Power prep material

The two classifications of steam turbines include:

The two types of steam turbines include

Impulse turbine blades

Reaction turbine blades

The pressure remains constant across the moving blades of an impulse turbine

The force applied to the blade is caused by changing the direction of the stream flow in an impulse turbine

Steam pressure drops across the moving blades of an impulse turbine

In a reaction turbine the steam pressure drops in both the stationary and rotating blades

In a reaction turbine the steam expands in the moving blades producing a reaction force

In a reaction turbine the velocity of the steam decreases in the stationary and moving blades

In a reaction turbine blade clearance between the rotor and the casing must be kept at a maximum to prevent rubbing.

Nozzles are used on steam turbines to

The throttling effect of steam through a turbine nozzle

In which type of turbine does the steam pressure drop in the nozzle and then remain constant through both the stationary and moving blades:

Steam velocity, blade velocity may be reduced in a multistage impulse turbine by: 1. Reducing turbine vacuum 2. pressure compounding 3. increasing blading length 4. velocity compounding

Compounding steam turbines is used primarily to: 1. counteract axial thrust 2. reduce turbine rotor speed 3. Reduce friction losses 4. reduce turbine blade erosion 5. reduce turbine noise

A dummy piston with balance pipe is used primarily on reaction turbines to:

A turbine thrust bearing is typically lined with a soft metal known as

The purpose of a thrust bearing on a steam turbine is to: 1. Absorb rotor axial thrust 2. Reduce turbine vibration 3. Prevent steam leakage 4. Reduce steam velocity 5. keep the rotor in place within the casing

Different types of steam turbine plants may be classified as:

In addition to having a high thermal cycle efficiency, condensing steam plants have the following advantage.

This type of turbine acts like a pressure reducing valve.

This type of steam turbine has a better overall efficiency than a purely condensing steam turbine.

Another name for a condensing bleeder turbine would be referred to as

This type of turbine allows new high pressure boilers to provide steam to old lower pressure systems and could also be the back pressure turbine of a cross compound system

The purpose of a coupling on a turbine is to:

The following pump is utilized on a turbine rotor while on barring gear to prevent rubbing inside the bearings