sump level alarm triggered?
When the oil temperature exceeds 65°C
When the sump is filled above the maximum level
When the oil level in the sump drops below the safe minimum level
When the oil pressure falls below 1.5 bar
What does a high differential pressure alarm across the oil filters indicate?
High oil temperature
Clogged filters due to contaminants
High oil viscosity
Low turbine load
Which of the following responses is appropriate if a bearing temperature alarm is triggered?
Increase turbine load
Inspect for bearing wear or misalignment
Recalibrate the oil sump level gauge
Replace the oil filter
What is the normal operating range for gland steam pressure in a turbine?
0.1 to 0.2 bar (g)
0.9 to 1.1 bar (g)
1.5 to 2.5 bar (g)
65°C to 85°C
Which condition is most likely to trigger a turbine vibration alarm?
Low lubricating oil pressure
Rotor imbalance
High gland steam pressure
Low sump oil level
What should be inspected if the main condenser vacuum alarm is triggered?
Oil pressure gauge
Condenser for leaks or air ingress
Bearing alignment
Gland steam pressure
Which issue might cause the main condenser condensate level alarm to activate?
Low gland steam pressure
High oil viscosity
Malfunctioning level control valves
Low turbine speed
What is the appropriate response to a turbine overspeed alarm?
Check the condensate level
Shut down the turbine immediately
Adjust the sump oil level
Increase gland steam pressure
