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WorksheetsPPS SEMI FINAL QUIZ 3.2D-3.3
Total questions: 20
Worksheet time: 10mins
What is the primary purpose of an emergency shutdown (ETS) in a turbine power plant?
To speed up turbine operations
To immediately stop the flow of steam and prevent turbine damage
To increase power output
To reduce condenser vacuum
Which of the following conditions would NOT typically trigger an emergency shutdown?
High bearing temperature
Normal oil sump levels
Excessive turbine vibration
Fire in the turbine hall
What action should an operator take first when performing a manual turbine trip?
Check the rotor deceleration
Press the Emergency Stop Button
Start the post-trip cooling procedures
Engage the turning gear
What role does the turning gear play during an emergency shutdown procedure?
Stops steam flow immediately
Increases turbine speed
Ensures even cooling by slowly rotating the turbine rotor
Reduces lubricating oil temperature
Which component is responsible for instantly cutting off steam flow during a turbine emergency trip?
Turning gear
Oil sump
Trip valve
Condenser vacuum pump
If the condenser vacuum alarm is triggered, which response is most appropriate?
Decrease oil flow to bearings
Investigate for possible air ingress and cooling water issues
Activate the turning gear immediately
Increase turbine speed to compensate
Why is it important to monitor oil supply to bearings throughout the shutdown process?
To increase turbine speed
To prevent heat damage and ensure proper lubrication
To maintain steam flow
To reduce rotor deceleration
What should an operator do after the turbine has come to a complete stop?
Initiate post-trip cooling procedures
Restart the turbine
Manually open the steam stop valves
Increase generator output
After a turbine trip, which key information should be reviewed in the trip log to diagnose the cause?
Rotor speed only
Condenser vacuum levels only
System pressures, temperatures, and vibration levels
Oil color
Which of the following is NOT part of the post-shutdown inspection checklist?
Visual inspection of bearings
Reactivation of the Emergency Stop Button
Oil quality testing
Vibration analysis
Which material is commonly used for turbine blades due to its high-temperature strength and corrosion resistance?
Cast iron
Nickel-based superalloys
Babbitt metal
Graphite
What is the primary function of the turbine rotor?
To prevent steam leakage
To provide a casing for the turbine
To transfer mechanical energy to the generator
To regulate steam pressure
Which material is typically used for high-pressure turbine casings to withstand extreme internal pressures?
Stainless steel
Cr-Mo steel
Aluminum alloy
Babbitt metal
What is the purpose of gland seals in a steam turbine?
To control turbine speed
To support the rotor shaft
To direct steam to turbine blades
To prevent steam leakage and maintain vacuum conditions
Which device in the turbine system immediately stops steam flow during an emergency?
Governor
Gland seal
Emergency stop valve (trip valve)
Bearing
How does the overspeed trip mechanism protect the turbine?
It cuts off steam supply if the turbine speed exceeds a set limit.
It increases turbine speed in case of power demand
It reduces vibration by adjusting the rotor
It monitors the condenser vacuum levels
What is the main purpose of the throttle valve control?
To control the amount of steam entering the turbine
To prevent air ingress through the gland seals
To reduce turbine vibration
To monitor bearing temperature
Which control mechanism regulates steam flow to maintain a constant turbine speed during load fluctuations?
Throttle valve
Governor control system
Extraction steam control
Vibration monitoring system
What happens when the low lubricating oil pressure alarm is triggered?
The turbine increases speed
The turbine trips to prevent bearing damage
The emergency stop valve opens
The governor reduces steam flow
Automatic load shedding in a steam turbine is intended to...
Prevent steam leakage
Increase turbine output during emergencies
Reduce the load on the turbine during grid disturbances
Regulate condenser vacuum levels
