Unit 17 - Chapter 69

Question 0

The stationary passage of reaction turbines is the

Answer 0

Fixed blade and nozzles

Question 1

A steam turbine’a exhaust can often supply a process with steam because

Answer 1

It is free of oil

Question 2

The great majority of steam turbine governors utilize the

Answer 2

Mechanical centrifugal principle

Question 3

The exhaust from a steam turbine is more acceptable for process than the exhaust from a steam engine because

Answer 3

It is free of oil

Question 4

The exhaust steam from a condensing steam turbine ___ than the exhaust from a steam engine

Answer 4

Has more moisture

Question 5

Turbines often have segmental carbon ring sealing glands which are held in place by

Answer 5

Garter springs

Question 6

A steam turbine should trip or shit down when normal operating speed is exceeded by

Answer 6

10 - 15%

Question 7

Condensing turbines

Answer 7

Will have a vacuum in the last row of rotating blades

Question 8

Which turbine uses a condenser?

Answer 8

A turbine exhausting to a vacuum

Question 9

The shrouding installed on the blading of a steam turbine serves to

Answer 9

Confine steam to the blades

Question 10

A turbine over speed trip

Answer 10

• prevents the turbine exceeding maximum rated speed
• will close the steam stop valve
• should be tested before the turbine is placed in service

Question 11

The over speed trip of a steam turbine

Answer 11

Is installed on all turbines

Question 12

Turbine overspeed trip

Answer 12

Will close the steam stop valve to the turbine

Question 13

Turbine lubricating oil

Answer 13

Can be used to operate the turbine governor

Question 14

The purpose of turbine glands is to prevent

Answer 14

Steam from escaping from the turbine

Question 15

Shaft sealing in high output turbines is done with

Answer 15

Labyrinth seals

Question 16

When the steam pressure drop occurs in only the stationary members or components of a turbine, the turbine is known as

Answer 16

An impulse unit

Question 17

A large reaction turbine will have

Answer 17

Steam pressure dropping through moving and stationary sections

Question 18

Turbine speed can be fine tunes to over 10% over the rated steam by using a

Answer 18

Hand speed control

Question 19

Turbine thrust bearings are fixed to the casing to prevent axial movement of the spindle by contracting a component on the shaft known as a

Answer 19

Collar

Question 20

Shaft sealing carbon glands are

Answer 20

Self lubricating

Question 21

Reaction turbines

Answer 21

Have a pressure drop through the moving and stationary blades

Question 22

Reaction turbines

Answer 22

Have a velocity increase in the fixed blading

Question 23

In an impulse turbine

Answer 23

The steam pressure is reduced in the nozzles

Question 24

The steam turbine that has a pressure drop across every set of blades is the ___ turbine

Answer 24

Reaction

Question 25

When starting a steam turbine it is customary practice to

Answer 25

Test the over speed trip as soon as running speed is attained

Question 26

In an impulse turbine, what prevents a pressure drop in the passage of steam through the blades?

Answer 26

The space between the blades

Question 27

Impulse turbines

Answer 27

Have no pressure drop through the moving blades

Question 28

The overspeed trip of a steam turbine

Answer 28

Is installed on all turbines

Question 29

In an impulse turbine, all of the steam pressure drop takes place in the

Answer 29

Stationary nozzles

Question 30

A turbine speed over trip

Answer 30

Trips the turbine is it is overloaded

Question 31

In theory, impulse turbines

Answer 31

Have no pressure drop through the moving blades

Question 32

The principle of an impulse turbine is that the

Answer 32

• steam pressure is reduced in the stationary nozzles

- high velocity steam will impinge upon the blades

Question 33

In a reaction turbine the steam pressure ___ in passing through moving blades, as well as the stationary nozzles or blades

Answer 33

Drops

Question 34

In a reaction steam turbine

Answer 34

Expansion takes place in the fixed and moving blades

Question 35

Two of the more important methods of classifying a steam turbine are by the stationary steam passages and the

Answer 35

Rotor flow passages

Question 36

Impulse and reaction are two different types of

Answer 36

Steam turbines

Question 37

The stationary passage of reaction turbines is the

Answer 37

Fixed blade

Question 38

Blades or ___ form the rotor flow passages in impulse turbines

Answer 38

Buckets