power prep Steam turbine Auxiliaries and Operation quiz

In a large steam turbine lubricating oil system the function of the oil is to lubricate and ___________ the bearings.

what type of instrumentation ins installed on the discharge side of an oil lubricated bearing

When a turbine is left cold and at a standstill, the weight of the rotor will tend to cause the rotor to sag slightly, this is also referred to as

when a hot turbine rotor has cooled at a standstill, the lower half will cool faster than the upper half. This may cause the rotor to bend upwards which may also be referred to as:

when a steam turbine is shut down it should be put on barring gear for a minimum of:

Barring gear shaft rotation is typically:

while large steam turbine is on barring gear what other system should be placed in service

which of the following is not a type of steam turbine governing:

Nozzle governing is utilized on __________ turbines

Nozzle governing

Impulse steam turbine speed can be controlled by throttling the steam supply through a control valve and:

Bypass governing allows

The difference between the no-load and full-load speed, expressed as a percentage of the set speed, is called the ______ of the governor. As the load increases, the speed will ________ below the set speed.

In a simple flyweight governor:

When a steam turbine exceeds its speed setpoint

Turbine lubricating oil

The turbine overspeed trip: 1. prevents the turbine from vibrating 2. prevents the turbine exceeding the maximum rated speed 3. is operated by a spring loaded pin in the rotating blades 4. will close the steam stop valve 5. should be tested before the turbine is placed in service

The overspeed trip of a steam turbine

Turbine overspeed trip

The great majority of steam turbine governing systems utilize

when starting a steam turbine it is customary practice to:

which of the following mechanisms would not be sued on an emergency overspeed trip device?

when starting up a cold steam turbine, what position should the main steam valve intitially be opened to?

when is the barring gear engaged on a large turbine during a shutdown

On shutting down a large steam turbine what is one of the first steps that an operator should do once the main steam valve is closed?

During the operation of a large steam turbine:

When a turbine hydraulic overspeed trip is activated 1. a spring closes the main steam valve 2. oil pressure quickly closes the main steam valve 3. the oil pilot drain closes 4. oil pressure to the valve is shut off 5. the stop valve oil cylinder drain is opened

Which of the following parameters are monitored and recorded during the operation on a steam turbine. 1. main steam pressure 2. main steam temperature 3. oil pressure and temperature 4. condenser vacuum 5. hotwell pressure and temperature

The internal spring loaded tripping bold has a center of gravity:

The overspeed trip on a steam turbine is typically set to operate at ______________ % overspeed

The purpose of a condenser is to:

The addition of a condenser to a steam turbine vs a turbine exhausting to atmosphere may increase the overall efficiency of the turbine by:

A surface condenser: (pick the incorrect answer)