4.1 Steam Turbine Principles and Design

In a/an ______ turbine there is a difference in pressure across the _______ blades. Therefore the steam will tend to _____ around the periphery of the blades instead of passing through them.
1. impulse
2. moving
3. reaction
4. drip
5. stationary
6. Leak

A back-pressure turbine with exhaust steam going to an old boiler header that is supplying steam to an old lower pressure turbine is called a:

A back-pressure turbine with exhaust steam going to an old boiler header that is supplying steam to an old lower pressure turbine is called a :

In a condensing-bleeder turbine up to 2 percent of the total steam flow may be bled off. What is the bleed-steam used for?

In pressure compound steam turbines
1. The expansion of steam from boiler pressure to exhaust pressure is carried out in a number of steps or stages.
2. Each stage has a set of nozzles and a row of blades.
3. All of the velocity available is developed in one set of nozzles.
4. Rows of moving blades are separated by partitions or diaphragms into which nozzles have been installed.

The pressure at the outlet from the moving blades is the same as the pressure at the inlet to the moving blades in a/an ________ turbine

When the exit pressure of a steam turbine nozzle is less than ________ times the inlet pressure then a _______ nozzle will be used.

A thrust adjusting gear

In an impulse steam turbine nozzle the following events take place.
1. Steam pressure decreases.
2. Enthalpy of the steam decreases.
3. Velocity of the steam increases.
4. Volume of the steam increases.

In an impulse steam turbine nozzle the following events take place:
1. steam pressure decreases.
2. Enthalpy of the steam decreases
3. Velocity of the steam increases
4. volume of the steam increases

When disc rotors are assembled, the discs are heated until they are easily slid along the shaft and then located in the correct position on the shaft and shaft key. A small clearance between the discs prevents:

Proper expansion of steam through a turbine nozzle depends on what?
1. Operation at the design pressure
2. Operation at the design rotational speed
3. Operation at the design temperature
4. Selection of the proper nozzle material