Unit 17 - Chapter 69 Flashcards

0
Q

The stationary passage of reaction turbines is the

A

Fixed blade and nozzles

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1
Q

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

A

It is free of oil

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2
Q

The great majority of steam turbine governors utilize the

A

Mechanical centrifugal principle

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3
Q

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

A

It is free of oil

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4
Q

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

A

Has more moisture

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5
Q

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

A

Garter springs

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6
Q

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

A

10 - 15%

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7
Q

Condensing turbines

A

Will have a vacuum in the last row of rotating blades

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8
Q

Which turbine uses a condenser?

A

A turbine exhausting to a vacuum

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9
Q

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

A

Confine steam to the blades

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10
Q

A turbine over speed trip

A
  • prevents the turbine exceeding maximum rated speed
  • will close the steam stop valve
  • should be tested before the turbine is placed in service
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11
Q

The over speed trip of a steam turbine

A

Is installed on all turbines

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12
Q

Turbine overspeed trip

A

Will close the steam stop valve to the turbine

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13
Q

Turbine lubricating oil

A

Can be used to operate the turbine governor

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14
Q

The purpose of turbine glands is to prevent

A

Steam from escaping from the turbine

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15
Q

Shaft sealing in high output turbines is done with

A

Labyrinth seals

16
Q

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

A

An impulse unit

17
Q

A large reaction turbine will have

A

Steam pressure dropping through moving and stationary sections

18
Q

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

A

Hand speed control

19
Q

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

20
Q

Shaft sealing carbon glands are

A

Self lubricating

21
Q

Reaction turbines

A

Have a pressure drop through the moving and stationary blades

22
Q

Reaction turbines

A

Have a velocity increase in the fixed blading

23
Q

In an impulse turbine

A

The steam pressure is reduced in the nozzles

24
The steam turbine that has a pressure drop across every set of blades is the ___ turbine
Reaction
25
When starting a steam turbine it is customary practice to
Test the over speed trip as soon as running speed is attained
26
In an impulse turbine, what prevents a pressure drop in the passage of steam through the blades?
The space between the blades
27
Impulse turbines
Have no pressure drop through the moving blades
28
The overspeed trip of a steam turbine
Is installed on all turbines
29
In an impulse turbine, all of the steam pressure drop takes place in the
Stationary nozzles
30
A turbine speed over trip
Trips the turbine is it is overloaded
31
In theory, impulse turbines
Have no pressure drop through the moving blades
32
The principle of an impulse turbine is that the
- steam pressure is reduced in the stationary nozzles | - high velocity steam will impinge upon the blades
33
In a reaction turbine the steam pressure ___ in passing through moving blades, as well as the stationary nozzles or blades
Drops
34
In a reaction steam turbine
Expansion takes place in the fixed and moving blades
35
Two of the more important methods of classifying a steam turbine are by the stationary steam passages and the
Rotor flow passages
36
Impulse and reaction are two different types of
Steam turbines
37
The stationary passage of reaction turbines is the
Fixed blade
38
Blades or ___ form the rotor flow passages in impulse turbines
Buckets